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Unit Converter
Convert length, weight, area, volume, speed, and more.
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Unit Converter
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See unit list in results
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About Unit Converter
Our unit converter supports five measurement categories with 50+ units. Convert between metric and imperial units for length, weight, area, volume, and speed.
Frequently Asked Questions
1 kilometer = 0.621371 miles. Multiply km by 0.621371. For example, 10 km = 6.21 miles. Quick mental estimate: multiply by 0.6. Conversely, 1 mile = 1.60934 km.
1 kilogram = 2.20462 pounds. Multiply kg by 2.20462. For example, 70 kg = 154.32 lbs. Quick estimate: multiply by 2.2. Conversely, 1 pound = 0.453592 kg.
Length: 1 inch = 2.54 cm. 1 foot = 0.3048 m. 1 mile = 1.609 km. Weight: 1 lb = 0.4536 kg. 1 oz = 28.35 g. Volume: 1 gallon (US) = 3.785 L. 1 liter = 1.0567 quarts. Temperature: see temperature converter.
The US customary and UK imperial systems are similar but not identical. Key differences: 1 US fluid ounce = 29.57 mL vs 1 UK fl oz = 28.41 mL. 1 US gallon = 3.785 L vs 1 UK gallon = 4.546 L. Always specify US or UK when converting fluid measures.
SI (Système International d'Unités) is the modern metric system used worldwide in science and most countries. Base units: meter (length), kilogram (mass), second (time), ampere (current), kelvin (temperature), mole (amount), candela (light intensity).
Area conversion requires squaring the linear factor. 1 m² = 10,000 cm² (100² = 10,000). 1 km² = 1,000,000 m². 1 acre = 4,047 m² = 0.4047 hectare. 1 square mile = 640 acres = 2.59 km².
The US retains customary units due to historical, cultural, and economic reasons — the cost of converting all industry standards, signage, and consumer products is enormous. The US is one of only three countries (with Myanmar and Liberia) that hasn't officially adopted the metric system.
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