Math

Math tools: random numbers, GCD/LCM, prime checker, factorial, percentages, base converter and body mass index.

Calculate what percentage one number is of another.

Generate random numbers within a range, instantly and locally.

Find the GCD and LCM of two or more numbers instantly.

Check if a number is prime and see its prime factors.

Calculate the factorial (n!) of a number, exact for large values.

Convert numbers between binary, decimal, hexadecimal and octal.

Scientific calculator: trigonometry, logarithms, roots, powers, π and e. Type the expression and get the result.

Solve direct and inverse proportions instantly. Enter three values and get the fourth.

Roll dice online: choose how many dice and how many faces (d4, d6, d8, d10, d12, d20, d100).

Find the typical number of petals of common flowers and see how petal counts follow the Fibonacci sequence.

Tools — Math