Converters

Unit, number system, and color conversion tools.

Length Converter

Convert length between metric and imperial units.

Weight Converter

Convert weight and mass between kg, lb, oz and more.

Height Converter

Convert height between centimeters, meters, feet and inches.

Area Converter

Convert area units including m², ha, ft², and acres.

Volume Converter

Convert volume between liters, gallons, cups and more.

Temperature Converter

Convert temperature between Celsius, Fahrenheit and Kelvin.

Speed Converter

Convert speed between km/h, mph, knots and m/s.

Time Converter

Convert time units between seconds, minutes, hours and days.

Pressure Converter

Convert pressure between bar, psi, atm, and pascal.

Energy Converter

Convert energy between joules, calories, kWh and BTUs.

Power Converter

Convert power between watts, kilowatts, hp and more.

Frequency Converter

Convert frequency between hertz, kilohertz, RPM and more.

Force Converter

Convert force between newtons, kilogram-force and pounds.

Torque Converter

Convert torque between N·m, lbf·ft, and kg·m.

Angle Converter

Convert angle between degrees, radians, and turns.

Fuel Economy Converter

Convert fuel economy between MPG, km/L, and L/100km.

Data Storage Converter

Convert data storage between bytes, KB, MB, GB and TB.

Roman Numeral Converter

Convert numbers to Roman numerals and back.

Number to Words

Convert numbers into written English words.

Words to Number

Convert written English words into numeric values.

HEX to RGB

Convert a hex color code into RGB values.

RGB to HEX

Convert RGB values into a hex color code.

RGB to HSL

Convert RGB values into HSL color notation.

HSL to RGB

Convert HSL color values into RGB notation.

HEX to HSL

Convert a hex color code into HSL values.

HSL to HEX

Convert HSL color values into a hex color code.

CMYK to RGB

Convert CMYK print colors into RGB screen colors.

RGB to CMYK

Convert RGB colors into CMYK print values.

HSV to RGB

Convert HSV color values into RGB notation.

Color Name to HEX

Convert CSS color names like tomato into hex codes.

About Converters

Free online unit and value converters for everyday, academic, engineering, scientific, and development needs. Convert length, weight, height, area, volume, temperature, speed, time, pressure, energy, power, frequency, force, torque, angles, fuel economy, and data storage in seconds. You can also convert numbers between different formats, including Roman numerals and number words, as well as colors between HEX, RGB, HSL, CMYK, HSV, and CSS color names. The converters are designed to provide fast results directly in your browser without requiring software installation.

Frequently Asked Questions

The converters use standard unit definitions, conversion factors, and mathematical formulas for the supported units. Results are rounded where appropriate for readability.

No. The conversion calculations are performed directly in your browser. The values you enter do not need to be transmitted to a server.

Use the swap button between the From and To unit selectors. This reverses the conversion direction so you can quickly convert the result back to the original unit.

Yes. Each converter includes a copy option that lets you quickly copy the result and use it in documents, code, emails, spreadsheets, or other applications.

Yes. The supported HEX, RGB, HSL, and related color conversions follow standard web color and sRGB conventions, making the results suitable for CSS and frontend development.

Some measurements use different definitions in the United States and the United Kingdom. This is particularly important for units such as gallons, tons, and miles per gallon. Where applicable, the converter distinguishes between US and UK versions.