Convert Pounds to Kilograms
1 pound is 0.45 kg. One pound is exactly 0.45359237 kilograms.
One pound is 0.45359237 kilograms. To convert pounds to kilograms, multiply by 0.45359237; to go the other way, divide by 0.45359237 or multiply by 2.2046226. The factor is exact rather than rounded: it follows from NIST Handbook 44. Exactly 0.45359237 kilograms by international agreement, and sixteen ounces.
Factor checked against the defining standard · How we check
- Pounds × 0.45359237
1 * 0.45359240.454 kg
1 pound in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 16 oz | × 16 |
| pounds (as entered) | 1 lb | — |
| stone | 0.07142857143 st | × 0.0714285714286 |
| US tons | 0.0005 ton | × 0.0005 |
| micrograms | 453,592,370 mcg | × 453,592,370 |
| milligrams | 453,592.37 mg | × 453,592.37 |
| centigrams | 45,359.237 cg | × 45,359.237 |
| grams | 453.59237 g | × 453.59237 |
| kilograms | 0.45359237 kg | × 0.45359237 |
| slugs | 0.03108095017 slug | × 0.0310809501716 |
| tonnes | 0.00045359237 t | × 0.00045359237 |
| carats | 2,267.96185 ct | × 2,267.96185 |
| troy ounces | 14.58333333 ozt | × 14.5833333333 |
| grains | 7,000 gr | × 7,000 |
| long tons | 0.0004464285714 LT | × 0.000446428571429 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert pounds to kilograms? The converter and the working
- 1.Take the measurement in pounds.
- 2.Multiply by 0.45359237 — that is how many kilograms fit in one pound.
- 3.To go back the other way, divide by 0.45359237, or multiply by 2.2046226.
Worked example: 25 pounds to kilograms
- Formula
- lb × 0.45359237 = kg
- Arithmetic
- 25 × 0.45359237 = 11.34 kg
- Answer
- 25 lb = 11.34 kg
The factor is exact, so this figure is exact too — only the display is rounded.
Pounds to kilograms conversion table
| Pounds | Kilograms |
|---|---|
| 1 lb | 0.45 kg |
| 2 lb | 0.91 kg |
| 3 lb | 1.36 kg |
| 4 lb | 1.81 kg |
| 5 lb | 2.27 kg |
| 6 lb | 2.72 kg |
| 7 lb | 3.18 kg |
| 8 lb | 3.63 kg |
| 9 lb | 4.08 kg |
| 10 lb | 4.54 kg |
| 12 lb | 5.44 kg |
| 15 lb | 6.8 kg |
| 20 lb | 9.07 kg |
| 25 lb | 11.34 kg |
| 50 lb | 22.68 kg |
| 100 lb | 45.36 kg |
| 200 lb | 90.72 kg |
| 300 lb | 136.08 kg |
| 500 lb | 226.8 kg |
| 1000 lb | 453.59 kg |
| 2000 lb | 907.18 kg |
| 5000 lb | 2,267.96 kg |
| 10000 lb | 4,535.92 kg |
Exactly 0.45359237 kilograms, by definition
The international avoirdupois pound has been exactly 0.45359237 kg since 1959, so the conversion terminates and nothing on this page is rounded except for display. The everyday shortcut of 2.2 pounds to the kilogram is short by about a tenth of a per cent — a fifth of a pound on a 90 kg person.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is a pound?
Exactly 0.45359237 kilograms by international agreement, and sixteen ounces.
What is a kilogram?
The SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by a metal cylinder in Paris.
How many kilograms are in a pound?
One pound is 0.45359237 kilograms, exactly. Going the other way, one kilogram is 2.2046226 pounds. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a pound.
Cite this page
- APA
- Rule Calculator. (2026). Convert Pounds to kilograms. Rule Calculator. https://rulecalculators.com/convert/pound-to-kilogram
- MLA
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- Chicago
- Rule Calculator. "Convert Pounds to kilograms." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/pound-to-kilogram.
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Questions people actually ask
- How many kilograms are in a pound?
- 0.45359237. The SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by a metal cylinder in Paris.
- How do I convert kilograms back to pounds?
- Divide by 0.45359237, or multiply by 2.2046226 — they are the same operation.
The values people look up
Each one is this page with the value filled in, and each answers in its own title.
Other weight conversions
Kilograms to pounds — the same conversion the other way.