QuicklyTools

Unit Converter

Convert between metric and imperial units instantly — length, weight, temperature, and volume.

length Conversion

Conversion rate

1 m = 3.28084 ft

How to Use the Unit Converter

  1. Select a category: Length, Weight, Temperature, or Volume.
  2. Enter a value in any unit field — all other units in the category update simultaneously.
  3. No submit button needed — conversions happen as you type.

Common Conversion Reference

Length

  • 1 inch = 2.54 centimeters
  • 1 foot = 0.3048 meters
  • 1 mile = 1.60934 kilometers
  • 1 yard = 0.9144 meters

Weight

  • 1 pound = 0.453592 kilograms
  • 1 ounce = 28.3495 grams
  • 1 stone = 6.35029 kilograms (14 pounds)
  • 1 metric ton = 1,000 kilograms = 2,204.62 pounds

Temperature

  • °C to °F: multiply by 9/5, then add 32
  • °F to °C: subtract 32, then multiply by 5/9
  • °C to K: add 273.15
  • Key points: water freezes at 0°C / 32°F, boils at 100°C / 212°F

Volume

  • 1 US gallon = 3.78541 liters
  • 1 US fluid ounce = 29.5735 milliliters
  • 1 US cup = 236.588 milliliters
  • 1 US pint = 473.176 milliliters

Frequently Asked Questions

Why does the US use imperial while most countries use metric?

The US, Liberia, and Myanmar are the only countries that have not officially adopted the metric (SI) system as their primary standard. The US made metric the official system in 1975 with the Metric Conversion Act but left adoption voluntary, so imperial units remained dominant in everyday use. Science, medicine, and the military largely use metric in the US.

What is the difference between a US gallon and a UK gallon?

A US gallon is 3.785 liters. A UK (imperial) gallon is 4.546 liters — about 20% larger. This matters when comparing fuel economy (mpg) figures between American and British vehicles. This converter uses US measurements for gallons, pints, and fluid ounces.

What is absolute zero in Celsius and Fahrenheit?

Absolute zero — the theoretical coldest possible temperature — is 0 Kelvin, which equals −273.15°C or −459.67°F. At this temperature, particles would have minimum thermal motion. It has never been fully achieved in practice, though laboratories have come within billionths of a degree.

How do I convert a recipe from metric to cups?

Use the volume converter for liquids (ml to cups is the most common). For dry ingredients, note that weight-to-volume conversion depends on the ingredient's density — 240ml of water weighs 240g, but 240ml of flour weighs only about 120g. For cooking precision, weight measurements in grams are more reliable than volume.