Pounds to Kilograms Converter
1 pound (lb) equals 0.45359237 kilograms (kg).
Quick answer
To convert pounds to kilograms, multiply by 0.45359237 (exact), or divide by 2.2046. A quick estimate: halve the pounds and take off 10%: 180 lb → 90 − 9 = 81 kg (exact 81.6).
- 1 pound = 0.45359237 kilograms
- 1 kilogram = 2.204622622 pounds
- Formula: kg = lb × 0.45359237
- Quick estimate: halve it, then subtract 10%: 200 lb → 100 − 10 = 90 kg (exact 90.7).
1 pound = 0.45359237 kilograms
How to convert pounds to kilograms
kg = lb × 0.45359237
To convert pounds to kilograms, multiply the number of pounds by 0.45359237.
Example: 42 lb to kg
- Start with the value in pounds: 42 lb.
- Multiply by 0.45359237: 42 × 0.45359237 = 19.05087954.
- Result: 42 pounds = 19.05087954 kilograms.
Going the other way, 1 kilogram = 2.20462262185 pounds, so to convert kilograms back to pounds you divide by the same number. See kilograms to pounds.
Where the conversion factor comes from
The international avoirdupois pound is defined as exactly 0.45359237 kilograms, fixed by the 1959 international yard and pound agreement between the US, UK, Canada, Australia, New Zealand and South Africa. So 1 kg = 1 ÷ 0.45359237 = 2.20462262… pounds.
The kilogram itself has been defined since 2019 by fixing the Planck constant, replacing the platinum-iridium cylinder kept near Paris since 1889.
Mental math: lb to kg in your head
Halve it, then subtract 10% of the result. 150 lb → 75 → 75 − 7.5 = 67.5 kg (exact 68.0). It runs about 1% low; add a little for more accuracy.Or divide by 2.2: 220 lb ÷ 2.2 = 100 kg.
When you need to convert pounds to kilograms
- Converting body weight for doctors, visas and fitness apps.
- Understanding US recipes and packaging.
- Checking luggage weight on a US scale against a kilogram limit.
- Shipping and freight quotes.
Common mistakes
- Dividing by 2 without the correction: 200 lb is 90.7 kg, not 100.
- Mixing pounds (weight) with pounds sterling (currency) in written notes like "£" and "lb".
- Using the troy pound (0.373 kg), which applies only to precious metals.
Everyday pounds in kilograms
| Example | Pounds | Kilograms |
|---|---|---|
| Newborn baby (average) | 7.5 lb | 3.4019 kg |
| Bowling ball (max) | 16 lb | 7.2575 kg |
| Checked bag limit (US airlines) | 50 lb | 22.68 kg |
| Average US woman | 170.8 lb | 77.474 kg |
| Average US man | 199.8 lb | 90.628 kg |
| NFL offensive lineman (typical) | 310 lb | 140.61 kg |
Pounds to kilograms conversion table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 0.1 lb | 0.045359237 kg |
| 0.2 lb | 0.090718474 kg |
| 0.3 lb | 0.136077711 kg |
| 0.4 lb | 0.181436948 kg |
| 0.5 lb | 0.226796185 kg |
| 0.6 lb | 0.272155422 kg |
| 0.7 lb | 0.317514659 kg |
| 0.8 lb | 0.362873896 kg |
| 0.9 lb | 0.408233133 kg |
| 1 lb | 0.45359237 kg |
| 1.5 lb | 0.680388555 kg |
| 2 lb | 0.90718474 kg |
| 2.5 lb | 1.133980925 kg |
| 3 lb | 1.36077711 kg |
| 3.5 lb | 1.587573295 kg |
| 4 lb | 1.81436948 kg |
| 4.5 lb | 2.041165665 kg |
| 5 lb | 2.26796185 kg |
| 6 lb | 2.72155422 kg |
| 7 lb | 3.17514659 kg |
| 7.5 lb | 3.401942775 kg |
| 8 lb | 3.62873896 kg |
| 9 lb | 4.08233133 kg |
| 10 lb | 4.5359237 kg |
| 11 lb | 4.98951607 kg |
| 12 lb | 5.44310844 kg |
| 13 lb | 5.89670081 kg |
| 14 lb | 6.35029318 kg |
| 15 lb | 6.80388555 kg |
| 16 lb | 7.25747792 kg |
| 17 lb | 7.71107029 kg |
| 18 lb | 8.16466266 kg |
| 19 lb | 8.61825503 kg |
| 20 lb | 9.0718474 kg |
| 21 lb | 9.52543977 kg |
| 22 lb | 9.97903214 kg |
| 23 lb | 10.43262451 kg |
| 24 lb | 10.88621688 kg |
| 25 lb | 11.33980925 kg |
| 26 lb | 11.79340162 kg |
More lb to kg values
- 27 lb
- 28 lb
- 29 lb
- 30 lb
- 31 lb
- 32 lb
- 33 lb
- 34 lb
- 35 lb
- 36 lb
- 37 lb
- 38 lb
- 39 lb
- 40 lb
- 41 lb
- 42 lb
- 43 lb
- 44 lb
- 45 lb
- 46 lb
- 47 lb
- 48 lb
- 49 lb
- 50 lb
- 51 lb
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- 53 lb
- 54 lb
- 55 lb
- 56 lb
- 57 lb
- 58 lb
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- 64 lb
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- 67 lb
- 68 lb
- 69 lb
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- 73 lb
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- 75 lb
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- 80 lb
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- 82 lb
- 83 lb
- 84 lb
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- 86 lb
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- 89 lb
- 90 lb
- 91 lb
- 92 lb
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- 99 lb
- 100 lb
- 110 lb
- 120 lb
- 130 lb
- 140 lb
- 150 lb
- 160 lb
- 170 lb
- 180 lb
- 190 lb
- 200 lb
- 210 lb
- 220 lb
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- 250 lb
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- 350 lb
- 360 lb
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- 400 lb
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- 500 lb
- 600 lb
- 700 lb
- 800 lb
- 900 lb
- 1,000 lb
- 1,200 lb
- 1,500 lb
- 2,000 lb
- 2,500 lb
- 3,000 lb
- 4,000 lb
- 5,000 lb
- 10,000 lb
What is a pound?
The pound is the unit of mass used for body weight, food and goods in the United States, and alongside the kilogram in the United Kingdom and Canada.
What is a kilogram?
The kilogram is the base unit of mass in the International System of Units (SI) and the unit used for body weight, food and goods in almost every country.
Convert pounds to other units
Convert other units to kilograms
Frequently asked questions
How many kilograms are in a pound?
One pound is 0.45359237 kilograms.
How many pounds are in a kilogram?
One kilogram is 2.204622622 pounds.
What is the formula to convert pounds to kilograms?
kg = lb × 0.45359237.
How many kg is 150 lbs?
150 lb is 68.04 kg.
How many kg is 200 lbs?
200 lb is 90.72 kg.