ConvBolt — Unit ConverterPounds to Kilograms Converter
Converting pounds to kilograms is a multiplication by a fixed factor: 1 lb = 0.4535924 kg. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one pound works out to 0.4535924 kg, the kilogram is the much smaller unit of the two: a figure given in kilogram always carries a smaller number than the same measurement in pound. A chart drawn in lb can hide that, so check which label the axis uses before you compare two readings.
Where a legal or postal limit is set in kilograms, the same limit expressed in pounds has to be exact — an overshoot of even one unit can change the chargeable band.
The conversion factor used here is 0.4535924 kg per pound (7 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 lb a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 2.204623 lb per kg, the exact reciprocal, so a round trip through both pages returns your original number.
Pounds to Kilograms formula
Use this formula to convert any pound value to kilograms:
Worked example: 100 lb × 0.4535924 = 45.35924 kg.
Pounds to Kilograms conversion table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 0.5 lb | 0.2267962 kg |
| 1 lb | 0.4535924 kg |
| 2 lb | 0.9071847 kg |
| 5 lb | 2.267962 kg |
| 10 lb | 4.535924 kg |
| 20 lb | 9.071847 kg |
| 50 lb | 22.67962 kg |
| 100 lb | 45.35924 kg |
| 500 lb | 226.7962 kg |
| 1000 lb | 453.5924 kg |
How to convert pounds to kilograms
Multiply the pound value by 0.4535924 to get the equivalent in kilograms. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Kilograms to Pounds converter instead of dividing by hand; both pages use the same source factors. For every other lb conversion in one place, see the lb conversion hub.
Frequently asked questions
How many kilograms are in 1 pound?
1 pound = 0.4535924 kg.
What is 100 pounds in kilograms?
100 lb = 45.35924 kg.
Is converting pounds to kilograms the same as kilograms to pounds?
No — the direction changes the multiplier. The reverse conversion (1 kg = 2.204623 lb) is on the Kilograms to Pounds page.
Related conversions
Try the ConvBolt Unit Converter for any other weight unit, browse the Weight conversions, or read our conversion guides.