All Calculators

Loans, mortgages, savings, retirement, taxes — every financial calculator you need to make confident money decisions.

• Future Value Calculator

  Calculate the future value of a lump-sum deposit or a series of equal payments (annuity) at a given rate. See the FV formula and step-by-step math.

• Loan Payment Calculator

  Calculate your monthly loan payment instantly with our free online loan calculator. Supports custom principal, rate, and term inputs.

• Compound Interest Calculator

  Calculate compound interest and total balance for annual, quarterly, monthly, daily, or continuous compounding. See the formula and step-by-step math.

• Margin & Markup Calculator

  Calculate profit margin, markup, cost, revenue, and profit from any two known values. See exactly why margin and markup are never the same number.

• Present Value Calculator

  Calculate what a future lump sum or a series of equal payments (annuity) is worth today, discounted at a given rate. See the PV formula and steps.

• ROI Calculator (Return on Investment)

  Calculate ROI (Return on Investment) from cost and final value, then see the optional annualized ROI to compare investments over different holding periods.

• Simple Interest Calculator

  Calculate simple interest and total repayment instantly. Enter principal, rate, and time in years to see interest earned or owed, step by step.

Convert between decimals, fractions, percents and mixed numbers.

• Adding and Subtracting Fractions Calculator

  Add or subtract 2 to 10 fractions at once with the least common denominator (LCD) method, showing every conversion, reduction, and mixed-number step.

• Adding and Subtracting Integers Calculator

  Add and subtract positive and negative integers step by step, with the Keep-Change-Change rule for subtracting a negative and clear sign rules.

• Averaging Fractions Calculator

  Average 2 to 10 fractions, mixed numbers, whole numbers, or decimals at once with exact LCD arithmetic, showing every sum, reduction, and divide-by-n step.

• Circular Permutations Calculator

  Find the number of ways to arrange n distinct items around a circle — (n−1)! — with the fix-a-reference-point reasoning and a comparison to a straight line.

• Combinations Calculator (nCr)

  Calculate C(n,r), the number of unordered ways to choose r items from n, using nCr = n!/(r!(n−r)!), the nPr/r! relation, and the symmetry rule.

• Combinations with Replacement Calculator (CR)

  Calculate CR(n,r) = C(n+r−1,r), the number of unordered selections of r items from n types with repeats allowed, via stars and bars, steps shown.

• Common Factors Calculator

  Find every common factor shared by a list of whole numbers, plus the GCF, with a step-by-step divisor list for each value and their overlap.

• Comparing Fractions Calculator

  Compare two fractions, mixed numbers, or decimals to see which is less than, greater than, or equal — with LCD, decimal, and cross-multiplication methods shown.

• Complex Fraction Calculator

  Simplify a complex fraction (a/b)/(c/d) into a single fraction, step by step, using "keep, change, flip" and automatic mixed-number conversion.

• Decimal to Fraction Calculator

  Convert any decimal to a fraction or mixed number in lowest terms — including repeating decimals like 0.333… — with full step-by-step working.

• Decimal to Percent Converter

  Convert any decimal to a percentage instantly. Free, accurate, step-by-step decimal-to-percent calculator with worked examples and reverse conversion.

• Diamond Problem Solver

  Solve the diamond problem — enter two factors to get their product and sum, or enter a product and sum to find the two factors that multiply and add to them.

• Equivalent Fractions Calculator

  Find fractions equal in value to any fraction by multiplying the numerator and denominator by the same number, with 20 equivalents and every step shown.

• Discount Calculator

  Free discount calculator: enter any two of list price, sale price, and discount percent to find the third, plus the amount you save.

• Estimating Fractions Calculator (Sums & Differences)

  Estimate the sum or difference of two fractions or mixed numbers by rounding each to the nearest 0, 1/2, or 1 — then compare it with the exact answer.

• Even/Odd Permutations Calculator

  Split the n! permutations of n distinct items into even and odd classes — always exactly n!/2 each — with the transposition-parity reasoning and steps.

• Expanded Form Calculator (with Word Form)

  Write a number in expanded form three ways — notation, factors, and exponential — plus word form. Shows each digit times its place value, step by step.

• Factorial Calculator (n!)

  Calculate n factorial (n!) instantly with the full multiplication chain shown. Handles huge results in scientific notation and explains why 0! equals 1.

• Factoring Calculator

  Find every factor of a number — all divisors and factor pairs — with step-by-step trial division up to the square root. Negatives and primes handled.

• Fraction to Decimal Calculator

  Convert any fraction or mixed number to a decimal with step-by-step long division. Detects repeating decimals and shows them in bar notation.

• Fibonacci Sequence Calculator

  Generate the Fibonacci sequence, find F(n) instantly, and watch the ratio of consecutive terms converge toward the golden ratio φ ≈ 1.618.

• Fraction to Percent Calculator

  Convert any fraction or mixed number to a percentage with step-by-step working. Handles repeating decimals exactly with bar notation.

• Fractions Calculator

  Add, subtract, multiply, or divide two fractions with step-by-step cross-multiplication, automatic reduction, and mixed-number conversion.

• Fractions Number Line: Visualize Fractions on 0-1

  See fractions plotted on a number line from 0 to 1, one row per denominator, with equivalent fractions aligning vertically, plus a fraction highlighter.

• Fractions Table: Decimal & Percent Reference Chart

  Browse a fractions table from 1/2 up to 1/16, sorted by value, with each row's decimal, percent, and equivalent fractions — plus a fraction highlighter.

• GCF Calculator (Greatest Common Factor)

  Find the greatest common factor (GCF) of two or more numbers, explained three ways: prime factorization, listing divisors, and Euclid's algorithm.

• Golden Ratio Calculator — Solve for A, B, or A + B

  Calculate the golden ratio φ ≈ 1.618 from one value — the longer segment (A), shorter segment (B), or their sum (A+B) — with the other two and full steps.

• Improper Fraction to Mixed Number Calculator

  Convert any improper fraction to a mixed number in lowest terms with full step-by-step working. Supports negative fractions — exact BigInt math, no rounding.

• Lattice Multiplication Calculator

  Multiply numbers with the lattice (Gelosia) method — a grid of diagonally split cells summed along diagonals, shown step by step with the full lattice.

• LCD Calculator (Least Common Denominator)

  Find the least common denominator (LCD) of fractions, mixed numbers, and integers, then rewrite each one as an equivalent fraction over that LCD.

• LCM Calculator (Least Common Multiple)

  Find the least common multiple (LCM) of two or more numbers, explained three ways: prime factorization, the GCF formula, and listing multiples.

• Long Addition Calculator

  Add two or more whole numbers or decimals in columns with carrying, shown step by step — every place-value column, each carry, and the final sum.

• Long Division Calculator (with Remainders)

  Divide whole numbers with the long-division bracket, shown step by step — Divide, Multiply, Subtract, Bring down — with the quotient, remainder, and a check.

• Long Division with Decimals Calculator

  Divide numbers into decimal places with long division — move the decimal point, bring down zeros, and calculate to any place count (truncated, not rounded).

• Long Multiplication Calculator

  Multiply numbers with the standard algorithm, shown step by step — partial products, place-value shifts, decimal-point placement, and the sign rule.

• Long Subtraction Calculator (with Borrowing)

  Subtract numbers in columns with borrowing and regrouping, shown step by step — including chained borrows across zeros and a built-in addition check.

• Mixed Number to Decimal Calculator

  Convert any mixed number to a decimal with two solution methods and adjustable rounding. Step-by-step long division and improper-fraction breakdown.

• Mixed Number to Percent Calculator

  Convert any mixed number to a percent with two solution methods. Shows the decimal step, multiplies by 100, and rounds to your chosen precision.

• Mixed Numbers Calculator

  Add, subtract, multiply, or divide two mixed numbers, whole numbers, or fractions — see every improper-fraction step and the reduced, mixed-number answer.

• Mixed Number to Improper Fraction Calculator

  Convert any mixed number to an improper fraction with the formula (a×c+b)/c. Step-by-step solution, simplified form, and dozens of worked examples.

• Money Math Calculator

  Add, subtract, multiply, split, and stretch money to the cent. Column layouts for dollars-and-cents, even splits rounded down, and how many items a budget buys.

• Multifactorial Calculator (n!!, n!!!)

  Calculate the multifactorial n!!, n!!! or any step-k factorial, with the full multiplication chain shown. Clears up the classic n!! vs (n!)! mix-up.

• Modulo Calculator

  Compute a mod b — the remainder left over after dividing a by b — with the quotient, the check identity, and a step-by-step divisibility test shown.

• Multiples Calculator

  List the multiples of any positive integer, up to 1,000 at a time, optionally starting above a chosen minimum, with the formula shown step by step.

• Order of Operations Calculator (PEMDAS)

  Solve any expression in the correct order — PEMDAS / BODMAS — one step at a time. Supports exponents, roots, and three kinds of brackets.

• Ordering Fractions Calculator

  Arrange 2 to 15 fractions, mixed numbers, whole numbers, and decimals from least to greatest or greatest to least, with the LCD method shown step by step.

• Pascal's Triangle Generator

  Build Pascal's triangle row by row — every number is the sum of the two above it. See row sums, binomial coefficients, and the hidden diagonals explained.

• Percent Error Calculator

  Free percent error calculator. Compare an experimental (measured) value against a theoretical (actual) value, with step-by-step working.

• Percent to Decimal Converter

  Convert any percent to a decimal instantly. Free, step-by-step percent-to-decimal calculator with worked examples and reverse decimal-to-percent conversion.

• Percent to Fraction Calculator

  Convert any percent to a simplified fraction with a five-step working — including decimal percents like 12.5% and improper percents like 150%.

• Percentage Calculator

  Free percentage calculator for all three percent problems: find P% of a number, find what percent Y is of X, or find the whole number from a part and percent.

• Percentage Change Calculator

  Free percentage change calculator. Find the percent increase or decrease between an initial value and a new value, with step-by-step working.

• Percentage Difference Calculator

  Free percentage difference calculator. Compare two values with no before-or-after order and find the % difference relative to their average.

• Percentage Decrease Calculator

  Free percentage decrease calculator. Find how much a value shrank from a starting value to a final value, as a percent, with step-by-step working.

• Percentage Increase Calculator

  Free percentage increase calculator. Find how much a value grew from a starting value to a final value, as a percent, with step-by-step working.

• Permutations Calculator (nPr)

  Calculate P(n,r), the number of ordered arrangements of r items chosen from n, with the n!/(n−r)! formula, factorial cancellation, and step-by-step work shown.

• Permutations with Replacement Calculator (n^r)

  Calculate PR(n,r) = n^r, the number of ordered arrangements of r positions where each pick can repeat — PIN codes, passwords, license plates — with steps shown.

• Place Value Calculator

  Find the place value of every digit in a number — ones, tens, tenths, and beyond — with a digit-by-digit table, word form, and an addition check.

• Prime Factorization Calculator

  Break any integer into its prime factors by trial division, shown as a full division chain and in exponent form like 2² × 5².

• Prime Number Calculator

  Check whether any whole number is prime or composite using step-by-step square-root trial division, and see the nearest primes on either side of it.

• Ratio Calculator: Solve A : B = C : D

  Solve the missing term in a ratio proportion A:B = C:D by cross-multiplication. Enter three positive numbers and get the fourth, exact and step by step.

• Ratio Simplifier Calculator

  Simplify a ratio like A:B or A:B:C:D to its lowest integer terms — handles whole numbers, decimals, fractions, and mixed numbers, with full steps.

• Ratio to Fraction Calculator

  Convert a ratio A:B into a simplified fraction — pick part-to-part (find the whole by adding) or part-to-whole (B is already the whole) — with full steps.

• Roman Numeral Calculator (Convert and Calculate)

  Convert between Roman numerals and numbers, or add, subtract, multiply, and divide them. Shows the symbol breakdown and the classic Roman addition steps.

• Round to the Nearest Multiple Calculator

  Round any number to the nearest multiple — 5, 25, 0.05, a dozen — using round(x ÷ m) × m, shown step by step with the neighboring multiples.

• Rounding Methods Calculator (9 Methods)

  Compare all 9 rounding methods side by side — Half Up, Down, Even, Odd, Away, Toward, Ceiling, Floor, Random — and see how each handles an exact halfway value.

• Rounding Numbers Calculator

  Round a number to any place from millions to millionths, step by step. See the target digit, the deciding digit, and the direction, using Half Away From Zero.

• Sales Tax Calculator

  Free sales tax calculator: enter pre-tax price and tax rate to find the tax and total, or work backward to find the pre-tax price or rate.

• Scientific Notation Operations Calculator

  Add, subtract, multiply, and divide numbers in scientific notation step by step. Lines up exponents, normalizes the result, and shows every format.

• Scientific Notation Converter

  Convert any number to and from scientific notation, e-notation, engineering notation, order of magnitude, and word form — with the decimal-point steps.

• Significant Figures Calculator

  Add, subtract, multiply, or divide with significant figures. See each input's sig figs, the exact result, and the correctly rounded reported value.

• Simplifying Complex Fractions Calculator

  Simplify X/Y where X and Y can each be a whole number, fraction, mixed number, or decimal, with full "convert, multiply by the reciprocal" steps shown.

• Simplify Fractions Calculator

  Reduce any fraction to its lowest terms using the greatest common factor, convert improper results to a mixed number, and see every step worked out.

• Solve for X in a Proportion Calculator

  Solve the unknown x in a proportion like x/4 = 3/8 using cross-multiplication, with the exact fraction, mixed number, and decimal shown step by step.

• Speed Distance Time Calculator

  Solve for speed, distance, or time from the other two, step by step. Enter time as hours or hh:mm:ss, and see the formula triangle that links them.

• Standard Form Calculator

  Convert numbers to and from standard form (A × 10ⁿ) step by step. Standard form is the British term for scientific notation, keeping significant zeros.

• Unit Rate Calculator

  Find the unit rate — the amount per one unit — by dividing two quantities. See the ratio scaled to per 1 and the division, step by step, with worked examples.

• Tip Calculator

  Free tip calculator: enter the bill and a tip percent to get the tip amount, the total, and an even split per person for any size group.

• Vote Percentage Calculator

  Free vote percentage calculator: enter votes for up to 12 candidates, parties, or options and instantly see each one's exact share of the total vote.

Convert between hours, minutes, decimal time and military time.

Coming soon — tools in this category are on the way.

Mean, median, mode, standard deviation, and other statistics calculators for analyzing any data set.

• Descriptive Statistics Calculator

  Calculate every descriptive statistic for a data set at once: mean, median, mode, variance, standard deviation, skewness, kurtosis, and quartiles.

• Final Grade Calculator

  Find the score you need on your final exam to reach a target grade, given your current grade and how much the final is worth, with full steps.

• GPA Calculator

  Calculate your GPA from grade points and credit hours per course, with a full quality-points breakdown and step-by-step working shown.

• Grade Calculator

  Calculate a weighted grade from score and weight percentage rows, such as quizzes, projects, and exams, with a full contribution breakdown and steps shown.

• Mean, Median, Mode Calculator

  Find the mean, median, and mode of any data set instantly, with sum, count, min, max, and step-by-step working — plus when to trust each measure.

• Odds to Probability Calculator

  Convert odds A:B (wins to losses) into win and lose probabilities and percentages, reduced to simplest form, with step-by-step working.

• Percentile Calculator

  Find the value at any percentile using linear interpolation, or the reverse — the percentile rank of a value — with a full step-by-step breakdown.

• Quartile & IQR Calculator

  Find Q1, Q2 (median), Q3, and the interquartile range for any data set, plus min/max/range and the 1.5×IQR outlier fences, shown step by step.

• Standard Deviation Calculator

  Calculate variance and standard deviation for a data set — both population and sample versions — with sum of squares and step-by-step working.

• Z-Score Calculator

  Calculate a z-score — how many standard deviations a value or a sample mean sits from the mean — with the 68-95-99.7 empirical rule and step-by-step working.

Exponents, roots, polynomials, and equation solvers — the core algebra calculators for simplifying and solving expressions.

• Absolute Value Calculator

  Find the absolute value of any number, or the distance between two numbers, with exact step-by-step math and an answer that is never negative.

• Completing the Square Calculator

  Solve ax² + bx + c = 0 by completing the square. See the vertex form a(x − h)² + k, the 9-step method, and the exact roots with decimals.

• Cube Calculator

  Calculate x cubed (x³) for any integer, negative, or decimal number, with full step-by-step working and the sign rule for negative numbers explained.

• Cube Root Calculator

  Find the cube root of any number as an exact simplified radical (like 3∛2) plus a decimal value, including perfect cubes and negative inputs.

• Cubic Equation Calculator

  Solve any cubic equation ax³ + bx² + cx + d = 0. Get all three roots — real and complex — with steps, plus a Vieta's formulas check.

• Difference of Two Squares Calculator

  Factor a difference of two squares a² − b² into (a + b)(a − b). Enter the two square values to see the factored binomials and a step-by-step check.

• Dot Product Calculator

  Calculate the dot product of two vectors: multiply matching components, add the results, and see the exact scalar answer with full steps.

• Exponents Calculator

  Calculate x raised to the power n for any integer, negative, or decimal base, with full step-by-step working and the sign-trap explained.

• Fifth Root Calculator

  Find the fifth root of any number as an exact simplified radical (like 3⁵√2) plus a decimal value, including perfect fifth powers and negative inputs.

• FOIL Calculator

  Multiply two binomials (ax + b)(cx + d) with the FOIL method. See First, Outer, Inner, Last products, combined like terms, and the expanded polynomial.

• Fourth Root Calculator

  Find the fourth root of any number as an exact simplified radical (like 2⁴√3) plus a decimal value, including perfect fourth powers and negative inputs.

• Large Exponents Calculator

  Compute base raised to a huge exponent as an exact BigInt — every digit shown up to 10,000 digits, or scientific notation with the digit count beyond that.

• Logarithm Calculator (log base b of x)

  Calculate log base b of x for any positive value and base, including common (base 10), natural (base e), and binary (base 2) logs, with steps.

• Quadratic Formula Calculator

  Solve any quadratic equation ax² + bx + c = 0 with the quadratic formula. Get exact roots as simplified radicals or complex numbers, plus the discriminant.

• Fractional Exponents Calculator (Rational Exponents)

  Compute a fractional exponent x^(n/d) as an exact simplified radical plus a decimal approximation, bridging powers and roots with full step-by-step work.

• Radicals Calculator (Nth Root)

  Find the nth root of any number for a chosen index (2-20) as an exact simplified radical plus a decimal, including negative and imaginary results.

• Simplify Radicals Calculator

  Simplify y times the nth root of x into its exact reduced radical form with step-by-step prime factorization, including negative and imaginary results.

• Solve for Exponents Calculator (bⁿ = y)

  Solve b^n = y for the unknown exponent n given any positive base (other than 1) and positive result, using logarithms, with full steps shown.

• Square Calculator

  Calculate x squared (x²) for any integer, negative, or decimal number, with full step-by-step working and the sign rule for negative numbers explained.

• Square Root Calculator

  Find the square root of any number as an exact simplified radical (like 2√11) plus a decimal value, including perfect squares and negative inputs.

Distance, midpoint, slope, area, and other coordinate and plane geometry calculators for points, lines, and shapes.

• Annulus Calculator: Ring Area, Radii, Circumference

  Find the area, radii, and circumference of an annulus (ring) — the region between two concentric circles — from any two known measures, with exact steps.

• Capsule Calculator: Volume & Surface Area

  Find a capsule (pill shape)'s volume, surface area, and circumference from its radius and cylindrical body length — with exact step-by-step results.

• Circle Calculator: Radius, Diameter, Circumference, Area

  Find a circle's diameter, circumference, and area from any one known measure — radius, diameter, circumference, or area — with exact step-by-step results.

• Cone Calculator: Volume, Slant Height & Surface Area

  Find a cone's volume, slant height, lateral area, and total surface area from its radius plus height, slant, or volume — with exact step-by-step results.

• Conical Frustum Calculator: Volume & Surface Area

  Find a conical frustum's slant height, volume, lateral area, and total surface area from its two radii and height, with exact step-by-step results.

• Cylinder Calculator: Volume, Lateral & Total Surface Area

  Find a cylinder's volume, lateral (side) area, base area, and total surface area from its radius and height — with exact step-by-step results.

• Distance Between Two Points Calculator

  Find the exact distance between two points (x1,y1) and (x2,y2) on a coordinate plane using the Pythagorean theorem, with a simplified radical and decimal steps.

• Distance Between Two Points in 3D Calculator

  Find the exact distance between two points (x1,y1,z1) and (x2,y2,z2) in 3D space using the Pythagorean theorem twice, with simplified radical and decimal steps.

• Cube Calculator: Volume, Surface Area & Diagonals

  Find a cube's volume, surface area, face diagonal, and space diagonal from any one known measure — side, diagonal, area, or volume — with exact steps.

• Hemisphere Calculator: Volume, Surface Area & More

  Find a hemisphere's volume, curved (dome) surface area, base area, total surface area, and circumference from its radius — with exact step-by-step results.

• Equilateral Triangle Calculator: Area, Height, Perimeter

  Find an equilateral triangle's area, height, and perimeter from any one known measure — side, perimeter, semi-perimeter, area, or height — with exact results.

• Inverse Trig Functions Calculator (arcsin, arccos, arctan)

  Find the angle from a sin, cos, tan, cot, sec, or csc value — arcsin, arccos, arctan, arccot, arcsec, arccsc in degrees, radians, and exact π multiples.

• Isosceles Triangle Calculator: Area, Height, Angles

  Find an isosceles triangle's area, height, perimeter, and both base/apex angles from the two equal legs and the base — with exact simplified-radical results.

• Law of Cosines Calculator: SSS & SAS Triangle Solver

  Solve any triangle from three sides (SSS) or two sides and the included angle (SAS) using the law of cosines — get every side, angle, and the area.

• Law of Sines Calculator: Solve AAS, ASA & SSA Triangles

  Solve any triangle from two angles and a side (AAS/ASA) or two sides and a non-included angle (SSA) using the law of sines — includes the ambiguous SSA case.

• Midpoint Calculator

  Find the exact midpoint between two coordinates (x1,y1) and (x2,y2), or solve for a missing endpoint given one endpoint and the midpoint.

• Parallelogram Calculator: Area, Height, Diagonals

  Find a parallelogram's area from base and height, or its area, height, angles, and both diagonals from two sides and the included angle, step by step.

• Pyramid Frustum Calculator: Volume & Base Areas

  Find a square pyramid frustum's top area, bottom area, and volume from its top edge, bottom edge, and height, with exact step-by-step results.

• Rectangle Calculator: Area, Perimeter, Diagonal

  Find a rectangle's area, perimeter, and diagonal from two sides, an area, a perimeter, or a diagonal paired with one side — with exact step-by-step results.

• Rectangular Prism Calculator: Volume, Area & Diagonal

  Find a rectangular prism's volume, surface area, and space diagonal from length, width, and height — or solve backward from the volume, area, or diagonal.

• Regular Polygon Calculator: Side, Area, Angles

  Find the side, apothem, circumradius, area, and interior/exterior angles of any regular polygon (3 to 1000 sides) from just one known measure.

• Pythagorean Theorem Calculator: Hypotenuse or Leg

  Find a right triangle's hypotenuse from its two legs, or a missing leg from the hypotenuse and one leg — with exact simplified radicals and step-by-step work.

• Rhombus Calculator: Area, Diagonals, Perimeter

  Find a rhombus's area from side and height, both diagonals, or side and angle — plus perimeter, height, angles, and both diagonals, step by step.

• Right Triangle Calculator: Sides, Area, Angles

  Solve a right triangle from two legs or a leg and the hypotenuse — get the third side, perimeter, area, all three altitudes, and both acute angles.

• Slope Calculator

  Find the slope between two points (x1,y1) and (x2,y2) as an exact reduced fraction, plus point-slope, slope-intercept, and standard line equations.

• Sphere Calculator: Volume, Surface Area & Circumference

  Find a sphere's volume, surface area, and circumference from any one known measure — radius, volume, area, or circumference — with exact step-by-step results.

• Square Calculator: Area, Perimeter, Diagonal

  Find a square's area, perimeter, and diagonal from any one known measure — side, diagonal, perimeter, or area — with exact step-by-step results.

• Square Pyramid Calculator: Volume & Surface Area

  Find a square pyramid's volume, base area, slant height, lateral area, and total surface area from its base edge and height, with exact step-by-step results.

• Stadium Calculator: Area and Perimeter of a Pill Shape

  Find the area and perimeter of a stadium (pill/capsule) shape from its cap radius and rectangle length, or work backward from a known area or perimeter.

• Trapezoid Calculator: Area, Midsegment, Bases

  Find a trapezoid's area from both bases and height, or solve for the missing base or height from the area — plus the midsegment, step by step.

• Triangle Theorems Calculator: Solve Any Triangle (SSS–AAA)

  Solve any triangle from 3 known sides or angles — SSS, SAS, ASA, AAS, SSA, or AAA — and get every side, angle, area, perimeter, and radius.

• Triangular Prism Calculator: Volume & Surface Area

  Find a triangular prism's volume, lateral area, and total surface area from its base triangle's three sides and its length — with exact Heron-formula results.

• Trigonometric Functions Calculator (sin, cos, tan)

  Find sin, cos, tan, cot, sec, and csc for any angle in degrees, radians, or π multiples (e.g. 1/6 for π/6) — exact values for special angles.

• Trigonometric Ratios Calculator (SOH-CAH-TOA)

  Find all six trigonometric ratios — sine, cosine, tangent, cotangent, secant, and cosecant — from any two sides of a right triangle, plus the angle.

• Tube Calculator: Hollow Cylinder Volume & Area

  Find a tube's (hollow cylinder's) wall thickness, cross-section area, volume, and circumferences from its outer radius, inner radius, and height.

Physics and chemistry calculators — force, energy, motion, gas laws, wavelength, and molecular weight, solved for any variable.

• Average Velocity Displacement Calculator (s = ½(u+v)t)

  Solve s = ½(u + v)t for displacement, initial velocity, final velocity, or time using the average of the two velocities.

• Density Calculator (ρ = m/V)

  Calculate density from mass and volume using ρ = m/V, or rearrange to solve for mass or volume instead — with step-by-step working shown.

• Displacement Calculator (s = ut + ½at²)

  Solve the SUVAT equation s = ut + ½at² for displacement, initial velocity, acceleration, or time — with worked steps shown.

• Elastic Potential Energy Calculator (U = ½kx²)

  Solve the elastic potential energy formula U = ½kx² for energy, spring constant, or displacement. Enter any two values and get the third with steps.

• Final Velocity Calculator (v = u + at)

  Solve the kinematics equation v = u + at for final velocity, initial velocity, acceleration, or time — with step-by-step working shown.

• Force Calculator (F = ma)

  Solve Newton's second law F = ma for force, mass, or acceleration. Enter any two of the three values and get the third with step-by-step working shown.

• Friction Force Calculator (f = μN)

  Calculate kinetic friction force from the coefficient of friction and normal force using f = μN, or solve for either value instead.

• Hooke's Law Calculator (F = kx)

  Solve Hooke's law F = kx for spring force, spring constant, or displacement. Enter any two values and get the third with step-by-step working shown.

• Ideal Gas Law Calculator (PV = nRT)

  Solve the ideal gas law PV = nRT for pressure, volume, moles, or temperature. Enter any three values and get the fourth with step-by-step working.

• Impulse Calculator (J = Ft)

  Solve J = Ft for impulse, force, or time. Enter any two values and get the third instantly, with unit-labeled step-by-step working shown below.

• Impulse-Momentum Theorem Calculator

  Solve FΔt = mΔv for force, time interval, mass, or velocity change. Enter any three values and get the fourth with step-by-step working shown.

• Kinetic Energy Calculator (KE = ½mv²)

  Solve the kinetic energy formula KE = ½mv² for energy, mass, or velocity. Enter any two values and get the third with step-by-step working shown.

• Mass–Energy Equivalence Calculator (E = mc²)

  Solve Einstein's mass-energy equivalence formula E = mc² for energy or mass. Enter one value and get the other instantly, with the substitution step shown.

• Molecular Weight Calculator (Molar Mass)

  Calculate the molecular weight (molar mass) of any chemical formula, like H2O or Ca(OH)2, with a per-element mass breakdown and step-by-step working.

• Momentum Calculator (p = mv)

  Solve p = mv for momentum, mass, or velocity. Enter any two values and get the third instantly with unit-labeled, step-by-step working shown.

• Potential Energy Calculator (PE = mgh)

  Solve the gravitational potential energy formula PE = mgh for energy, mass, or height. Enter any two values and get the third with steps shown.

• Pressure Calculator (P = F/A)

  Solve P = F/A for pressure, force, or area. Enter any two values and get the third instantly, in pascals, with step-by-step working shown below.

• Velocity-Squared Calculator (v² = u² + 2as)

  Solve the SUVAT equation v² = u² + 2as for final velocity, initial velocity, acceleration, or displacement — no time needed.

• Wavelength Calculator (λ = v/f)

  Calculate wavelength from wave speed and frequency using λ = v/f, or solve for speed or frequency instead — with step-by-step working shown.

• Weight Calculator (W = mg)

  Calculate weight from mass using W = mg, or find mass from a known weight. Uses Earth's standard gravity g = 9.8 m/s² with step-by-step working.

• Work Calculator (W = Fs)

  Solve the physics work formula W = Fs for work, force, or distance. Enter any two values and the calculator solves the third with step-by-step working.

BMI, running pace, and target heart-rate calculators — quick screening estimates for everyday fitness and wellness.

• BMI Calculator

  Calculate Body Mass Index (BMI) from weight and height in metric or imperial units. See your WHO category and a step-by-step breakdown of the formula.

• Pace Calculator

  Calculate running pace and speed from distance and time. Leave one field blank and solve for it — pace in minutes per km or mile, speed in km/h or mph.

• Target Heart Rate Calculator

  Calculate your maximum heart rate (Fox or Tanaka formula) and five target training zones, using plain percent-of-max or the more personalized Karvonen method.

Convert temperature scales and units of length, mass, volume, area, time, and speed — fast, exact, client-side.

• Temperature Conversion Calculator

  Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur at once. See the from-Celsius formulas and a full step-by-step breakdown.

• Unit Converter — Length, Mass, Volume, Area, Time, Speed

  Convert between length, mass, volume, area, time, and speed units using dimensional analysis. See the conversion factor and a step-by-step breakdown.