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Convert between pounds, kilograms, grams, ounces, stones, and milligrams with live updates.
Weight is the force exerted on an object by gravity, while mass is the amount of matter in an object. Common units include pounds, kilograms, grams, ounces, and stones.
| Pounds | Kilograms | Common Use |
|---|---|---|
| 1 lb | 0.454 kg | - |
| 5 lb | 2.268 kg | Bag of flour |
| 10 lb | 4.536 kg | Bowling ball |
| 50 lb | 22.68 kg | Checked luggage |
| 100 lb | 45.36 kg | - |
| 150 lb | 68.04 kg | Adult weight |
| 200 lb | 90.72 kg | Adult weight |
Multiply the number of pounds by 0.453592 to get kilograms.
kg = lb × 0.453592
Multiply the number of kilograms by 2.20462 to get pounds.
lb = kg × 2.20462
For rough estimates: double the kg and add 10% to get pounds, or halve the pounds and subtract 10% for kg.
Formula
kg = lb × 0.453592 | lb = kg × 2.20462kg = kilogram — SI base unit of mass (1 kg = 1,000 g)
lb = pound (avoirdupois) — US/UK customary unit (1 lb = 16 oz = 0.453592 kg)
st = stone — UK unit for body weight (1 st = 14 lb = 6.35029 kg)
Worked Example
Convert 175 lbs to kilograms
Did you know? The kilogram was redefined in 2019 by the BIPM in terms of Planck's constant (h = 6.626×10⁻³⁴ J·s), replacing the last physical artifact standard — a platinum-iridium cylinder kept in a vault near Paris since 1889.
Sources
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