Statistics

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.