Math Calculators

Calculate the area of rectangles, triangles, circles, trapezoids, sectors, ellipses and parallelograms from a few simple measurements.

Average eight values (0–100) with sum, median and highest/lowest rows for instant insight into your numbers.

Perform quick arithmetic — add, subtract, multiply, divide, or find the modulo remainder — between any two numbers in seconds.

Add, subtract, multiply and divide numbers up to 10^30 with exact and compact results. Fast arithmetic for very large values online.

Compute the diameter, circumference and area of a circle instantly from its radius.

Find the greatest common factor, common divisors, LCM and simplest ratio of any two numbers.

Compute a confidence interval for a sample mean from sample size, sample mean, standard deviation and confidence level, with margin of error and bounds.

Solve any exponential equation: enter two of base, exponent and result and compute the third, with the laws of exponents explained.

Add, subtract, multiply and divide two fractions with instant results reduced to simplest form, plus their decimal equivalent.

Find the greatest common factor, least common multiple and simplest ratio of any two numbers up to 10000.

Find the least common multiple and greatest common divisor of any two numbers up to 1000, with the exact integer result instantly.

Solve log_b(x) = y for any one of the base, the argument or the exponent, with common log, natural log and base conversion support.

Solve long division problems for free — enter dividend and divisor to get the integer quotient, the remainder and the exact decimal value.

Free basic math calculator for addition, subtraction, multiplication, division and modulo, with percentages, squares and more.

Add, multiply, or invert 2x2 matrices and compute the determinant in seconds — perfect for linear algebra homework and quick checks.

Calculates mean, average, median, mode and range of up to 10 numbers, instantly, with a data chart.

Find the nth term and the sum of the first n terms for arithmetic or geometric sequences, with the average term value and the common step.

Find the p-value for a z-score in two-tailed or one-tailed tests, with significance verdicts and critical values.

Compute the percent error between an observed measurement and an exact value, with signed error and absolute difference for accuracy checks in labs and quality control.

Quickly compute percentages, increases, and decreases.

Find the number of permutations (nPr) and combinations (nCr) for any n and r, with total arrangements and a handy outcome chart.

Find the smallest prime factor of any number up to 99,999, learn whether it is prime, and read an Euler totient estimate alongside the largest possible factor.

Analyze the prime factorization of any number up to 99,999: find the smallest and largest prime factors, the exponent of the smallest factor and the remaining cofactor.

Find P(A and B), P(A or B), complements and the exclusive-or for two independent events, shown as instant percentages.

Find the hypotenuse of a right triangle from its two legs, plus perimeter, area and angles. The classic a² + b² = c² in one click.

Solve ax² + bx + c = 0 with the quadratic formula: both real roots, the discriminant, and Vieta's sum and product of roots as built-in checks.

Simplify any ratio to its lowest terms and split any total amount between two parts. Great for recipes, mixing and sharing money.

Solve a right triangle from its two legs: hypotenuse, both angles, perimeter and area in one click.

Convert numbers to Roman numerals and back, 1 to 3999, with the digit breakdown, rules and date examples.

Free root calculator that finds square roots, cube roots, and any nth root of a number with instant results and verification.

Round any number to the desired decimal places under five standard modes: half up, half down, half to even, up or down, with whole-number and nearest-ten views.

Find the sample size needed for a survey from confidence level, margin of error and population proportion, or compute the margin of error for a given sample.

Evaluate trigonometric, logarithmic, exponential and power functions on any value, in degrees or radians, with instant results.

Convert between ordinary decimal numbers and scientific notation (m × 10ⁿ) instantly, in either direction.

Find the slope, rise, run and y-intercept of a line from two points. Instant results for ramps, roofs, roads and graph lines.

Find the mean, population and sample standard deviation, variance, range and median of six values from 0 to 100 in seconds.

Compute sum, mean, median, sample and population standard deviation, variance, min, max and range for up to 12 numeric values.

Find the surface area of a cube, cuboid, cylinder, sphere or cone from its dimensions, with lateral versus base area split plus volume.

Solve a triangle from three sides or a base and height: get the area, perimeter and all three angles instantly with Heron's formula and the law of cosines.

Calculate the volume of spheres, cones, cylinders, cubes, boxes, capsules, pyramids and ellipsoids from a few simple measurements.

Compute the z-score of a raw value from a mean and standard deviation, with exact probability below, above and within based on the normal distribution.