Converting between kilograms and pounds is one of the most common unit conversions — whether you're checking a luggage weight limit, reading a fitness article, or following a recipe from another country.
The Exact Conversion Factor
1 kilogram = 2.20462 pounds
1 pound = 0.453592 kilograms
The Formulas
Kilograms to pounds:
lbs = kg × 2.20462
Pounds to kilograms:
kg = lbs ÷ 2.20462
or equivalently:
kg = lbs × 0.453592
Quick Mental Maths Tricks
Kilograms to Pounds
Method 1: Double + 10% Multiply by 2, then add 10% of the result.
70 kg → 70 × 2 = 140 → add 10% = 14 → 140 + 14 = 154 lbs
Exact: 70 × 2.20462 = 154.32 lbs. The mental method gives 154 — close enough.
Method 2: Multiply by 2.2 For a quick estimate, multiply by 2.2 instead of 2.20462.
80 kg × 2.2 = 176 lbs (exact: 176.37 lbs)
Pounds to Kilograms
Divide by 2.2 (or divide by 2 and subtract 10%):
200 lbs ÷ 2.2 ≈ 90.9 kg
or: 200 ÷ 2 = 100, subtract 10% = 10, result = 90 kg
Conversion Table: Common Weights
| Kilograms | Pounds | Context |
|---|---|---|
| 1 kg | 2.2 lbs | — |
| 5 kg | 11.0 lbs | Bag of flour |
| 10 kg | 22.0 lbs | Cabin bag limit |
| 23 kg | 50.7 lbs | Standard checked luggage |
| 30 kg | 66.1 lbs | Large suitcase limit |
| 50 kg | 110.2 lbs | Light person |
| 60 kg | 132.3 lbs | Average woman |
| 70 kg | 154.3 lbs | Average man (UK) |
| 80 kg | 176.4 lbs | — |
| 90 kg | 198.4 lbs | — |
| 100 kg | 220.5 lbs | — |
| 120 kg | 264.6 lbs | — |
| 150 kg | 330.7 lbs | — |
| 200 kg | 440.9 lbs | — |
Extended Table: 1 kg to 100 kg
| kg | lbs | kg | lbs | kg | lbs | kg | lbs |
|---|---|---|---|---|---|---|---|
| 1 | 2.2 | 26 | 57.3 | 51 | 112.4 | 76 | 167.6 |
| 2 | 4.4 | 27 | 59.5 | 52 | 114.6 | 77 | 169.8 |
| 3 | 6.6 | 28 | 61.7 | 53 | 116.8 | 78 | 172.0 |
| 4 | 8.8 | 29 | 63.9 | 54 | 119.0 | 79 | 174.2 |
| 5 | 11.0 | 30 | 66.1 | 55 | 121.3 | 80 | 176.4 |
| 6 | 13.2 | 31 | 68.3 | 56 | 123.5 | 81 | 178.6 |
| 7 | 15.4 | 32 | 70.5 | 57 | 125.7 | 82 | 180.8 |
| 8 | 17.6 | 33 | 72.8 | 58 | 127.9 | 83 | 183.0 |
| 9 | 19.8 | 34 | 74.9 | 59 | 130.1 | 84 | 185.2 |
| 10 | 22.0 | 35 | 77.2 | 60 | 132.3 | 85 | 187.4 |
| 11 | 24.3 | 36 | 79.4 | 61 | 134.5 | 86 | 189.6 |
| 12 | 26.5 | 37 | 81.6 | 62 | 136.7 | 87 | 191.8 |
| 13 | 28.7 | 38 | 83.8 | 63 | 138.9 | 88 | 194.0 |
| 14 | 30.9 | 39 | 86.0 | 64 | 141.1 | 89 | 196.2 |
| 15 | 33.1 | 40 | 88.2 | 65 | 143.3 | 90 | 198.4 |
| 16 | 35.3 | 41 | 90.4 | 66 | 145.5 | 91 | 200.6 |
| 17 | 37.5 | 42 | 92.6 | 67 | 147.7 | 92 | 202.8 |
| 18 | 39.7 | 43 | 94.8 | 68 | 149.9 | 93 | 205.0 |
| 19 | 41.9 | 44 | 97.0 | 69 | 152.1 | 94 | 207.2 |
| 20 | 44.1 | 45 | 99.2 | 70 | 154.3 | 95 | 209.4 |
| 21 | 46.3 | 46 | 101.4 | 71 | 156.5 | 96 | 211.6 |
| 22 | 48.5 | 47 | 103.6 | 72 | 158.7 | 97 | 213.8 |
| 23 | 50.7 | 48 | 105.8 | 73 | 160.9 | 98 | 216.1 |
| 24 | 52.9 | 49 | 108.0 | 74 | 163.1 | 99 | 218.3 |
| 25 | 55.1 | 50 | 110.2 | 75 | 165.3 | 100 | 220.5 |
Common Conversions to Memorise
These are worth remembering:
| Weight | Equivalent |
|---|---|
| 45 kg | 100 lbs |
| 50 kg | 110 lbs |
| 68 kg | 150 lbs |
| 90 kg | 198 lbs ≈ 200 lbs |
| 100 kg | 220 lbs |
Stones: The UK Convention
In the UK, body weight is often expressed in stones and pounds. There are 14 pounds in a stone.
1 stone = 14 pounds = 6.35 kg
| Stones | Pounds | Kilograms |
|---|---|---|
| 7 st | 98 lbs | 44.5 kg |
| 8 st | 112 lbs | 50.8 kg |
| 9 st | 126 lbs | 57.2 kg |
| 10 st | 140 lbs | 63.5 kg |
| 11 st | 154 lbs | 69.9 kg |
| 12 st | 168 lbs | 76.2 kg |
| 13 st | 182 lbs | 82.6 kg |
| 14 st | 196 lbs | 88.9 kg |
| 15 st | 210 lbs | 95.3 kg |
Why Two Systems Exist
The kilogram is the SI (metric) unit of mass, used almost everywhere in the world for science and everyday life. The pound originated in the Roman libra — the Roman unit of weight — and is still the primary weight unit in the USA and, for body weight, in the UK.
The USA never adopted the metric system despite several attempts, making kg-to-lbs conversions permanently necessary for anyone working across both systems.