🧮 Math and Statistics Calculators

24 free math and statistics calculators. Ratios, fractions, averages, factors, rounding, quadratics and probability.

Ratio CalculatorSimplify a ratio, solve for a missing value in A : B = C : D, or split a total in a given ratio. Works with whole numbers and decimals.
Proportion CalculatorSolve a proportion a/b = c/d for the missing value by cross-multiplication. Enter any three of the four numbers.
Factor CalculatorFind all factors of a number, its factor pairs and its prime factorization. Also tells you whether the number is prime.
GCF Calculator (Greatest Common Factor)Find the greatest common factor of two or more numbers, with the Euclidean algorithm steps and prime factorizations. Also gives the LCM.
LCM Calculator (Least Common Multiple)Find the least common multiple of two or more numbers, with prime factorizations. Also gives the greatest common factor.
Rounding CalculatorRound a number to the nearest whole number, tenth, hundredth, thousandth, ten, hundred or thousand. Exact decimal rounding with no floating point errors.
Significant Figures CalculatorCount the significant figures in a number and round it to any number of significant figures, with scientific notation.
Modulo CalculatorCalculate a mod n, the remainder after division, with the quotient. Handles negative numbers under both the mathematical and programming conventions.
Long Division CalculatorDivide whole numbers and see every step of the long division, with the quotient, remainder, mixed number and decimal answer.
Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers. The answer is simplified and shown as a fraction, a mixed number and a decimal.
Simplify Fractions CalculatorReduce a fraction to its lowest terms and convert an improper fraction to a mixed number, with the greatest common factor used.
Decimal to Fraction CalculatorConvert a decimal to a fraction in lowest terms, or a fraction to a decimal. Exact conversion for terminating decimals.
Exponent CalculatorRaise a number to any power, including negative and fractional exponents. Gives exact answers for whole numbers and scientific notation for large results.
Quadratic Formula CalculatorSolve ax² + bx + c = 0 with the quadratic formula. Gives real or complex roots, the discriminant, the vertex and the steps.
Pythagorean Theorem CalculatorFind the missing side of a right triangle with the Pythagorean theorem. Also gives the area, perimeter and both acute angles.
Slope CalculatorFind the slope, angle, percent grade, distance and midpoint between two points, and the equation of the line through them.
Speed Distance Time CalculatorCalculate speed, distance or time from the other two. Works in mph, km/h, m/s and knots with any mix of units.
Average CalculatorCalculate the average (mean) of a list of numbers, with the sum, count, median, mode, range and geometric mean.
Median, Mode and Quartile CalculatorFind the median, mode, range, quartiles and interquartile range of a data set, with outlier fences and the sorted list.
Standard Deviation and Variance CalculatorCalculate sample and population standard deviation and variance for a data set, with the mean, sum of squares and standard error.
Weighted Average CalculatorCalculate a weighted average from values and their weights. Useful for grades, prices, ratings and any data where items count unequally.
Z-Score CalculatorCalculate a z-score from a value, mean and standard deviation, with the percentile and the normal distribution probabilities above, below and between.
Permutation and Combination CalculatorCalculate permutations (nPr) and combinations (nCr), with and without repetition, and factorials. Exact results for large numbers.
Sample Size CalculatorCalculate the survey sample size needed for a given confidence level and margin of error, with an optional finite population correction.

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