Math Calculators

Pure math calculators and converters. No external data.

Percentage

Percentage Calculator

What is X% of Y? Percent increase/decrease.

Health

BMI Calculator

Body Mass Index — weight(kg) / height(m)²

Geometry

Circle Area

A = πr²

Sphere Volume

V = (4/3)πr³

Cylinder Volume

V = πr²h

Cone Volume

V = (1/3)πr²h

Pythagorean Theorem

a² + b² = c²

Fractions

Fraction to Decimal

Convert fractions to decimals and percentages

Number Converters

Decimal to Binary

Convert numbers to binary (base 2)

Decimal to Hex

Convert numbers to hexadecimal (base 16)

Roman Numerals

Convert 1-3999 to Roman numerals