Bidirectional unit converters for length, weight, temperature, and distance. Edit either field and the other updates instantly.
Convert between inches and centimeters in both directions. Includes a quick reference table for common lengths.
Convert between pounds and kilograms instantly. Includes reference weights from 1 lb up to 200 lbs.
Bidirectional temperature converter with common reference points like body temperature, water boiling point, and oven temperatures.
Convert between miles and kilometers. Includes runner's reference for 5K, 10K, half marathon, and full marathon distances.
The United States primarily uses the imperial system (inches, pounds, Fahrenheit, miles) while most of the rest of the world uses the metric system (centimeters, kilograms, Celsius, kilometers). This creates a constant need for conversion in travel, cooking, fitness, science, and international commerce.
All of our converters are bidirectional — you can type in either field and the other updates automatically. All conversion factors used are exact international standard values, not approximations.