Free online science and maths tools

Finds Fibonacci numbers by index and checks if a number is Fibonacci.

Finds the greatest common divisor of two or more numbers.

Finds the antiderivative or definite integral of a function.

Finds the lowest common multiple of two or more numbers.

Performs sums, products, inverses and determinants of matrices.

Calculates the modular inverse of a number for a given modulus.

Writes numbers out in words in several languages.

Searches for a digit sequence inside the decimals of pi.

Breaks a number into its prime factors.

Tests whether a number is prime and lists primes in a range.

Converts numbers, dates and years to Roman numerals and back.

Builds the truth table for a Boolean expression you enter.

Differentiates an entered function and presents each rule applied, along with graphs.

Plots surfaces, curves and points in three dimensions that can be rotated.

Draws geometric constructions such as points, lines, circles and polygons with measurements.

Plots equations, inequalities, tables and sliders on an interactive coordinate plane.

Enters matrices and computes products, inverses, determinants and row reduction.

Converts common units with a quick lookup box and many categories.

Calculators for many probability distributions with interactive plots.

Interactive article with 3D diagrams explaining seasons, day length and the Sun path.

Quiz that estimates your personal ecological footprint and number of Earths needed.

Differentiates a function and shows the steps.

Performs matrix operations and shows the working.

Simulator where you adjust energy and policy levers to see global temperature outcomes.