Converters

Free Online Converters

Convert units, number formats, encodings, colors, and electrical quantities with clear definitions and validation.

18 converters availableNo account required.

Everyday Units

Convert metric, imperial, nautical, and astronomical length units.

Convert kilograms, pounds, ounces, tonnes, stones, carats, and more.

Convert Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, and Delisle with absolute-zero validation.

Convert litres, millilitres, cubic metres, cups, gallons, pints, and fluid ounces.

Convert square metric and imperial units, hectares, acres, and square miles.

Convert km/h, mph, m/s, ft/s, and knots with exact linear factors.

Convert decimal and binary storage units while keeping bits and bytes clearly distinguished.

Convert between two custom units when you know the factor relating them.

Convert whole integers between binary, octal, decimal, and hexadecimal exactly.

Encode UTF-8 text as binary, hexadecimal, or decimal bytes and decode those byte formats back to text.

Convert canonical Roman numerals and whole numbers from 1 to 3999.

Convert plain decimals to scientific notation and expand scientific notation back to decimal form.

Convert common Latin text, digits, and punctuation to International Morse code and back.

Convert RGB and HEX colors and view equivalent HSL, HSV, and CMYK values with a live swatch.

Convert watts, kilowatts, megawatts, horsepower, and BTU per hour.

Convert microvolts, millivolts, volts, kilovolts, and megavolts.

Convert hertz, kilohertz, megahertz, gigahertz, millihertz, and revolutions per minute.

Convert joules, watt-hours, kilowatt-hours, calories, BTU, and electronvolts.