1 kilogram = 2.205 pounds
Convert kilograms to pounds with an exact, internationally defined factor — si base unit.
kilograms to pounds
Computed with the exact factor · NIST SP 811
| Kilogram | Pound |
|---|---|
| 0.5 kg | 1.102 lb |
| 1 kg | 2.205 lb |
| 2 kg | 4.409 lb |
| 3 kg | 6.614 lb |
| 5 kg | 11.02 lb |
| 10 kg | 22.05 lb |
| 25 kg | 55.12 lb |
| 50 kg | 110.23 lb |
| 100 kg | 220.46 lb |
Exact factor details
- Exact factor
- 1 kg = 2.205 lb (exact definition)
- Significant digits
- up to 4 significant digits shown
- Data source
- NIST SP 811 — verified against official tables
Why kg to lb trips people up
Weight and mass conversions between kilograms, pounds, and ounces. The avoirdupois pound has been defined as exactly 0.45359237 kilograms since 1959, so these conversions are exact by international agreement. The kilogram is the SI base unit of mass, defined by the Planck constant since 2019. The avoirdupois pound is exactly 0.45359237 kilograms by international agreement.
In everyday use, pound and kilogram are compared directly, though the pound is technically a unit of mass in the avoirdupois system. For cooking, gym training, and shipping the distinction does not matter — the exact definition keeps every conversion consistent. Ounces and grams are linked through the same definition: one ounce is exactly 28.349523125 grams.
Use the quick-reference table for the amounts people actually look up, and the converter above for everything in between. Both are computed from the same factor at full precision, so the table and the converter can never disagree — there is no second, rounded copy of the data anywhere on this page.
Frequently asked questions
Is the kg to lb conversion exact?
Yes. SI base unit and 1 lb = 0.45359237 kg (exact) are exact definitions, so the conversion is exact — results are rounded only for readability.
How do I convert kg to lb in my head?
Multiply kilograms by 2.2 — 70 kg is about 154 lb.
Why do other sites show slightly different kg to lb results?
They round at different steps. This page computes with the full-precision factor and rounds only the final displayed number, so small trailing digits can differ from sites that round earlier.