Math

A free online basic calculator with a full on-screen keypad — addition, subtraction, multiplication, division, percent, parentheses, memory (M+/M-/MR/MC), and a running calculation history.

A free online big number calculator for exact arbitrary-precision arithmetic (add, subtract, multiply, divide, exponentiation) on integers far beyond JavaScript's safe-integer range, powered by native BigInt.

A comprehensive fraction calculator for addition, subtraction, multiplication, division, simplification, and conversions.

A free online long division calculator that shows the quotient, remainder, and a full step-by-step long division work grid — with an option to continue dividing into decimal places instead of stopping at the remainder.

Free percent error calculator. Find the percent, signed, and absolute error between an experimental (measured) value and a theoretical (accepted) value.

A free online percentage calculator with four modes: X% of Y, X is what % of Y, percent increase/decrease from X to Y, and X plus or minus Y%.

A free online ratio calculator that simplifies a ratio to lowest terms, solves a proportion for a missing term, and scales a ratio by a factor or to a target total.

A free online rounding calculator that rounds any number to a chosen number of decimal places or to the nearest ten, hundred, or thousand, with five rounding modes: half up, half down, ceiling, floor, and half to even.

A free online scientific calculator with trigonometry (sin, cos, tan), degrees/radians toggle, logarithms, powers, roots, factorial, π and e constants, parentheses, and memory keys.

A free online binary calculator for arithmetic (add, subtract, multiply, divide) and bitwise (AND, OR, XOR, NOT, shift) operations on binary numbers, with the decimal equivalent shown alongside every result.

A free online exponent calculator that computes b^n for integer, decimal, and negative exponents, and shows the expanded multiplication form for small integer exponents.

A free online factor calculator that lists every factor (divisor) of a positive integer, along with its factor pairs — and tells you instantly whether the number is prime or composite.

A free online Greatest Common Factor (GCF / GCD) calculator for two or more numbers, showing the full Euclidean algorithm trace as step-by-step work.

Free half-life calculator for radioactive/exponential decay. Solve for remaining quantity, initial quantity, elapsed time, or half-life itself using N = N0 * (1/2)^(t / half-life).

A free online hexadecimal calculator for arithmetic (add, subtract, multiply, divide) and bitwise (AND, OR, XOR, NOT, shift) operations on hex numbers, with the decimal equivalent shown alongside every result.

A free online Least Common Multiple (LCM) calculator for two or more numbers, showing the full prime factorization method as step-by-step work.

A free online logarithm calculator that finds log base b of x, with dedicated common log (base 10) and natural log (base e) shortcuts, showing the full change-of-base work.

A free online matrix calculator for addition, subtraction, and multiplication of two matrices, plus determinant, inverse, and transpose of a single matrix, with a dynamically sized grid up to 4x4.

Free number sequence calculator. Solve for the nth term and sum of an arithmetic or geometric sequence, or auto-detect the sequence type and constant from a list of terms.

A free online prime factorization calculator that breaks any whole number down into its prime factors, shown both as a step-by-step factor list and in compact exponent notation (e.g. 360 = 2³ × 3² × 5).

A free online quadratic formula calculator that solves ax² + bx + c = 0, showing the discriminant, root classification, real or complex roots, vertex, and axis of symmetry.

Free random number generator. Generate a list of cryptographically random integers or decimals within a custom min/max range, with options for unique values and sort order.

A free online root calculator for square roots, cube roots, and arbitrary nth roots — handles negative numbers correctly under odd roots and shows simplified radical form for square roots of positive integers.

A free online scientific notation calculator that converts standard numbers to and from scientific notation, and performs addition, subtraction, multiplication, and division on numbers already in scientific notation.

A free, quick-use area calculator for 7 common 2D shapes — square, rectangle, triangle, circle, trapezoid, parallelogram, and ellipse. One simple formula per shape; for a deep, dedicated circle solver, use the Circle Calculator instead.

A free, deep circle calculator that derives radius, diameter, circumference, and area from any one known value, plus a bonus arc length and sector area solver for a given central angle.

Free distance calculator. Find the distance between two points in 2D or 3D space, plus the midpoint for 2D coordinates, using the Pythagorean-derived distance formula.

A free online Pythagorean theorem calculator that solves for a missing leg or hypotenuse of a right triangle given the other two sides, using a² + b² = c².

A free online right triangle calculator that solves every side (a, b, c), both acute angles, area, and perimeter from any two known values — a fuller solver than a basic Pythagorean theorem calculator.

A free online slope calculator that finds the slope, slope-intercept equation, distance, and midpoint between two points on a coordinate plane.

Free online surface area calculator for cubes, rectangular prisms, spheres, cylinders, and cones. Enter your dimensions to instantly find the total surface area.

A free online triangle calculator that solves any general (non-right) triangle from SSS, SAS, ASA, or AAS inputs using the Law of Cosines, Law of Sines, and Heron's formula.

Free online volume calculator for cubes, rectangular prisms, spheres, cylinders, and cones. Enter your dimensions to instantly find the total volume.

A free online average calculator that finds the mean, sum, count, minimum, and maximum of a variable-length list of numbers — add or remove rows as needed.

Free confidence interval calculator for a population mean, using sample mean, sample standard deviation, sample size, and a 90%, 95%, or 99% confidence level with standard z-critical values.

Free calculator that finds the mean, median, mode(s), range, sum, and count of a variable-length list of numbers — handles no-mode and multi-modal data sets automatically.

Free p-value calculator. Compute a p-value from a z-score or a t-score (with degrees of freedom), one-tailed or two-tailed, using the standard normal and Student's t distributions.

Free permutation (nPr) and combination (nCr) calculator with the full factorial-based formula breakdown, guarding against r > n, negative inputs, and non-integers.

Free probability calculator for single events, two independent events (AND/OR), complements, and combinatorial (n choose k) probability without replacement.

Free sample size calculator for surveys and studies. Find the required sample size from a confidence level, margin of error, and an estimated proportion or standard deviation, with optional finite population correction.

Free standard deviation calculator that finds population and sample standard deviation and variance from a variable-length list of numbers, with a step-by-step deviation-squared breakdown.

Free all-in-one statistics calculator: mean, median, mode, range, variance, standard deviation (population & sample), quartiles, IQR, sum, count, min, and max from a single list of numbers.

Free z-score calculator: find z from a value, mean, and standard deviation, solve for x in reverse, and get the percentile/area under the standard normal curve.

Free chronological age calculator. Find your exact age in years, months, and days from any birth date, with automatic leap year handling.

Find the number of years, months, weeks, and days between dates, or add/subtract time from a specific date.

Calculate your Semester and Cumulative GPA easily with our interactive tool. Plan your future grades and reach your academic goals.

Free grade calculator: find your weighted course grade and the score you need on your final exam to hit any target grade.

Add or subtract time values, compute time offsets from dates, and parse complex time expressions.