Pounds to Kilograms Converter (lb to kg)
1 pound = 0.45359237 kilograms exactly, so to convert pounds to kilograms multiply by 0.45359237 (e.g. 50 lb = 22.68 kg).
Open the pounds to kg calculator →Worked example
A structural steel beam listed at 200 lb is 200 × 0.45359237 = 90.72 kg. A bag of cement weighing 94 lb is 94 × 0.45359237 = 42.64 kg. Type either unit in the Weight tab and the rest update instantly.
Conversion reference
| Pounds | Kilograms |
|---|---|
| 1 lb | 0.4536 kg |
| 10 lb | 4.536 kg |
| 50 lb | 22.68 kg |
| 100 lb | 45.36 kg |
| 500 lb | 226.8 kg |
| 2000 lb (1 short ton) | 907.18 kg |
Pounds and kilograms are the two dominant mass units in construction — imperial drawings and US material specs use pounds, while metric structural calculations and international standards use kilograms. Arch Convert's Build-mode Weight tab shows kilograms, grams, tonnes, pounds, and US short tons together (plus UK long tons, hundredweight, stone, and more via the Units menu), all routed through an exact gram base so round-trip conversions never drift. The pound used is the international avoirdupois pound (0.45359237 kg), standard everywhere since 1959.
Frequently asked
- How many kg is 1 pound?
- One pound is exactly 0.45359237 kilograms (453.59237 grams). This is the international avoirdupois pound, the standard definition used in the US, UK, Canada, Australia, and New Zealand since 1959.
- How do I convert pounds to kilograms?
- Multiply the pound value by 0.45359237 to get kilograms. For a quick estimate, divide by 2.205. For example, 50 lb × 0.45359237 = 22.68 kg. Type the value in Arch Convert's Build-mode Weight tab and the kilogram row updates instantly.
- What is 100 lbs in kg?
- 100 pounds is 45.36 kilograms (100 × 0.45359237 = 45.359237 kg, rounded to 45.36 kg). This is a common reference for material weight estimates on construction sites.