The pound (US/UK customary) and the kilogram (metric) both have exact definitions, making this a precise weight conversion.
How it works
Multiplying pounds by 0.45359237 gives kilograms; dividing kilograms by that same constant gives pounds back. Type into either field and the other updates instantly.
What this does not include
This does not include the UK stone (14 pounds) — this calculator converts directly between pounds and kilograms only.
How to use this calculator
- Enter a value in either pounds or kilograms — the other field fills in automatically.
Frequently asked questions
Is this the same conversion as the site’s kg-to-lbs calculator?
Yes, functionally identical — this version leads with pounds first, for anyone specifically searching “lbs to kg” rather than “kg to lbs.”
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 from a different country’s measurement system.
