Math Calculators
Percentages, averages, statistics, and everyday math made simple.
29 calculators
All calculators
- Percentage CalculatorSolve any percentage problem: find X% of a number, what percent one number is of another, or the percent change between two values.
- Percent Off CalculatorCalculate the sale price after a discount. Enter the original price and percent off to see the final price and how much you save.
- Average CalculatorCalculate the average (mean), median, sum, minimum, and maximum of a list of numbers. Paste or type values separated by commas or spaces.
- Standard Deviation CalculatorCalculate sample or population standard deviation, variance, and mean from a list of numbers.
- Ratio CalculatorSimplify a ratio to its lowest terms or solve a proportion for the missing value. Enter A:B to reduce it, or A:B = C:D with one blank to solve.
- Percent Error CalculatorCalculate percent error between an experimental and a true value, or percent difference between two measurements, with the working shown step by step.
- GCF & LCM CalculatorFind the greatest common factor and least common multiple of any list of numbers, with prime factorizations and the full list of common factors.
- Quadratic Formula CalculatorSolve any quadratic equation ax² + bx + c = 0 with real or complex roots, and get the discriminant, vertex, axis of symmetry, and factored form.
- Fraction CalculatorAdd, subtract, multiply, or divide two fractions and get an exact simplified answer, plus the mixed number, decimal, and percentage forms.
- Slope CalculatorFind the slope between two points along with the line's equation, intercepts, angle, length, midpoint, and perpendicular slope.
- Probability CalculatorCalculate the probability of two events happening together, either one happening, neither happening, and the chance of at least one success across repeated trials.
- Combinations & Permutations CalculatorCalculate nCr and nPr with and without repetition, plus factorials — and see exactly when order matters and when it does not.
- Statistics CalculatorGet the mean, median, mode, range, variance, standard deviation, and quartiles of a data set in one step, with the working shown.
- Z-Score CalculatorCalculate a z-score from a value, mean, and standard deviation, and convert it to a percentile and tail probabilities on the normal distribution.
- Logarithm CalculatorCalculate the logarithm of a number in any base, plus the natural log (ln) and common log (log₁₀), and go the other way with exponents.
- Percentage Change CalculatorFind the percentage increase or decrease between two numbers, with the exact change, the direction, and the multiplier — and see why a rise then an equal fall doesn't return you home.
- Exponent CalculatorRaise any base to any power — including negative, zero, and fractional exponents — and see the result with the rule that explains what the exponent means.
- Scientific Notation ConverterConvert any number to and from scientific notation, plus engineering notation and E-notation, with the order of magnitude and expanded standard form.
- Prime Number CalculatorCheck whether a number is prime, and get its prime factorization, number of divisors, and the nearest prime numbers above and below it.
- Square Root CalculatorFind the square root or any nth root of a number, with the simplified exact radical form, a perfect-power check, and the negative root for even roots.
- Proportion CalculatorSolve a proportion a/b = c/x for the missing value by cross multiplication, and check whether two ratios are equal — the maths of scaling and conversion.
- Sequence CalculatorFind the nth term and the sum of an arithmetic or geometric sequence from the first term, the common difference or ratio, and the number of terms.
- Modulo CalculatorCompute the remainder (modulo) and quotient of a division, with both the truncated and floored conventions shown so the negative-number cases are unambiguous.
- Rounding CalculatorRound a number to decimal places, significant figures, or the nearest multiple, with round-up and round-down shown alongside the standard rounded result.
- Factorial CalculatorCompute the factorial n! — the product of all integers up to n — with the number of digits and trailing zeros, for any n from 0 to 170.
- Confidence Interval CalculatorCalculate a confidence interval for a mean from the sample mean, standard deviation, and size, with the margin of error and standard error at your chosen confidence level.
- Sample Size CalculatorCalculate the survey sample size needed for a chosen margin of error and confidence level, with a finite-population correction for smaller populations.
- Linear Equation CalculatorFind the equation of a line through two points in slope-intercept form (y = mx + b), with the slope, x- and y-intercepts, and the line's angle.
- System of Equations CalculatorSolve a system of two linear equations in two variables (a₁x + b₁y = c₁, a₂x + b₂y = c₂) using Cramer's rule, with a diagnosis of no or infinite solutions.