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Free online statistics calculators. Fast, accurate, and always free to use.
Use our free mean calculator to find the arithmetic mean (average) of any set of numbers for statistics.
Use our free median calculator to find the median (middle value) of any set of numbers.
Use our free mode calculator to find the mode (most frequent value) of any set of numbers.
Use our free range calculator to find the statistical range (maximum minus minimum) of any set of numbers.
Use our free variance calculator to compute population or sample variance and standard deviation.
Use our free standard deviation calculator to compute population or sample standard deviation, variance, and mean for any data set.
Use our free quartile calculator to compute Q1, Q2 (median), Q3, interquartile range (IQR), and outlier detection fences.
Use our free percentile calculator to find the value at any percentile, or compute the percentile rank of a value in your data set.
Use our free z-score calculator to compute z-scores (standard scores) from raw values or find raw values from z-scores. Includes cumulative normal probability.
Use our free normal distribution calculator to find P(X < x), P(X > x), P(a < X < b), or find x for a given cumulative probability.
Use our free probability calculator to compute P(A), P(not A), P(A and B), P(A or B), and P(A|B) for independent events.
Use our free combination calculator to find nCr, the number of ways to choose r items from a set of n items without regard to order.
Use our free permutation calculator to find nPr, the number of ways to arrange r items selected from a set of n items where order matters.
Use our free binomial distribution calculator to find P(X=k), P(X≤k), and P(X≥k) with mean (np), variance (np(1-p)), and standard deviation.
Use our free Poisson distribution calculator to find P(X=k), P(X≤k), and P(X≥k) for a given rate λ with mean and variance.
Use our free correlation calculator to find the Pearson correlation coefficient r, r², covariance, and interpret the strength and direction of the linear relationship.
Use our free linear regression calculator to find the slope, y-intercept, r², and equation of the best-fit line y = mx + b.
Use our free confidence interval calculator to compute CI for a population mean (known or unknown σ) or proportion with any confidence level.
Use our free sample size calculator to find the minimum sample size required for your survey or experiment. Supports proportions and means.
Use our free random number generator to generate random integers or decimals in any range. Choose the count and whether numbers must be unique.
Addition, subtraction, multiplication, and division calculators.
Simplify, compare, and calculate with fractions.
Decimal conversion, rounding, and arithmetic calculators.
Calculate powers, square roots, and nth roots.
Solve equations, inequalities, and algebraic expressions.
Area, volume, perimeter, and shape calculators.
Sine, cosine, tangent, and trigonometric functions.
Prime numbers, factorization, factors, multiples, and LCM calculators.
Binary, decimal, and hexadecimal converters and arithmetic.
Arithmetic and geometric sequences and series.
Matrix operations, determinants, and inverses.
Derivatives, integrals, and limits calculators.
Complex number arithmetic and conversions.
Vector operations, eigenvalues, and linear systems.
Round numbers to specified precision and significant figures.
Odd math tools and general-purpose calculators.