Geometry

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.