Pounds to Kilograms Converter (lb to kg)

How to use this calculator: lbs to kg

1. 1Enter the value measured in pound (lb).
2. 2Confirm the direction is Pound (lb) to Kilogram (kg); reversing the units changes the factor or offset.
3. 3Apply kg = lb × 0.45359237. The live converter performs this substitution as you type.
4. 4Read the answer in kg and keep only justified precision.

Conversion formula

Pounds (lb) are an imperial unit of mass; kilograms (kg) are the SI unit. One pound equals exactly 0.45359237 kilograms, so dividing pounds by 2.20462 gives kilograms.

The units measure the same quantity at different scales: 1 lb = 0.45359237 kg, and 1 kg = 2.20462262 lb.

Worked conversion example: Pounds to Kilograms

1. Given: 50 lb
2. Substitute: kg = 50 × 0.45359237 = 22.6796185
3. Result: 50 lb = 22.6796185 kg

Accuracy checklist

The converter keeps extra precision internally. Report only the precision supported by the original measurement and follow the required rounding rule.

Direction check: a smaller unit usually gives a larger number; temperature is an exception.

Unit definitions and SI traceability: NIST Office of Weights and Measures — SI Units.