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Unit Converter

Quickly convert measurements for length, weight, temperature, volume, and area.

Understanding Unit Conversion

Unit conversion is the process of converting a measurement from one unit to another, maintaining the same quantity. Throughout history, different civilizations developed unique measurement systems, leading to the dual system standard used worldwide today: the International System of Units (SI / Metric) and the Imperial / US Customary System.

Metric System (SI)

Based on powers of 10 (meters, grams, liters). Used universally in science and by over 95% of the global population.

Imperial & US Customary

Based on historical human measurements (inches, feet, pounds, miles). Standard in the United States and aviation.

Key Conversion Formulas

  • Length (Meters to Feet)1 m = 3.28084 ft
  • Weight (Kg to Pounds)1 kg = 2.20462 lbs
  • Temperature (Celsius to Fahrenheit)°C = (°F - 32) × 5/9
  • Gallons to Liters1 gal ≈ 3.785 L

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How the calculation works

Unit conversion multiplies by a fixed factor.

1 kilometer = 0.621371 miles 1 kilogram = 2.20462 pounds 1 inch = 2.54 centimeters

Convert through the base unit when the two units are in the same family.

Worked example: 10 kilometers and 70 kilograms

  1. 10 km = 6.2137 miles.
  2. 70 kg = 154.32 lb.
  3. 6 feet = 72 inches = 182.88 cm.

Common conversions

FromTo
10 km6.2137 miles
70 kg154.32 lb
6 feet182.88 cm

Frequently asked questions

How many miles are in 10 kilometers?▼
About 6.2137.
How many pounds are in 70 kilograms?▼
About 154.32.
How many centimeters are in 6 feet?▼
182.88.