Math & Scientific Calculators
Solve equations, convert units, work with fractions and matrices, or run full scientific calculations — free, in your browser, no account required.
Page verified • Last updated: August 2026
NumCalcX has 29 math and scientific calculators covering everything from a quick percentage to full algebra, matrix operations, numerical calculus, number theory, and a dedicated probability suite. Every tool below runs entirely client-side: nothing you type is sent to a server, and there's nothing to sign up for. Click any calculator to jump straight in.
Algebra & Core Math
Algebra Solver
Solve quadratic equations, linear equations, and systems of up to 6 equations with Gaussian elimination. Example: solve 2x + 3y = 12 and x − y = 1 for x and y.
→Percentage Calculator
Five modes in one tool: percentage of a number, what percent X is of Y, percent change, difference, and add/subtract with reverse calculation.
→Fraction Calculator
Add, subtract, multiply, and divide fractions and mixed numbers, with a step-by-step solution shown.
→Ratio Calculator
Simplify a ratio to lowest terms, or solve a proportion (rule of three) to find a missing value.
→Exponent Calculator
Compute x raised to the power of y, including negative and fractional exponents.
→Rounding Calculator
Round a number to a set number of decimal places or to the nearest multiple of N.
→Percent Error Calculator
Calculate percent error between an experimental (measured) value and a theoretical (accepted) value.
→Number Sequence Calculator
Find any term and the sum of an arithmetic or geometric sequence.
→Factor Calculator
Find every factor (divisor) of a whole number, plus whether it's prime, composite, or perfect.
→Big Number Calculator
Add, subtract, multiply, divide, or raise huge integers to a power with exact precision.
→Long Division Calculator
See the quotient, remainder, and the full step-by-step long division work for any two integers.
→Geometry & Measurement
Geometry Calculator
Calculate area, perimeter, and volume for circles, triangles, rectangles, spheres, cylinders, cones, and more.
→Triangle Calculator
Solve for every remaining side and angle of a triangle from a known combination of three.
→Distance Calculator
Calculate the straight-line distance between two points in 2D or 3D space.
→Slope Calculator
Find the slope between two points, plus the line's equation in slope-intercept and point-slope form.
→Probability & Statistics
Probability Calculator
Calculate permutations, combinations, single and compound event probabilities, and odds. Example: the odds of drawing two aces in a row from a deck.
→Statistics Calculator
Enter a dataset and instantly get mean, median, mode, range, variance, and standard deviation.
→Coin Flip Calculator
Probability of getting heads or tails an exact or minimum number of times across multiple flips, including streaks.
→Dice Roll Calculator
Probability of rolling a specific sum with two or more dice — exactly, at least, or at most — plus the full sum distribution.
→At Least One Calculator
Probability of at least one success across multiple independent attempts, using the complement rule.
→Cumulative Probability Calculator
Find how many attempts you need to reach a target confidence level, plus the cumulative probability curve.
→Card Draw Calculator
Probability of drawing a target number of matching cards from a deck, with or without replacement.
→Random Number Generator
Generate one or many unbiased random integers in any range using a cryptographically secure source.
→Advanced & Specialized
Scientific Calculator
Trig, logs, exponents, roots, and factorials — now programmable, so you can save variables and build reusable formulas.
→Calculus Calculator
Numerical derivative or definite integral of any function f(x), with a live plot.
→Matrix Calculator
Add, subtract, multiply, and find the determinant, transpose, or inverse of matrices up to 5x5.
→Unit Converter
Convert between metric and imperial units for length, weight, volume, temperature, area, speed, time, and data storage.
→Number Base Converter
Convert between binary, octal, decimal, and hexadecimal, with support for custom bases from 2 to 36.
→Number Theory Calculator
Prime factorization, primality testing, or modular exponentiation for cryptography-scale numbers.
→Frequently Asked Questions
Are these math calculators free to use?
Yes. Every calculator on NumCalcX runs entirely in your browser — no sign-up, no account, and no data sent to a server.
Which calculator should I use to solve a system of equations?
Use the Algebra Solver — it handles linear systems with up to 6 equations using Gaussian elimination and shows each step.
Can I use these calculators for homework or exams?
Yes — they're built to show full step-by-step work, not just a final answer, so you can check your process against the Fraction Calculator, Algebra Solver, and Geometry Calculator.