⚖️ Lbs to Kg Converter

Convert pounds to kilograms instantly, both directions.

About this tool

Converts pounds to kilograms using the precise factor 1 lb = 0.45359237 kg, the internationally defined value rather than a rounded shortcut.

Handy for reading a US bathroom scale against a metric target weight, converting shipping weights, or following a recipe written in kilograms.

Worked example

200 lb converts to about 90.72 kg, and 90 kg converts back to about 198.42 lb.

How to use it

Enter a value in pounds.
The kilogram equivalent appears immediately.
Swap direction to go from kilograms back to pounds.

Tips

1 lb is a little under half a kilogram — a fast mental estimate is to halve the pound figure and subtract about 10%.
Shipping carriers often bill by kilogram even for US senders; check before you're surprised at checkout.
Pair this with the BMI Calculator if you're converting weight for a health metric.

FAQ

What's the exact conversion factor?

1 pound equals exactly 0.45359237 kilograms — that's the legally defined international avoirdupois pound.

Is there a quick mental shortcut?

Roughly: kg ≈ lb × 0.45, or halve the pounds and trim about 10% off for a fast estimate.

Does this handle decimals?

Yes — enter values like 154.5 and it converts with full precision.

From the blog: getting the most out of this tool

Pounds-to-kilograms is the mirror image of our most-requested conversion, so we gave it the same dedicated treatment: type a number, get an answer, no extra steps.

If you need a range of values at once, scroll down to the quick reference table — it's built from the exact same formula so it never drifts out of sync with the calculator above.

📖 Want the fuller explanation?

See Metric vs Imperial Units for the reasoning behind this calculation, with worked examples.