Math & Science

Free percentage calculator. Solve all three forms: X% of Y, X is what % of Y, and X is Y% of what. Updated 2026.

Free fraction calculator. Add, subtract, multiply or divide fractions and get simplified result + decimal equivalent. Updated 2026.

Free percent error calculator. Compute the absolute percent error between an experimental (measured) value and a theoretical (true) value. Updated 2026.

Free ratio calculator. Simplify any ratio to lowest terms, scale up or down, or solve A:B = C:? proportions. Updated 2026.

Free average calculator. Compute the arithmetic mean of any list of numbers — paste from spreadsheet or enter inline. Updated 2026.

Free calculator for mean, median, mode and range of any data set. Paste from spreadsheet or enter inline. Updated 2026.

Free circle calculator. Solve for radius, diameter, circumference and area from any one known measurement. Updated 2026.

Free area calculator. Compute the area of square, rectangle, circle, triangle, trapezoid, parallelogram, sector and more shapes. Updated 2026.

Free volume calculator. Compute volume of cube, sphere, cylinder, cone, pyramid, rectangular prism, and capsule. Updated 2026.

Free triangle solver. Compute all sides, angles, area, and perimeter from any valid combination of three known values. Updated 2026.

Free quadratic formula calculator. Solve any ax² + bx + c = 0 — real or complex roots, with discriminant and step-by-step. Updated 2026.

Free slope calculator. Compute slope, equation of the line, and angle between two points (x₁, y₁) and (x₂, y₂). Updated 2026.

Free distance calculator. Compute Euclidean distance between two points in 2D or 3D using the distance formula. Updated 2026.

Free Pythagorean theorem calculator. Solve for any side of a right triangle given the other two. Updated 2026.

Free right triangle calculator. Solve for all sides, angles and area from any two known values. Updated 2026.

Free standard deviation calculator. Compute population (σ) and sample (s) standard deviation, plus variance, mean, and range. Updated 2026.

Free exponent calculator. Compute base^exponent including negative, fractional, and decimal exponents — works for any real numbers. Updated 2026.

Free logarithm calculator. Compute log₁₀, ln (natural log), log₂, or log of any base — quickly and precisely. Updated 2026.

Free root calculator. Compute square root, cube root, and any n-th root of any number — including negative numbers (cube root only). Updated 2026.

Free random number generator. Generate one or many random numbers in any range — uses crypto.getRandomValues for true randomness. Updated 2026.

Free probability calculator. Compute single, combined (AND/OR), conditional, and complement probabilities for two events. Updated 2026.

Free z-score calculator. Compute z-score from value, mean, and standard deviation — plus probability from the normal CDF. Updated 2026.

Free confidence interval calculator. Compute the CI of a sample mean at any confidence level (90/95/99% etc.). Updated 2026.

Free p-value calculator. Compute p-value from a z-score for one-tailed (left/right) or two-tailed test. Updated 2026.

Free sample size calculator. Find the survey sample size needed for a target margin of error and confidence level. Updated 2026.

Free permutation and combination calculator. Compute nPr, nCr, and factorials for counting problems. Updated 2026.

Free GCF / GCD calculator. Find the greatest common factor of two or more numbers using the Euclidean algorithm. Updated 2026.

Free LCM calculator. Find the least common multiple of two or more integers — useful for fractions and scheduling. Updated 2026.

Free prime factorization calculator. Factor any positive integer into its prime factors with exponents. Updated 2026.

Free number sequence calculator. Generate arithmetic and geometric sequences, find n-th term and sum. Updated 2026.

Free scientific notation calculator. Convert between decimal and scientific notation, plus engineering notation and E-notation. Updated 2026.

Free rounding calculator. Round to decimal places, significant figures, or to the nearest integer / multiple. Updated 2026.

Free binary calculator. Add, subtract, multiply, divide binary numbers and convert to decimal, octal, hex. Updated 2026.

Free hex calculator. Add, subtract, multiply, divide hexadecimal and convert to decimal, octal, binary. Updated 2026.

Free half-life calculator. Solve for remaining quantity, half-life, decay constant, or elapsed time. Updated 2026.

Free surface area calculator. Compute surface area of cubes, prisms, spheres, cylinders, and cones. Updated 2026.

Free long division calculator. Divide whole numbers and see each subtraction step plus quotient and remainder. Updated 2026.

Free basic calculator with order of operations and percent support. Add, subtract, multiply, divide. Updated 2026.

Free big number calculator. Exact arithmetic on huge integers using BigInt — no rounding, no precision loss. Updated 2026.

Free statistics calculator. Mean, median, mode, range, variance, and standard deviation from any list of numbers. Updated 2026.

Free matrix calculator. Add, subtract, multiply matrices and compute determinant and transpose. Updated 2026.

Free modulo calculator. Compute the remainder a mod n for any integers, including negatives. Updated 2026.

Free factorial calculator. Compute n! exactly using BigInt — no overflow up to thousands of digits. Updated 2026.

Free mixed number calculator. Add, subtract, multiply, divide mixed numbers and convert to improper fractions. Updated 2026.

Free decimal to fraction calculator. Convert any decimal to a simplified fraction or mixed number. Updated 2026.

Free midpoint calculator. Compute the midpoint between two coordinates and the distance between them. Updated 2026.

Free perimeter calculator. Compute perimeter (or circumference) of squares, rectangles, circles, triangles, and parallelograms. Updated 2026.

Free trigonometry calculator. Compute sin, cos, tan, and their inverses in degrees or radians. Updated 2026.

Free exponential growth calculator. Project quantity over time at a constant growth rate. Updated 2026.

Free hours calculator. Find total hours and minutes between a start and end time, with optional break deduction. Updated 2026.