Free · Weight and mass converters

Pounds to lb or lbs: Same Mass Unit

Confirm that pounds, lb and the common spelling lbs denote the same mass quantity, with no scale factor between them.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

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25 pounds is 25 lb. The abbreviation changes how the amount is written, not its value.

Amount in lb = amount in pounds

Enter these known values and leave the other values blank.

Both fields refer to the same avoirdupois mass unit. One pound is exactly 0.45359237 kg.
This is a notation conversion. It does not convert pound-mass to pound-force or change the amount into kilograms.
Nonnegative mass amounts are accepted, including zero.

It comes from the Latin word libra. In unit notation, lb is used for both singular and plural amounts.

No. It is a common pluralized abbreviation for pounds. The numerical amount stays unchanged.

Bookify requires nonnegative quantities for this geometric or mass-amount conversion.