Conversions
Length, mass, and volume use SI-based factors. Temperature converts between °C, °F, and K.
Precision
Display may round for readability. For legal or trade verification, use certified tables.
How to use it
Choose a category (length, mass, temperature, volume), enter a value, pick from and to units, then convert. The English UI starts with common US/UK-style pairs (e.g. feet→meters, pounds→kilograms, °F→°C, US gallons→liters). The Korean UI starts with centimeters, kilograms, and everyday SI-friendly pairs. You can change the dropdowns anytime. Length, mass, and volume are converted through SI bases (meters, kilograms, liters). Temperature is converted with Celsius in the middle. gal_us is the US liquid gallon; gal_uk is the imperial (UK) gallon—a different volume.
Related information
Everyday US measures often use inches, feet, miles, pounds, ounces, °F, and US fluid ounces or gallons. Science and medicine often use SI. UK road distances use miles but many everyday volumes still use pints and imperial fluid ounces; do not mix US and UK gallons by mistake.