Pounds (lbs) to KG
Convert pounds to kilograms — 1 lb is exactly 0.4536 kg. With the halve-minus-10% rule and a weigh-in table.
Fast, easy and free — your answer appears as you type, and whatever you enter stays on your device.
One pound is exactly 0.45359237 kilograms — roughly halve the pounds and take off 10% of the half. Type any weight below and the exact answer appears as you type.
How to use it
- Type the pound valueThe kilogram answer appears as you type — no button to press.
- Or go the other waySwap flips the direction to kilogram → pound in one tap.
- Check the workingThe exact factor or formula used is shown beneath the answer, so the result is checkable, not just asserted.
Pounds in kilograms
| lb | kg |
|---|---|
| 1 lb | 0.454 kg |
| 10 lb | 4.536 kg |
| 100 lb | 45.36 kg |
| 110 lb | 49.9 kg |
| 130 lb | 58.97 kg |
| 150 lb | 68.04 kg |
| 180 lb | 81.65 kg |
| 200 lb | 90.72 kg |
| 220 lb | 99.79 kg |
The quick rule for your head
Halve it, then subtract a tenth of the half: 180 lbs → 90 − 9 = 81 kg (exact: 81.6). For gym numbers, the plates line up conveniently: a 45 lb plate is 20.4 kg, which is why American 45s and metric 20s live the same life on opposite sides of the ocean.
Where this conversion shows up
American body weights arriving in metric contexts: health forms, sports statistics and fitness programmes written in pounds all need this direction. Shipping and freight cross it constantly too — US package weights in pounds against European carrier limits in kilograms.
Need other units too? The fullweight converter handles every pair and shows the exact factor behind each answer. For the opposite direction, use KG to Pounds (lbs).
Questions people ask
How many kg is 1 pound?
Exactly 0.45359237 kg — fixed by international agreement in 1959. Roughly: a pound is just under half a kilo.
What is 150 lbs in kg?
68 kg. The table runs 100–220 lbs, covering most adult weigh-ins; 220 lbs is almost exactly 100 kg, a handy double-anchor.
Why is the definition on the pound side?
The 1959 agreement defined the avoirdupois pound in terms of the kilogram, making the pound the derived unit. Every imperial weight — ounce, stone, ton — chains off that one number.
What about stones?
A stone is 14 lbs (6.35 kg), still standard for body weight in the UK and Ireland — '11 stone 4' is 158 lbs or 71.7 kg. The main weight converter includes stones.