Free Online Math Calculators
A set of browser-based math tools covering arithmetic, algebra, statistics, geometry, and function visualisation. No login, no install — open a tool and start calculating.
Arithmetic
Quick calculations for everyday numbers — find percentages, work with fractions, and get answers without hunting for a calculator app.
Algebra
Solve for unknowns step by step. Enter your equation's coefficients and see every algebraic step from the problem to the answer — useful for checking homework or learning the method.
Statistics
Summarise a dataset in seconds. Paste a list of numbers and instantly get mean, median, mode, standard deviation, variance, and a distribution histogram.
Geometry
Calculate area, perimeter, volume, and surface area for common shapes. Pick a shape, enter dimensions, and see every relevant measurement with the formula shown.
Visualization
Draw the graph of any mathematical expression. Type a formula, set the x range, and see it plotted instantly. Includes presets for math fundamentals and machine learning activation functions.
About these tools
Every tool on this page runs directly in your browser using JavaScript — there is no server involved and your data never leaves your device. You get results as you type, without pressing submit or waiting for a round trip.
The Percentage Calculator covers three common use cases in one place: finding X% of a number, calculating the percentage change between two values, and reversing a percentage to find the original whole. The Fraction Calculator simplifies results to lowest terms and shows the working steps.
The Equation Solver handles linear (ax + b = c) and quadratic (ax² + bx + c = 0) equations with full step-by-step output. The Statistics Calculator accepts a list of numbers and returns ten descriptive statistics plus a histogram. The Shape Calculator covers six shapes — circle, rectangle, square, right triangle, sphere, and cylinder.
The Function Plotter draws the graph of any mathematical expression in x. It includes a dedicated AI / ML tab with presets for activation functions (ReLU, sigmoid, tanh, GELU, Swish), loss functions (MSE, MAE, Huber, hinge), and probability distributions (Gaussian, Laplace) — each with a plain-English explanation of what it does and why it matters in machine learning.
Frequently asked questions
Are all the math tools free?
Yes. Every tool on this page is free to use with no account or sign-up required.
Do the tools work on mobile?
Yes. All tools are designed to work on phones and tablets. The layouts adapt to small screens.
Is my data sent to a server?
No. All calculations run directly in your browser. Your numbers never leave your device.
Can I use these for school or university work?
Yes. The tools show step-by-step working where applicable, making them useful for verifying answers and understanding methods.
What is the function plotter used for?
It draws the graph of any formula in x — useful for visualising equations, exploring how changing a coefficient affects the curve, and understanding common functions used in mathematics and machine learning.
What math topics are covered?
Arithmetic (percentages, fractions), Algebra (linear and quadratic equations), Statistics (mean, median, mode, standard deviation, histogram), Geometry (area, perimeter, volume for 6 shapes), and Visualization (function plotter with math and AI/ML presets).