Pounds to kg Converter (lbs to kg)
Type pounds or kilograms and see the other straight away. Works with stone and pounds too, and shows the exact formula with your numbers.
Type in either box. Fractions and commas are fine: 1 1/2, ½ or 1,250.
Fractions apply to pounds, ounces and stone.
Very big or tiny numbers switch to it on their own.
Also see: ounces to grams, miles to km, inches to cm, feet to metres, °C to °F and the all-in-one unit converter.
Pounds to kg and kg to pounds tables
| 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 |
| 10 lb | 4.54 kg |
| 15 lb | 6.80 kg |
| 20 lb | 9.07 kg |
| 25 lb | 11.34 kg |
| 30 lb | 13.61 kg |
| 40 lb | 18.14 kg |
| 50 lb | 22.68 kg |
| 60 lb | 27.22 kg |
| 70 lb | 31.75 kg |
| 80 lb | 36.29 kg |
| 90 lb | 40.82 kg |
| 100 lb | 45.36 kg |
| 110 lb | 49.90 kg |
| 120 lb | 54.43 kg |
| 130 lb | 58.97 kg |
| 140 lb | 63.50 kg |
| 150 lb | 68.04 kg |
| 160 lb | 72.57 kg |
| 170 lb | 77.11 kg |
| 180 lb | 81.65 kg |
| 190 lb | 86.18 kg |
| 200 lb | 90.72 kg |
| 220 lb | 99.79 kg |
| 250 lb | 113.40 kg |
| 300 lb | 136.08 kg |
| Kilograms | Pounds |
|---|---|
| 1 kg | 2.20 lb |
| 2 kg | 4.41 lb |
| 3 kg | 6.61 lb |
| 4 kg | 8.82 lb |
| 5 kg | 11.02 lb |
| 7 kg | 15.43 lb |
| 10 kg | 22.05 lb |
| 15 kg | 33.07 lb |
| 20 kg | 44.09 lb |
| 23 kg | 50.71 lb |
| 25 kg | 55.12 lb |
| 30 kg | 66.14 lb |
| 32 kg | 70.55 lb |
| 40 kg | 88.18 lb |
| 50 kg | 110.23 lb |
| 55 kg | 121.25 lb |
| 60 kg | 132.28 lb |
| 65 kg | 143.30 lb |
| 70 kg | 154.32 lb |
| 75 kg | 165.35 lb |
| 80 kg | 176.37 lb |
| 85 kg | 187.39 lb |
| 90 kg | 198.42 lb |
| 95 kg | 209.44 lb |
| 100 kg | 220.46 lb |
| 110 kg | 242.51 lb |
| 120 kg | 264.55 lb |
| 150 kg | 330.69 lb |
Common examples
Body weight
- 150 lb = 68.04 kg
- 70 kg = 154.32 lb
- 70 kg = 11 st 0.32 lb
- 11 st 4 lb = 71.67 kg
- 200 lb = 90.72 kg
Luggage allowance (typical, check your airline)
- 23 kg = 50.71 lb
- 50 lb = 22.68 kg
- 32 kg = 70.55 lb
- 70 lb = 31.75 kg
- 7 kg = 15.43 lb
- 10 kg = 22.05 lb
Gym plates and bars
- 45 lb = 20.41 kg
- 20 kg = 44.09 lb
- 25 kg = 55.12 lb
- 35 lb = 15.88 kg
- 25 lb = 11.34 kg
- 15 kg = 33.07 lb
Babies and pets
- 7 lb 8 oz = 3.40 kg
- 3.5 kg = 7 lb 11.46 oz
- 10 lb = 4.54 kg
- 30 kg = 66.14 lb
How your conversion is worked out
One exact number links pounds and kilograms: 1 lb = 0.45359237 kg.
- 1
The factor
1 lb =0.45359237 kgexact
- 2
Multiply
150 × 0.45359237= 68.0389 kg
- 3
Round it
68.0389 kg≈ 68.04 kg
- 4
Check it back
68.04 ÷ 0.45359237≈ 150 lb
Read more: the formula, a worked example, tables, stone, luggage and gym plates
The formula
kilograms = pounds × 0.45359237
pounds = kilograms ÷ 0.45359237 (about × 2.20462)
pounds from stone = stone × 14 + pounds
pounds and ounces: 1 lb = 16 oz
Worked example
Convert 150 lb to kilograms: 150 × 0.45359237 = 68.0388555, which rounds to 68.04 kg. To check it, go back: 68.0388555 ÷ 0.45359237 = 150 lb.
The other way, 70 kg to pounds: 70 ÷ 0.45359237 = 154.32 lb. In stone that is 154.32 ÷ 14 = 11 stone with 0.32 lb left over, so 11 st 0.32 lb (about 11 st 0 lb).
Kilograms to stone and pounds
| Kilograms | Stone and pounds | Pounds |
|---|---|---|
| 50 kg | 7 st 12.2 lb | 110.2 lb |
| 55 kg | 8 st 9.3 lb | 121.3 lb |
| 60 kg | 9 st 6.3 lb | 132.3 lb |
| 65 kg | 10 st 3.3 lb | 143.3 lb |
| 70 kg | 11 st 0.3 lb | 154.3 lb |
| 75 kg | 11 st 11.3 lb | 165.3 lb |
| 80 kg | 12 st 8.4 lb | 176.4 lb |
| 85 kg | 13 st 5.4 lb | 187.4 lb |
| 90 kg | 14 st 2.4 lb | 198.4 lb |
| 95 kg | 14 st 13.4 lb | 209.4 lb |
| 100 kg | 15 st 10.5 lb | 220.5 lb |
| 110 kg | 17 st 4.5 lb | 242.5 lb |
| 120 kg | 18 st 12.6 lb | 264.6 lb |
Why the number is exact
In 1959 the US, UK, Canada, Australia, New Zealand and South Africa agreed on one international pound of exactly 0.45359237 kg. So the factor isn't a measurement that might change: 1 lb is 0.45359237 kg by definition. The kilogram to pound factor, 2.20462262…, goes on forever because it is 1 ÷ 0.45359237.
Quick ways in your head
- Pounds to kg: halve it, then take off 10% of that. 150 lb → 75 → 75 − 7.5 = 67.5 kg (true answer 68.04).
- Kg to pounds: double it, then add 10% of that. 70 kg → 140 → 140 + 14 = 154 lb (true answer 154.32).
Other weight units
1 pound = 16 ounces = 453.59237 g. 1 stone = 14 lb = 6.35029318 kg. 1 tonne = 1,000 kg = 2,204.62 lb. Gold and silver use troy ounces, which are heavier than everyday ounces; the ounces to grams converter handles them.
Airline baggage limits and gym equipment weights above are typical examples, not rules: always check your airline's allowance, and the weight stamped on the plate or bar.
Common questions
How do I convert pounds to kg?
Multiply the pounds by 0.45359237, the exact number of kilograms in one pound. So 150 lb × 0.45359237 = 68.04 kg. For a quick guess in your head, halve the pounds and take off a tenth of that: 150 ÷ 2 = 75, minus 7.5 = 67.5 kg. Dividing by 2.2046 gives the same answer as multiplying.
How do I convert kg to pounds?
Multiply the kilograms by 2.20462 (more exactly 2.20462262), or divide by 0.45359237. So 70 kg × 2.20462 = 154.32 lb. A quick way in your head: double the kilograms and add a tenth of that, so 70 × 2 = 140, plus 14 = 154 lb.
Is 1 kg exactly 2.2 pounds?
Not quite. One kilogram is 2.20462 pounds. Using 2.2 is about 0.2% low, which is fine for a rough idea but adds up: 100 kg is 220.46 lb, not 220 lb. The pound itself is defined exactly as 0.45359237 kg, so the exact factor is 1 ÷ 0.45359237.
How many kg is a stone?
One stone is 14 pounds, which is exactly 6.35029318 kg. To convert stone and pounds to kg, turn it all into pounds first and then multiply by 0.45359237. For example, 11 st 4 lb is 11 × 14 + 4 = 158 lb, and 158 × 0.45359237 = 71.67 kg.
Is 23 kg the same as 50 lb?
Nearly, but not exactly. 23 kg is 50.71 lb, and 50 lb is 22.68 kg. Many airlines quote a checked bag allowance as 23 kg or 50 lb, so if your bag weighs 50.5 lb it can be under 23 kg but over 50 lb. Check which figure your airline uses.
Why is pounds written lbs?
The short form lb comes from the Latin libra, a Roman unit of weight. People often add an s for more than one (lbs), though lb is correct for both. Since 1959 the international pound has been defined as exactly 0.45359237 kg, so a pound is the same in the US, UK, Canada and Australia.
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