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Conversion Calculator

Convert between common units of length, temperature, area, volume, and weight. Bidirectional conversion with instant results.

Conversion Worksheet

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How Unit Conversion Works

Unit conversion uses a ratio between two units of the same type. Most conversions multiply or divide by a fixed factor. Temperature is the exception — it requires formulas because the scales have different zero points.

Length Conversions

Common length conversions between metric and imperial systems:

  • 1 kilometer = 0.6214 miles
  • 1 mile = 1.6093 kilometers = 5,280 feet
  • 1 meter = 3.2808 feet = 39.37 inches
  • 1 foot = 0.3048 meters = 12 inches
  • 1 inch = 2.54 centimeters

Temperature Formulas

  • °C to °F: °F = (°C × 9/5) + 32
  • °F to °C: °C = (°F − 32) × 5/9
  • °C to K: K = °C + 273.15
  • K to °C: °C = K − 273.15

Key reference points: water freezes at 0°C / 32°F / 273.15K and boils at 100°C / 212°F / 373.15K.

Area Conversions

  • 1 acre = 43,560 sq ft = 4,046.86 sq m
  • 1 hectare = 10,000 sq m = 2.471 acres
  • 1 sq mile = 640 acres = 2.59 sq km
  • 1 sq meter = 10.764 sq ft

Volume Conversions

  • 1 gallon (US) = 4 quarts = 8 pints = 16 cups = 3.785 liters
  • 1 liter = 33.814 fl oz = 4.227 cups
  • 1 cubic meter = 1,000 liters = 264.17 gallons
  • 1 tablespoon = 3 teaspoons = 14.79 ml

Weight Conversions

  • 1 kilogram = 2.2046 pounds
  • 1 pound = 16 ounces = 453.59 grams
  • 1 stone = 14 pounds = 6.35 kg
  • 1 metric ton = 1,000 kg = 2,204.6 pounds

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Frequently Asked Questions

How do I convert Fahrenheit to Celsius?

Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, 98.6 degrees F minus 32 is 66.6, and 66.6 x 5/9 = 37 degrees C. To go the other way, multiply Celsius by 9/5 and add 32. To reach Kelvin from Celsius, add 273.15, so 25 degrees C equals 298.15 K.

How many feet are in a mile?

There are 5,280 feet in a mile. The same mile equals 1,760 yards, 63,360 inches and exactly 1,609.344 meters, or about 1.609 kilometers. To convert miles to feet, multiply by 5,280, so 2.5 miles is 13,200 feet. To convert feet to miles, divide by 5,280, so 10,000 feet is about 1.89 miles.

How many grams are in a pound?

One pound equals about 453.59 grams, or 0.4536 kilograms. To convert pounds to grams, multiply by 453.59, so 2 pounds is about 907 grams. To convert grams to pounds, divide by 453.59, so 1,000 grams, which is 1 kilogram, equals about 2.2 pounds. A pound also contains 16 ounces of about 28.35 grams each.

How many liters are in a gallon?

One US gallon equals about 3.785 liters. A UK imperial gallon is larger, at about 4.546 liters, roughly 20 percent more than the US gallon. To convert US gallons to liters, multiply by 3.785, so 5 US gallons is about 18.9 liters. Recipes and fuel prices in the United States always use the US gallon.