Weight converter
Pounds to Kilograms
Converting Pounds to Kilograms is a single multiplication when you know the factor. One lb equals 0.45359237 kg, so multiply the value in lb by 0.45359237. The calculator below works in both directions and accepts decimals.
Formula 1 lb = 0.45359237 kg
Need the other direction? Kilograms to Pounds.
How to convert Pounds to Kilograms
The international avoirdupois pound is exactly 0.45359237 kilograms. The kilogram is the SI base unit of mass; since 2019 it is defined by the Planck constant.
To convert Pounds to Kilograms, multiply the value in lb by 0.45359237. For example, 10 lb × 0.45359237 = 4.535924 kg. This works because the ratio between the two units is constant for every value in weight.
Worked examples
| lb | kg |
|---|---|
| 1 lb | 0.45359237 kg |
| 2.5 lb | 1.133981 kg |
| 5 lb | 2.267962 kg |
| 10 lb | 4.535924 kg |
| 25 lb | 11.339809 kg |
| 50 lb | 22.679619 kg |
| 100 lb | 45.359237 kg |
Reverse conversion
| kg | lb |
|---|---|
| 1 kg | 2.204623 lb |
| 5 kg | 11.023113 lb |
| 10 kg | 22.046226 lb |
| 25 kg | 55.115566 lb |
| 50 kg | 110.231131 lb |
| 100 kg | 220.462262 lb |
When this conversion is useful
This is the calculation you need when you are comparing body weight, shipping weight or a recipe across metric and imperial units. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 lb is 453.59237 kg.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
lb to kg conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.45359237 kg |
| 2 lb | 0.90718474 kg |
| 3 lb | 1.360777 kg |
| 4 lb | 1.814369 kg |
| 5 lb | 2.267962 kg |
| 6 lb | 2.721554 kg |
| 7 lb | 3.175147 kg |
| 8 lb | 3.628739 kg |
| 9 lb | 4.082331 kg |
| 10 lb | 4.535924 kg |
| 11 lb | 4.989516 kg |
| 12 lb | 5.443108 kg |
| 13 lb | 5.896701 kg |
| 14 lb | 6.350293 kg |
| 15 lb | 6.803886 kg |
| 16 lb | 7.257478 kg |
| 17 lb | 7.71107 kg |
| 18 lb | 8.164663 kg |
| 19 lb | 8.618255 kg |
| 20 lb | 9.071847 kg |
| 21 lb | 9.52544 kg |
| 22 lb | 9.979032 kg |
| 23 lb | 10.432625 kg |
| 24 lb | 10.886217 kg |
| 25 lb | 11.339809 kg |
| 26 lb | 11.793402 kg |
| 27 lb | 12.246994 kg |
| 28 lb | 12.700586 kg |
| 29 lb | 13.154179 kg |
| 30 lb | 13.607771 kg |
| 31 lb | 14.061363 kg |
| 32 lb | 14.514956 kg |
| 33 lb | 14.968548 kg |
| 34 lb | 15.422141 kg |
| 35 lb | 15.875733 kg |
| 36 lb | 16.329325 kg |
| 37 lb | 16.782918 kg |
| 38 lb | 17.23651 kg |
| 39 lb | 17.690102 kg |
| 40 lb | 18.143695 kg |
| 41 lb | 18.597287 kg |
| 42 lb | 19.05088 kg |
| 43 lb | 19.504472 kg |
| 44 lb | 19.958064 kg |
| 45 lb | 20.411657 kg |
| 46 lb | 20.865249 kg |
| 47 lb | 21.318841 kg |
| 48 lb | 21.772434 kg |
| 49 lb | 22.226026 kg |
| 50 lb | 22.679619 kg |
| 60 lb | 27.215542 kg |
| 70 lb | 31.751466 kg |
| 80 lb | 36.28739 kg |
| 90 lb | 40.823313 kg |
| 100 lb | 45.359237 kg |
Frequently asked questions
How many Kilograms are in 1 Pounds?
1 lb equals 0.45359237 kg.
How do I convert Pounds to Kilograms?
Multiply the lb value by 0.45359237. Example: 25 lb = 11.339809 kg.
What is 2.5 lb in kg?
2.5 lb = 1.133981 kg.
Is the lb to kg conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.