Britannica AI Icon
Adding us as a Preferred Source tells Google you trust our content, so our articles show up more often in your Google Search, Discover feed, and AI Overviews.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style
Feedback
Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login).
Thank you for your feedback

Our editors will review what you’ve submitted and determine whether to revise the article.

External Websites

The metric system is designed on the basis of powers of 10. The length of one meter can be divided into 10 decimeters, a decimeter can be divided into 10 centimeters, one meter can be divided into 100 centimeters, and so on. However, the system of units used in the United States, often called the Imperial System or the Customary System, does not have such neat conversions. One mile is 5,280 feet, four quarts make a gallon, and one pound is 16 ounces. Using the interactive tool below, one can easily convert quantities between the two systems.

Lengths can be converted between the metric units of meters, centimeters, or kilometers and the Imperial units of feet, inches, or miles. Weights can be converted between the metric units of kilograms or grams and the Imperial units of pounds or ounces. Volumes can be converted between the metric units of liters or milliliters and the Imperial units of gallons, fluid ounces, pints, or quarts. Temperatures can be converted between the metric degrees Celsius and the Imperial degrees Fahrenheit. Speeds can be converted between kilometers per hour and miles per hour. A reference guide is given that explains the conversion between various units.