🔢 Math & Conversion Calculators

10 free math & conversion calculators — fast, accurate, no signup.

Calculate percentages, percentage change, and more.

Calculate your GPA from course grades and credit hours.

Add, subtract, multiply, and divide fractions.

Convert between length, weight, temperature, and volume.

Full-featured scientific calculator with advanced functions.

Convert between decimal, binary, hexadecimal, and octal.

Calculate standard deviation, mean, and variance.

Solve quadratic equations and find roots.

Generate random numbers with custom range and options.

Calculate determinant, inverse, and multiply matrices.