Pounds to Kilograms — lbs ↔ kg Converter & Table
Convert between pounds and kilograms — plus a body weight reference table for common weights.
The Formula
The avoirdupois pound is defined as exactly 0.45359237 kilograms. Round this to 0.4536 for everyday conversions:
- lbs to kg: multiply by 0.4536 (or divide by 2.2046)
- kg to lbs: multiply by 2.2046 (or divide by 0.4536)
Quick mental math: divide lbs by 2.2 for a rough kg estimate. It's off by 0.2%, negligible for most purposes but not suitable for lab measurements.
Common Weight Conversions
| Pounds (lbs) | Kilograms (kg) | Note |
|---|---|---|
| 100 lbs | 45.36 kg | — |
| 110 lbs | 49.90 kg | — |
| 120 lbs | 54.43 kg | — |
| 130 lbs | 58.97 kg | — |
| 140 lbs | 63.50 kg | — |
| 150 lbs | 68.04 kg | ~avg adult female (US) |
| 160 lbs | 72.57 kg | — |
| 170 lbs | 77.11 kg | — |
| 180 lbs | 81.65 kg | ~avg adult male (US) |
| 200 lbs | 90.72 kg | — |
| 220 lbs | 99.79 kg | ~100 kg |
Why International Students Use This Most
US university health forms, athletics physicals, and gym equipment all use pounds. International students who grew up with kilograms hit this conversion constantly — particularly when filling in weight fields on medical intake forms, calculating medication doses (which US pharmacies often state per pound), or comparing their measurements against US-specific BMI and fitness charts.
If you also need to convert height (cm ↔ feet/inches), the cm to inches converter handles that. For all unit categories in one place, use the full unit converter.