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Pounds to kilograms (lbs to kg)

Convert pounds to kilograms with the exact definition (1 lb = 0.45359237 kg), plus a table from 1 to 250 lb.

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One pound is exactly 0.45359237 kg (international yard and pound agreement, 1959), so kilograms = pounds × 0.45359237 with no rounding in the factor. 150 lb is 68.04 kg, 200 lb is 90.72 kg, and a 50 lb bag limit is 22.68 kg.

You need this when a US doctor, gym app or recipe gives pounds and your scale shows kilograms, or when a courier asks for kilograms and the box is marked in pounds. For pounds and ounces (such as a baby's birth weight of 7 lb 8 oz), convert the ounces to a fraction of a pound first: 8 oz = 0.5 lb, so 7.5 lb = 3.40 kg.

How to use it

  1. Type the value in the first box; the converted value appears in the second box as you type.
  2. Or type in the second box to convert the other way.
  3. Use the Decimals menu to round, and the quick-reference table for common values.

Frequently asked questions

How many kg is 1 lb?

Exactly 0.45359237 kg, or about 454 g.

How do I convert lbs to kg in my head?

Halve the pounds and subtract 10% of the result: 180 lb → 90 − 9 = 81 kg (exact 81.65).

How many kg is 150 lbs?

68.04 kg. The table on this page lists other common body weights.

Is "lbs" a different unit from "lb"?

No. "lb" is the symbol (from the Latin libra); "lbs" is an informal plural. Both mean the avoirdupois pound.

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