UK weight-loss calculator
lbs to kg converter
Convert pounds to kilograms. Also searched as pounds to kg, the same conversion. Type into either box to convert in both directions.
Updated
lb = kg
Displayed values are rounded for readability, but the arithmetic uses the full precision of the internationally defined factors, a pound is exactly 0.45359237 kg and a stone is exactly 14 pounds, so converting back and forth will not drift.
Pounds to Kilograms
70 kg
154.3 lb converts to the figure on the left, exactly. Nothing in it is an approximation.
About pounds and kilograms
The international avoirdupois pound has been defined as exactly 0.45359237 kilograms since 1959, so this conversion is exact rather than approximate.
A quick approximation: halve the pounds and subtract 10%. 160 pounds halved is 80, minus 10% is 72 kg. The exact answer is 72.6 kg.
The conversion
kg = pounds × 0.45359237The table below is generated from the same conversion used by the tool above, so the two always agree.
| Pounds | Kilograms |
|---|---|
| 100 lb | 45.4 kg |
| 110 lb | 49.9 kg |
| 120 lb | 54.4 kg |
| 130 lb | 59 kg |
| 140 lb | 63.5 kg |
| 150 lb | 68 kg |
| 160 lb | 72.6 kg |
| 170 lb | 77.1 kg |
| 180 lb | 81.6 kg |
| 190 lb | 86.2 kg |
| 200 lb | 90.7 kg |
| 210 lb | 95.3 kg |
| 220 lb | 99.8 kg |
| 230 lb | 104.3 kg |
| 240 lb | 108.9 kg |
| 250 lb | 113.4 kg |
| 260 lb | 117.9 kg |
| 270 lb | 122.5 kg |
| 280 lb | 127 kg |
| 290 lb | 131.5 kg |
| 300 lb | 136.1 kg |
A note on rounding
Conversions are shown rounded for readability, weights to a tenth of a unit, heights to the nearest inch or centimetre. The underlying arithmetic uses the full precision of the internationally defined factors, so repeatedly converting back and forth will not drift.
Bathroom scales themselves are usually accurate to within a few hundred grams at best, and body weight varies by a kilogram or more across a single day. That variation is far larger than any rounding here.
Related calculators
Frequently asked questions
How do I convert pounds to kg?
Multiply the number of pounds by 0.45359237. For a quick estimate, divide by 2.2.
Important information
The calculators on this site provide general information and estimates. They are not medical advice and they do not diagnose any condition.
Everyone is different, and individual energy needs vary for reasons these equations cannot capture. If you have a health condition, take medication, are pregnant or breastfeeding, or have any concerns about your weight, speak to your GP, pharmacist or a registered dietitian.