LBS to KG Converter
Multiply a mass in pounds by 0.45359237 to get kilograms: the avoirdupois pound is defined as exactly 0.45359237 kilograms. 100 lb = 45.359237 kg.
A pound is 16 ounces, and 14 pounds make a stone. The Unit Converter handles those units too.
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(opens in a new tab)How to convert pounds to kilograms
Formula: kilograms = pounds × 0.45359237
The constant is exact by definition: 1 pound = 0.45359237 kilograms. It is not a rounded approximation.
Because 0.45359237 is exact, a whole number of pounds always converts to a result with at most eight decimal places, so most values in the table below are complete rather than rounded.
Worked example: 150 lb to kilograms
This result is complete, not rounded.
Convert 150 lb
Input
150 lb
Output
150 × 0.45359237 = 68.0388555 kg
Common pounds to kilograms conversions
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.45359237 kg |
| 5 lb | 2.26796185 kg |
| 10 lb | 4.5359237 kg |
| 25 lb | 11.33980925 kg |
| 50 lb | 22.6796185 kg |
| 100 lb | 45.359237 kg |
| 150 lb | 68.0388555 kg |
| 200 lb | 90.718474 kg |
When you need to convert pounds to kilograms
- Body weight on a scale or a form that uses pounds.
- Package and shipping weights from US and UK labels, when a carrier asks for kilograms.
- Recipes and groceries sold by the pound, compared with metric quantities.
- Gym plates: a 45 lb plate is 45 lb = 20.41165665 kg.
Things worth knowing
- Pounds here are avoirdupois pounds. Troy pounds, used for precious metals, and pound-force are different units and are not converted.
Converting back and related converters
To go the other way, use the KG to LBS Converter, which applies pounds = kilograms / 0.45359237. For any other pair of units, open the Unit Converter, or browse every unit converter.
- Inches to CM Converter: height and body measurements often come in both systems.
- Feet to Meters Converter: to convert a height in feet into meters.
Frequently asked questions
How many kg is 1 lb?
1 lb = 0.45359237 kg, which is exact by definition.
How many kg is 100 pounds?
100 lb = 45.359237 kg. Because 0.45359237 is exact, this result is complete rather than rounded.
How can I convert lbs to kg quickly in my head?
Halve the pounds, then subtract 10 percent of that half. For 150 lb that gives 75 - 7.5 = 67.5, within about 1 percent of the exact 68.0388555 kg.
Is a pound heavier than a kilogram?
No. A pound is exactly 0.45359237 kilograms, which is less than half a kilogram, so a kilogram weighs more than two pounds.