Enter any value in pounds and read the result in kilograms immediately. The converter is useful wherever weight is expressed in pounds: in fitness apps from the US, when buying sports equipment, interpreting airline baggage limits, or reading a newborn's weight from English-language medical records.
The pound (lb) is the unit of mass in the imperial system, common in the US and still widely used in the UK. In continental Europe and most of the world, the kilogram is the everyday unit, so pounds appear mainly when you use products, apps or information from English-speaking countries.
The most common situations: a fitness app from the US shows your weight goal in pounds, the checked baggage limit is 50 lb, you are buying dumbbells on Amazon US labelled in pounds, or a YouTube training programme tells you to bench 135 lb.
The formula is simple: one pound is exactly 0.45359237 kg. To convert pounds to kilograms, multiply by 0.4536. The converter does this the moment you type a value.
On this page you will find a lb to kg table, a body weight table with conversions of common values, and a gym weights table.
Converting pounds to kilograms is based on a fixed definition: one pound equals exactly 0.45359237 kg. To convert pounds to kilograms, multiply the number of pounds by 0.45359237.
Full formula: kilograms = pounds × 0.4536. The other way: pounds = kilograms × 2.2046.
Example: you want to know how many kilograms 150 lb is (a weight shown in a US app). Calculation: 150 × 0.4536 = 68.04 kg. Another example: a 50 lb baggage limit is 50 × 0.4536 = 22.68 kg.
Quick estimate without a calculator: divide pounds by 2.2. For example: 150 lb ÷ 2.2 ≈ 68.2 kg — the error is less than 0.2%. Another method: multiply by 0.45, which gives an error of less than 0.1%.
The table below converts common pound values to kilograms, rounded to two decimal places. To convert an exact value, use the converter above.
| Pounds (lb) | Kilograms |
|---|---|
| 1 lb | 0.45 kg |
| 2 lb | 0.91 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 |
| 115 lb | 52.16 kg |
| 120 lb | 54.43 kg |
| 125 lb | 56.70 kg |
| 130 lb | 58.97 kg |
| 135 lb | 61.24 kg |
| 140 lb | 63.50 kg |
| 145 lb | 65.77 kg |
| 150 lb | 68.04 kg |
| 160 lb | 72.57 kg |
| 165 lb | 74.84 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 |
Want to convert the other way? Use our <a href="/en/tools/kg-to-lb-converter">kg to lb converter</a>, which has its own table and detailed content for that direction.
The table below converts typical body weight ranges from pounds to kilograms, covering values from 88 lb to 265 lb, which corresponds to approximately 40 kg to 120 kg.
| Body weight (lb) | Kilograms |
|---|---|
| 88 lb | 39.92 kg |
| 99 lb | 44.91 kg |
| 110 lb | 49.90 kg |
| 121 lb | 54.88 kg |
| 132 lb | 59.87 kg |
| 143 lb | 64.86 kg |
| 154 lb | 69.85 kg |
| 165 lb | 74.84 kg |
| 176 lb | 79.83 kg |
| 187 lb | 84.82 kg |
| 198 lb | 89.81 kg |
| 209 lb | 94.80 kg |
| 220 lb | 99.79 kg |
| 231 lb | 104.78 kg |
| 242 lb | 109.77 kg |
| 265 lb | 120.20 kg |
Gym equipment made in the US is labelled in pounds. The table below converts standard loads — from light dumbbells to an Olympic barbell and popular powerlifting benchmarks.
| Weight (lb) | Kilograms |
|---|---|
| 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 |
| 35 lb | 15.88 kg |
| 40 lb | 18.14 kg |
| 45 lb | 20.41 kg |
| 50 lb | 22.68 kg |
| 55 lb | 24.95 kg |
| 65 lb | 29.48 kg |
| 95 lb | 43.09 kg |
| 100 lb | 45.36 kg |
| 135 lb | 61.24 kg |
| 185 lb | 83.91 kg |
| 225 lb | 102.06 kg |
Converting pounds to kg comes up in several everyday situations.
One pound is exactly 0.45359237 kg. This is a fixed constant, established in 1959 as the international avoirdupois pound. Rounded: 1 lb = 0.454 kg.
The formula is: kilograms = pounds × 0.45359237. Rounded: kg = lb × 0.4536. For example: 150 lb × 0.4536 = 68.04 kg. The other way: lb = kg × 2.2046.
150 lb is 68.04 kg. Calculation: 150 × 0.45359 = 68.04. This is a common body weight in the US, frequently quoted in women's health calculators.
140 lb is 63.50 kg. Calculation: 140 × 0.45359 = 63.50. This is one of the most frequently converted body weight values in US health calculators and training plans.
180 lb is 81.65 kg. Calculation: 180 × 0.45359 = 81.65. Quick mental check: 180 ÷ 2.2 ≈ 81.8 kg, so the result adds up.
50 lb is 22.68 kg. This is the standard checked baggage weight limit on many US airlines.
130 lb is 58.97 kg. Calculation: 130 × 0.45359 = 58.97. Rounded: 130 pounds is just under 59 kg.
No — 2 pounds is 0.907 kg, which is more than 9% short of a kilogram. Exactly 1 kg corresponds to 2.2046 lb. The '2 pounds = 1 kg' shortcut can be handy for rough estimates, but the absolute error grows quickly with larger values: 100 lb is not 50 kg but 45.36 kg.
Quick method: divide pounds by 2.2. For example: 150 lb ÷ 2.2 ≈ 68.2 kg (exact value: 68.04 kg). The error is less than 0.3%. Another method: multiply by 0.45, giving an error of less than 0.1%.
135 lb is 61.24 kg. In gym culture, '135 on the bench' is a popular milestone: a 45 lb barbell plus two 45 lb plates makes exactly 135 lb. The closest metric setup — a 20 kg barbell plus two 20 kg plates — is 60 kg, or 132.3 lb, so slightly less.
No — a pound (lb) and an ounce (oz) are two different units. 1 pound = 16 ounces. One ounce is about 28.35 g, and one pound is about 453.6 g (0.4536 kg). Baby weights are often given in pounds and ounces, e.g. '7 lb 11 oz'.
165 lb is 74.84 kg. Calculation: 165 × 0.45359 = 74.84. Rounded: 165 pounds is just under 75 kg.
225 lb is 102.06 kg. In gym culture, '225 on the bench' is a symbol of serious strength and a popular training milestone: a 45 lb barbell plus four 45 lb plates (two per side) makes exactly 225 lb. In kilograms that is just over 102 kg.
Americans state body weight in pounds (lb), while British people commonly use stone and pounds (1 stone = 14 lb), for example '11 stone 4'. Most other countries use kilograms. In medicine, kilograms dominate even in English-speaking countries, because many drug doses are calculated per kilogram of body weight (mg/kg).
23 kg is 23 × 2.2046 = 50.71 lb, approximately 50 lb. That is why European airlines often state a 23 kg limit while US carriers say 50 lb — they are almost the same. The difference is 0.71 lb, or about 320 grams.
60 lb is 27.22 kg. Calculation: 60 × 0.45359 = 27.22. In the US this is also the standard weight of a bag of dry concrete mix, which is why the value often comes up in construction and DIY projects.
If you notice an error in the tables or have an idea for improving the converter, write to us. We reply to every message.
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