Most of the world uses the Metric System (SI) based on powers of ten (meters, kilograms, liters), while the United States, Myanmar, and Liberia predominantly use the US Customary / Imperial system (inches, feet, pounds, gallons).
Essential Length Conversion Factors
- 1 inch (in) = exactly 2.54 centimeters (cm)
- 1 foot (ft) = 12 inches = 0.3048 meters (m)
- 1 yard (yd) = 3 feet = 0.9144 meters (m)
- 1 mile (mi) = 5,280 feet = 1.609344 kilometers (km)
Essential Weight & Mass Conversion Factors
- 1 pound (lb) = 16 ounces (oz) = 0.45359237 kilograms (kg)
- 1 kilogram (kg) ≈ 2.20462 pounds (lbs)
- 1 metric tonne (t) = 1,000 kg ≈ 2,204.6 lbs