Unit Converter
Convert between hundreds of units across 9 measurement categories
// Length Conversions
| Unit | Symbol | Value |
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// Common Conversions
About Unit Conversion
Unit conversion involves multiplying or dividing by a conversion factor — a ratio that expresses how many of one unit equals another. For most categories, conversion is linear (multiply by a constant). Temperature is an exception, requiring both multiplication and addition.
Temperature Conversion
Temperature scales differ in both their zero points and scale intervals. Celsius and Fahrenheit have different zero points (0°C = 32°F) and different degree sizes (a 1°C change = a 1.8°F change). Kelvin uses the same degree size as Celsius but starts at absolute zero (−273.15°C).
Metric vs Imperial
The metric system (SI) is based on powers of 10 — kilo = ×1000, centi = ÷100, milli = ÷1000. The imperial system uses historical, non-decimal relationships (12 inches in a foot, 3 feet in a yard, 1,760 yards in a mile). The US is one of very few countries still primarily using imperial units for everyday measurement.
From the Blog
// Quick Tip: km to miles
Multiply km by 0.621371. Or roughly: km × 0.6. 10 km ≈ 6.2 miles. The Fibonacci sequence gives perfect approximations!
// kg to lbs
Multiply kg by 2.20462. Quick trick: double the kg then add 10%. 70 kg → 140 + 14 = 154 lbs (actual: 154.3).
// °C to °F
Double the Celsius, subtract 10%, add 32. 20°C → 40 − 4 + 32 = 68°F (actual: 68°F exactly).
// Litres to gallons
1 US gallon = 3.785 L. 1 UK gallon = 4.546 L. Always check which gallon — they differ by about 20%.