About the LBS to KG Converter
This lbs to kg converter changes a weight in pounds into kilograms. You can enter pounds on their own or add extra ounces, which makes it easy to convert baby weights, parcel weights and recipe amounts written as "7 lb 8 oz".
Use it when a doctor, gym, airline or product label gives weight in kilograms but you think in pounds, or when you are filling in a form that only accepts metric units. It also shows the weight in grams and in stone and pounds, which is how body weight is commonly expressed in the UK and Ireland.
The calculation uses the exact legal definition of the pound (0.45359237 kg), so results are precise to any number of decimal places; rounding happens only for display.
With the default inputs, the kilograms is 68.0389 kg. Change any value above to recalculate instantly.
How to use the lbs to kg converter
- 1Enter the weight in pounds.
- 2Add any leftover ounces, or leave the ounces at 0.
- 3Read the weight in kilograms at the top.
- 4Use grams for small items and stone for UK-style body weight.
Formula and method
The international avoirdupois pound is defined as exactly 0.45359237 kilograms, so multiplying pounds by this factor gives an exact result. Any extra ounces are first converted to pounds by dividing by 16 and added to the pounds.
Stone and pounds divides the total pounds by 14: the whole number is stone and the remainder (rounded to 0.1 lb) is pounds. A handy mental shortcut is to halve the pounds and take off 10%, which lands within about 1% of the exact answer.
- lb
- Whole or decimal pounds entered
- oz
- Additional ounces (16 per pound)
- kg
- Result in kilograms
Worked examples
150 lb body weight
150 × 0.45359237 = 68.04 kg. Divided by 14, 150 lb is 10 stone with 10 lb left over.
Newborn weighing 10 lb 8 oz
8 oz is half a pound, so the baby weighs 10.5 lb. 10.5 × 0.45359237 = 4.763 kg, or about 4,763 grams.
200 lb
200 lb × 0.45359237 = 90.72 kg, which is 14 stone 4 pounds.
Frequently asked questions
How many kg is one pound?+
One pound is exactly 0.45359237 kilograms, which is about 0.454 kg or 453.6 grams.
How do I convert lbs to kg in my head?+
Halve the pounds, then subtract 10% of that. For 180 lb: half is 90, minus 9 gives 81 kg; the exact answer is 81.65 kg.
How do I convert pounds and ounces to kg?+
Divide the ounces by 16 and add them to the pounds, then multiply by 0.45359237. For 7 lb 4 oz: 7.25 × 0.4536 = 3.29 kg.
What is 150 lbs in kg?+
150 pounds is 68.04 kilograms. In the UK style that is 10 stone 10 pounds.
Are UK and US pounds the same?+
Yes. Both the UK and the US use the international avoirdupois pound of 0.45359237 kg. Only the troy pound used for precious metals differs.
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