100 lb in kg

100 lb is 45.359 kilograms. That is also 7 stone 2 pounds, or 45,359.2 grams.

Factors from their legal definitions.

100 pounds is 45.359 kilograms.

One pound	0.4536 kg
One kilogram	2.205 lb

Show the workings

Step	Sum	Answer
One pound in kilograms	0.45359237 kg	0.454 kg
In kilograms	100 × 0.4536	45.359 kg

A pound in kilograms: 0.454 kg per pound. Source: Weights and Measures Act 1985, Schedule 1. Checked 13 November 2026.

Nearby values

To convert pounds to kilograms, multiply by 0.4536. Open "Show the workings" above to see this sum step by step.