Convert pounds to kilograms

Formula: kg = lbs × 0.453592

lbs to kg quick reference table

Everyday lbs values, converted

• 45 lbs = 20.4117 kg — a men's Olympic barbell in pounds.
• 50 lbs = 22.6796 kg — the US airline checked-bag limit.
• 150 lbs = 68.0389 kg — a common adult body-weight reference.
• 10 lbs = 4.5359 kg — a pair of hand weights.

Where lbs to kg comes up

Weight conversions show up at the gym, at the airline check-in desk, in recipes written for another country and at the doctor's office. Scales in one country are almost never labelled in the other country's unit, which is why the same figure has to be converted repeatedly.

Doing lbs to kg in your head

Halve the number, then take off 10%. 150 halved is 75, minus 7.5 gives 67.5 against an exact 68.04.

Precision and rounding

One pound is exactly 0.453592 kilograms under the current definitions of both units, so the only judgement call is how many digits you keep. Two decimal places is already finer than most household scales and tape measures can read, while engineering and medical work usually keeps the full factor and rounds once at the end rather than at every step.