Convert pounds to kilograms instantly
Type any weight in pounds (lbs) into the calculator above and get the exact result in kilograms (kg) right away. Whether you are checking a recipe, reading a shipping label, tracking your gym progress, or just making sense of a weight listed in a foreign document, this converter does the maths for you in a split second.
1 lb = 0.4536 kg — that single number is all the conversion ever needs.
How to use the lbs to kg calculator
- Find the weight in pounds you want to convert.
- Type it into the input field above (decimals like 5.5 are fine).
- The result in kilograms appears instantly — no button to press.
- Need to go the other way? Switch to kg → lbs mode with the reverse toggle.
Worked example: converting 150 lbs to kg
Say your bathroom scale reads 150 lbs and you need the weight in kilograms for a doctor's form.
- Start with your weight: 150 lbs
- Multiply by the conversion factor: 150 × 0.45359237
- Result: 68.039 kg
So 150 pounds is just over 68 kg. The calculator above gives you this — and any other value — in under a second.
How the lbs to kg conversion is calculated
The formula is straightforward:
kg = lbs × 0.45359237The factor 0.45359237 is the exact, internationally defined value of one pound in kilograms (set by the international yard and pound agreement of 1959). The calculator uses the full precision factor so your result is always accurate.
Quick-reference conversion table — lbs to kg
| Pounds (lbs) | Kilograms (kg) |
|---|---|
| 1 lb | 0.454 kg |
| 2 lbs | 0.907 kg |
| 5 lbs | 2.268 kg |
| 10 lbs | 4.536 kg |
| 25 lbs | 11.340 kg |
| 50 lbs | 22.680 kg |
| 100 lbs | 45.359 kg |
For the reverse — kg to lbs — multiply kilograms by 2.20462, or use the reverse toggle in the converter above.
lbs = kg × 2.20462Other ways people search for this conversion
People phrase this need in many different ways. Here are the most common, and when each comes up:
- "How many kg is X pounds?" — the most common form; use the calculator above for any X.
- "pounds to kilos" — "kilos" is everyday shorthand for kilograms; same calculation.
- "convert body weight lbs to kg" — common for medical forms, gym trackers, and BMI calculators that use metric units.
- "lb to kg formula" —
kg = lbs × 0.45359237, as shown above. - "stone and pounds to kg" — first convert stone to lbs (1 stone = 14 lbs), add any extra pounds, then multiply by 0.45359237.
- "kg to lbs" — the reverse; switch the toggle in the tool above.
Quick tips and common mistakes
- Lbs vs lb: both are correct abbreviations for pound. "Lbs" is plural but you will see both used for any quantity — they mean the same unit.
- Don't confuse pounds-mass with pounds-force: this tool converts pounds as a unit of weight/mass (the everyday meaning), not the engineering unit "lbf".
- Rounding: the tool gives you 3 decimal places by default. For body weight you usually only need 1 (e.g. 68.0 kg). For shipping or lab work, use the full precision.
- Stone shortcut: if your scale shows stones, remember 1 stone = 14 lbs. Multiply total lbs by 0.45359 as normal.
- Mental-maths shortcut: divide pounds by 2.2 for a close estimate (e.g. 220 lbs ÷ 2.2 = 100 kg). It is off by less than 0.2% — fine for a quick check.
Everything is calculated entirely in your browser. No numbers you enter are sent to any server — your data stays on your device.
Ready to convert? Enter any weight in pounds into the converter at the top of the page and get your kilograms result right away.