Math

Percentages, fractions, GCD/LCM, prime numbers and equation solvers.

• Percentage Calculator

  Calculate a percentage of a number, or what percentage one number is of another, instantly.

  Open tool
• GCD and LCM Calculator

  Calculate the greatest common divisor (GCD) and least common multiple (LCM) of two numbers instantly.

  Open tool
• Prime Number Checker & Generator

  Check if a number is prime, and list all prime numbers up to a limit, instantly.

  Open tool
• Quadratic Equation Solver

  Solve ax² + bx + c = 0 instantly, including complex roots, with step-free live results.

  Open tool
• Roman Numerals Converter

  Convert a number to Roman numerals or Roman numerals to a number, instantly, both ways.

  Open tool