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Pounds to kilograms, exact by definition since 1959. The everyday cases: US body weight onto a metric chart, airline baggage allowances, gym plate maths when the bar is loaded in one system and the programme is written in the other, and medication dosing that's specified per kilogram.
Frequently asked questions
What's a quick mental conversion for lbs to kg?
Halve it, then take off 10%: 150 lb → 75 − 7.5 = 67.5 kg (exact: 68.04). Close enough for gym and luggage estimates; use the converter when it needs to be right.
What is a 50 lb airline limit in kilograms?
22.68 kg — which is why metric-facing airlines advertise the same allowance as "23 kg". They round in your favour by a third of a kilo rather than running two different policies.