Pounds to Kilograms Converter
Convert pounds to kilograms instantly. 1 lb = 0.45359237 kg exactly. Formula, table and how gym weight plates reveal the gap.
Written by Rahman · Last reviewed
Quick answer
One pound equals exactly 0.45359237 kilograms. Multiply pounds by 0.45359237 to get kilograms, so a 150 lb adult weighs about 68.0 kg.
| Kilogram (kg) | 0.45359237 |
| Gram (g) | 453.59237 |
| Milligram (mg) | 453592.37 |
| Microgram (µg) | 453592370 |
| Tonne (metric) (t) | 0.00045359237 |
| Pound (lb) | 1 |
| Ounce (oz) | 16 |
| Stone (st) | 0.07142857143 |
| Carat (ct) | 2267.96185 |
| US ton (short) (ton) | 0.0005 |
| Long ton (UK) (long ton) | 0.0004464285714 |
lb to kg conversion table
| lb | kg |
|---|---|
| 1 lb | 0.45359237 kg |
| 2 lb | 0.90718474 kg |
| 3 lb | 1.36077711 kg |
| 4 lb | 1.81436948 kg |
| 5 lb | 2.26796185 kg |
| 6 lb | 2.72155422 kg |
| 7 lb | 3.17514659 kg |
| 8 lb | 3.62873896 kg |
| 9 lb | 4.08233133 kg |
| 10 lb | 4.5359237 kg |
| 20 lb | 9.0718474 kg |
| 30 lb | 13.6077711 kg |
| 40 lb | 18.1436948 kg |
| 50 lb | 22.6796185 kg |
| 60 lb | 27.2155422 kg |
| 70 lb | 31.7514659 kg |
| 80 lb | 36.2873896 kg |
| 90 lb | 40.8233133 kg |
| 100 lb | 45.359237 kg |
| 250 lb | 113.3980925 kg |
| 500 lb | 226.796185 kg |
| 1000 lb | 453.59237 kg |
How to convert lb to kg
Gym weight plates expose the mismatch clearly: a US "45-pound plate," the standard size for a full Olympic barbell set, is 20.41 kg, not the 20 kg plate that is the actual metric standard used everywhere else. The two plate systems are similar enough to look interchangeable on a rack and different enough that mixing them changes the loaded weight by a few percent.
The exact figure 0.45359237 was fixed by the 1959 international yard-and-pound agreement between the US, UK, Australia, Canada, New Zealand and South Africa, replacing several slightly different national definitions of the pound that had drifted apart since the 19th century. Boxing and mixed martial arts weigh-ins are conducted in pounds in North America and kilograms almost everywhere else, so a fighter's official weight is often reported in both units side by side in international coverage.
Frequently Asked Questions
How many kg is 200 lbs?
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200 lb is about 90.7 kg.