The kilogram (metric) and the pound (US/UK customary) both have exact definitions, making this a precise weight conversion.
How it works
Multiplying kilograms by 2.20462262185 gives pounds; dividing pounds by that same constant gives kilograms back. Type into either field and the other updates instantly.
What this does not include
This does not include the stone (a UK unit equal to 14 pounds) — this calculator converts directly between kilograms and pounds only.
How to use this calculator
- Enter a value in either kilograms or pounds — the other field fills in automatically.
Frequently asked questions
Why is 1 pound exactly 0.45359237 kg?
It’s the exact international definition set by a 1959 agreement standardizing the avoirdupois pound.
Where is this conversion most commonly needed?
Body weight, luggage weight limits, and reading product weights or nutrition labels from a different country’s measurement system.
Is a UK “stone” the same as a pound?
No — a stone equals 14 pounds; this calculator handles the kilogram-to-pound conversion directly, not the stone.
