Home / Conversions / Weight Converter / lb to kg Pounds to kilograms (lb to kg) 1 lb = 0.45359237 kg. Enter any value below to convert pounds to kilograms instantly, or use the weight converter for every other unit.
Maintained by Jairo Tunisse · Last updated October 5, 2026 · Editorial policy
1 lb = 0.45359237 kg
kg = lb × 0.45359237
Converted value 1 lb = 0.45359237 kg 1 lb = 0.45359237 kg
1 lb = 0.45359237 kg (exact)
Result in Kilograms (kg) 0.45359237
Reverse factor 1 kg = 2.204622622 lb
Common weight conversions 1 oz 28.34952313 g 1 lb 0.45359237 kg 1 st 6.35029318 kg 1 st 14 lb 1 kg 2.204622622 lb 1 g 0.03527396195 oz 1 t 2,204.622622 lb
Pounds to kilograms conversion table Pounds to kilograms Pounds (lb) Kilograms (kg) 1 lb 0.45359237 kg 5 lb 2.26796185 kg 10 lb 4.5359237 kg 25 lb 11.33980925 kg 50 lb 22.6796185 kg 100 lb 45.359237 kg 150 lb 68.0388555 kg 200 lb 90.718474 kg 250 lb 113.3980925 kg
The formula kg = lb × 0.45359237
1 lb = 0.45359237 kg (exact). 1 kg = SI base unit. These are exact definitions, so the only rounding is in the displayed result (10 significant digits).
When you need it Pounds to kilograms is common for medical dosing by body weight, international shipping and fitness logs. Multiply by 0.45359237 — the international pound's exact definition.
More weight converter conversions Frequently asked questions How do I convert pounds to kilograms? Multiply the value in pounds by 0.45359237 (or divide by 2.204622622). For example, 25 lb = 11.33980925 kg.
How many kilograms are in one pound? 1 lb = 0.45359237 kg.
Why do doctors use kilograms? Most drug doses are specified per kilogram of body weight, so weight in pounds is converted to kg first.
How many grams are in a pound? Exactly 453.59237 grams.
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Conversions use exact published unit definitions and are rounded to 10 significant digits for display. For legal metrology, trade or engineering work, confirm the governing standard.