About this collection
Deterministic formula-based calculators spanning everyday math and statistics. 31 free tools.
Math & Statistics
Deterministic formula-based calculators spanning everyday math and statistics.
Percentage Calculator
Calculate a percentage of a value, percentage change and one value as a percentage of another.
Increase / Discount Calculator
Apply a percentage increase or discount and calculate the new amount.
Ratio Calculator
Simplify the ratio of two values and calculate their relative percentages.
Average & Statistics
Calculate average, median, sum, minimum and maximum for a list of numbers.
Random Number Generator
Generate cryptographically strong random integers within a range.
Calculator
Run basic arithmetic, percentages and parenthesized calculations.
Fraction Calculator
Add, subtract, multiply or divide two fractions and simplify the result.
Percentage Difference
Calculate the symmetric percentage difference between two values.
Percentage Error
Calculate percentage error between measured and actual values.
Weighted Average
Calculate a weighted average from values and weights.
Standard Deviation
Calculate sample or population standard deviation for a list of numbers.
Variance Calculator
Calculate sample or population variance for a list of numbers.
Z-Score Calculator
Find how many standard deviations a value is from the mean.
Factorial Calculator
Calculate factorials for integers from 0 to 170.
Combination & Permutation
Calculate nCr and nPr on one screen.
GCD & LCM
Find the GCD and LCM of two integers.
Prime Factorization
Factor a positive integer into prime factors.
Quadratic Equation
Solve ax² + bx + c = 0 and calculate its discriminant.
Scientific Notation
Convert numbers to and from scientific notation.
Significant Figures
Round a number to a selected number of significant figures.
Logarithm Calculator
Calculate the logarithm of a number in any valid base.
Power & Root Calculator
Calculate powers and nth roots.
Trip Fuel Cost Calculator
Calculate trip fuel consumption and cost from distance, vehicle economy and fuel price.
Mean, Median, Mode & Range
Calculate mean, median, mode, minimum, maximum and range for a list of numbers.
Sample Size Calculator
Calculate a basic sample size for estimating a proportion from confidence level, margin of error and expected proportion.
Confidence Interval Calculator
Calculate an approximate confidence interval from mean, standard deviation, sample size and z value.
Probability Calculator
Calculate simple probability and its complement from favorable and total outcomes.
Rounding Calculator
Round a number to selected decimal places and also see floor/ceiling-style decimal rounding.
Modulo Calculator
Calculate quotient and remainder/modulo for a dividend and divisor.
Linear Interpolation Calculator
Calculate an interpolated y value between two points for a given x.
2×2 Matrix Calculator
Add, subtract and multiply two 2×2 matrices and calculate determinants.