Pounds to Ounces Converter — lb to oz
Convert any weight in pounds to ounces in one click — decimal pounds like 2.5 lb work too. Also converts to grams, kilograms and stones automatically.
lb
5 lb = 80 oz (1 lb = 16 oz)
- 1
Conversion factor
161 pound = 16 avoirdupois ounces (exact definition). - 2
Ounces = Pounds × 16
5 × 16 = 80
How does this calculator work?
Multiply pounds by 16 to get ounces: oz = lb × 16. One pound = 16 oz = 453.6 g ≈ 0.0714 stone. Enter any decimal pound value to get ounces, grams, kilograms and stones instantly.
Formula
How this is calculated
The international avoirdupois pound is defined as exactly 0.453 592 37 kilograms, and one pound contains exactly 16 avoirdupois ounces. This gives 1 oz = 453.592 37 ÷ 16 = 28.349 523 125 g — an exact, legally defined conversion constant.
The calculator multiplies your pound input by 16 to get ounces, and by 453.592 37 to get grams (then divides by 1000 for kilograms). It also converts to the UK stone unit (1 stone = 14 lb) by dividing pounds by 14 and taking the floor for whole stones, with the fractional pound remainder shown separately.
Note: these are all units of mass, not force. The ounce here is the avoirdupois ounce — distinct from the fluid ounce (a volume unit, ≈ 29.57 mL in the US system) and the troy ounce (31.103 g, used for precious metals). Do not mix them up.
Frequently asked questions
There are exactly 16 avoirdupois ounces in one pound. This is the standard ounce used for everyday goods in the United States and United Kingdom. The troy ounce (used for gold and silver) is heavier at 31.103 g; a troy pound has 12 troy ounces and weighs only 373.24 g.
2.5 lb × 16 = 40 oz. Enter 2.5 in the calculator — it handles decimal pounds automatically and also shows the result in grams and kilograms.
An ounce (oz) is a unit of mass ≈ 28.35 g. A fluid ounce (fl oz) is a unit of volume ≈ 29.57 mL in the US system (slightly different in the UK). They measure different things — you cannot convert between them without knowing the density of the substance.
Also known as
TG we-Calculate Editorial Team. (2026). Pounds to Ounces Converter — lb to oz [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/pounds-to-ounces-converter
TG we-Calculate Editorial Team. "Pounds to Ounces Converter — lb to oz." TG we-Calculate. 2026. https://we-calculate.com/calculator/pounds-to-ounces-converter.
TG we-Calculate Editorial Team, "Pounds to Ounces Converter — lb to oz," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/pounds-to-ounces-converter
@misc{wecalculate_pounds_to_ounces_converter, title = {Pounds to Ounces Converter — lb to oz}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/pounds-to-ounces-converter}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?