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Math Tools

Everything you need for math. Fast, reliable, and strictly processed in your browser.

Use this free percentage calculator to find the percentage of a number, or what percentage one number is of another.

Generate secure, truly random numbers online within any custom range. Fast, free, and local to your browser.

Find the GCD (Greatest Common Divisor) and LCM (Least Common Multiple) of two numbers easily.

Convert numbers across bases (decimal, binary, hex, octal) securely and simultaneously.

Convert lengths safely across imperial and metric systems (miles, km, meters, feet, inches).

Translate standard integers to Roman numerals instantly, or decode numerals back into modern integers.

Get the exact area and perimeter/circumference measurements of shapes like circles and rectangles.

Solve complex fraction math problems with auto-simplification and decimal conversions.