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.

Convert decimals to fractions and fractions to decimals exactly, including repeating decimals like 0.(3) = 1/3. Get the reduced fraction, mixed number and the closest simple fraction. Free.

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.

Count the significant figures in any number and round to a chosen number of sig figs. Handles leading and trailing zeros, decimal points and scientific notation. Free and exact.

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.

Free complex number calculator. Add, subtract, multiply and divide complex numbers, raise to a power, find all n-th roots, and convert between rectangular, polar and exponential form with modulus and argument.

Free derivative calculator. Differentiate polynomials, trigonometric, exponential and logarithmic functions symbolically, get the second and third derivative, the value at a point and the tangent line.

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.

Calculate the exact factorial n! for any whole number up to 10,000. Also shows the number of digits, trailing zeros, scientific notation and the double factorial n!!. Free and instant.

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 online graphing calculator. Plot up to three functions of x, pan and zoom the graph, and get the roots, y-intercepts, intersections and a table of values. Runs in your browser.

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.

Calculate a mod n with negative numbers and decimals, and see truncated, floored and Euclidean remainders side by side. Also modular exponentiation (aᵇ mod n) and modular inverse. Exact and free.

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.

Free polynomial root solver for cubic, quartic, quintic and sextic equations. Finds every real and complex root, shows repeated roots and gives exact values for rational roots.

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).

Check whether a number is prime, get its full prime factorization, divisor count and sum, and find the next and previous prime. Or list all primes in a range. Handles very large numbers. Free.

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.

Solve systems of linear equations with 2, 3 or 4 unknowns. Get exact fraction answers, the determinant, and a clear verdict of one solution, no solution, or infinitely many. Free.

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 coordinate converter. Convert between Cartesian and polar coordinates in 2D, and between Cartesian, cylindrical and spherical coordinates in 3D, with angles in degrees or radians.

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.

Calculate sin, cos, tan, csc, sec and cot for any angle in degrees, radians or gradians, see exact values like √3/2 at 30° multiples, and find angles with asin, acos and atan. Free.

Calculate the sum, difference, dot product, cross product, magnitudes, unit vectors, angle and projection of two 2D or 3D vectors. Detects perpendicular and parallel vectors. Free.

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.

Calculate binomial probabilities: exactly k successes, at most, fewer than, at least or more than k, and a range. Also mean, variance, standard deviation and a bar chart. Accurate for n up to 100,000. Free.

Free chi-square calculator. Run a goodness-of-fit test against equal or expected frequencies, or a test of independence on a contingency table, with the chi-square statistic, p-value, critical value, Cramér's V and expected counts.

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.

Paste x and y data to get the least-squares regression line, slope, intercept, correlation r, R², standard errors and predictions, with a scatter plot of the fit. Free and private.

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 Poisson distribution calculator. Enter the average rate λ and a count k to get P(X = k), P(X ≤ k), P(X ≥ k), range probabilities, the mean, standard deviation and a probability chart.

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.

Run a one-sample, two-sample (Welch or pooled) or paired t-test on your data. Get the t statistic, degrees of freedom, exact p-value, confidence interval, effect size and a plain-English decision. Free.

Calculate a weighted average from any number of values and weights, see each item's share and contribution, and find what score the next item needs to reach a target average. Free.

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.

Calculate your exact chronological age from any birth date. Get a precise breakdown in years, months, and days — with leap-year handling, future date projections, and no sign-up required.

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.