📐 Free Online Math Tools
Free online math calculators — square root, exponents, factorial, prime checker, LCM & GCD, quadratic solver, logarithm, probability, fractions, and more.
19 tools available · 100% free · No signup required
Square Root Calculator
Square Root Calculator finds the square root of any number online for free. Also shows cube root and fourth root instantly.
Exponent Calculator
Exponent Calculator raises any base to any power online for free. Compute powers, squares, cubes, and negative or decimal exponents instantly.
Factorial Calculator
Factorial Calculator computes n! for any whole number online for free. Get factorials instantly with clear handling of large and invalid inputs.
Prime Number Checker
Prime Number Checker tells you if a number is prime online for free. Instantly check primality and see the smallest factor if it is not prime.
LCM & GCD Calculator
LCM and GCD Calculator finds the least common multiple and greatest common divisor of two numbers online for free with instant results.
Pythagorean Theorem Calculator
Pythagorean Theorem Calculator finds the missing side of a right triangle online for free. Enter any two sides to compute the third instantly.
Quadratic Equation Solver
Quadratic Equation Solver finds the roots of ax² + bx + c = 0 online for free. Enter the coefficients to get real roots and the discriminant instantly.
Logarithm Calculator
Logarithm Calculator computes the log of any number to any base online for free. Find log base 10, natural log, and custom-base logs instantly.
Permutation & Combination Calculator
Permutation and Combination Calculator computes nPr and nCr online for free. Enter n and r to find arrangements and selections instantly.
Probability Calculator
Probability Calculator finds the probability of events online for free. Compute single-event odds plus P(A or B) and P(A and B) instantly.
Fraction Calculator
Fraction Calculator adds, subtracts, multiplies, and divides fractions online for free. Get simplified results in lowest terms instantly.
Triangle Calculator
Solve any triangle from SSS, SAS, ASA, AAS or SSA and get sides, angles, area, altitudes, medians, inradius and circumradius. The SSA ambiguous case shows both valid triangles.
Circle Calculator
Enter any one of radius, diameter, circumference or area and get the other three, plus sector area, arc length, chord, segment area and the equation of the circle.
Slope Calculator
Find the slope between two points along with the angle, distance, midpoint and percentage grade, and get the line in slope-intercept, point-slope and standard form.
Matrix Calculator
Add, subtract, multiply, transpose, invert and power matrices up to 4x4, with determinants to 5x5. Shows the cofactor expansion and every Gauss-Jordan row operation.
Z-Score Calculator
Turn a raw score into a z-score and read the left-tail, right-tail and two-tail probability plus the percentile, with a shaded bell curve and the working shown.
Mean, Median, Mode & Range Calculator
Paste any list of numbers to get the mean, median, every mode, range, quartiles, IQR, outliers and both sample and population standard deviation, clearly labelled.
Sequence Calculator
Find the nth term and sum of arithmetic, geometric and Fibonacci sequences, test whether an infinite series converges, or paste terms and let the tool detect the pattern.
Confidence Interval Calculator
Build a confidence interval for a mean with σ known or unknown, or for a proportion, at 90, 95, 99 or any custom level — plus the sample size a target margin of error needs.
Math homework, coding problems, and everyday number crunching all involve the same handful of operations done accurately and quickly. These math tools cover them: square roots and exponents, factorials, prime checking, greatest common divisor and least common multiple, the Pythagorean theorem, quadratic equations, logarithms, permutations and combinations, probability, and fraction arithmetic. Each one shows the answer instantly, and several explain the steps so the tool doubles as a way to learn rather than just to compute. Students working through assignments, teachers preparing examples, developers verifying algorithmic logic, and professionals double-checking figures in reports all benefit from having a reliable, instant math reference a single click away.
For students, teachers, and developers
A student can check a quadratic solution and see whether the roots are real, a teacher can generate quick worked examples, and a developer can confirm a GCD or a factorial while writing an algorithm. Because the calculators handle the edge cases carefully — a negative under a square root, a discriminant below zero, a factorial of a very large number — you get a clear message instead of a confusing error or a wrong figure. The step-by-step breakdowns show the working alongside the answer, which makes them useful for self-study and revision: you can attempt the problem first, then compare your method against the tool's solution. Teachers can project the tool in class to demonstrate how changing one coefficient reshapes a quadratic's graph.
Accurate results with sensible guards
Every tool parses your input, guards against undefined operations like dividing by zero, and formats the output cleanly so you never see a raw NaN or an infinite value. Fraction results are reduced to their simplest form, probabilities are validated to stay within a valid range, and large computations are capped with an explanation rather than freezing. The goal is a dependable answer you can trust for schoolwork, exams prep, and quick real-world calculations. Results use standard mathematical notation where possible and are formatted for easy copying into documents, spreadsheets, or code. Because all processing runs in your browser, there is no latency — answers appear as soon as you finish typing, making iterative exploration feel natural.