Pounds to Ounces Converter

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Convert pounds to ounces using the imperial avoirdupois relation 1 lb = 16 oz. A 5-lb bag of flour is 80 oz; a 3.5-lb roast is 56 oz. Practical for splitting bulk-pound retail packs into per-portion ounce weights, and for breaking down USPS pound-rate parcels into the ounce slabs of First-Class Mail pricing. Browser-local conversion.

Pound (lb)
Ounce (oz)

Pound (lb) → Ounce (oz)

Quick reference table

Pound (lb)Ounce (oz)
1 lb16 oz
2 lb32 oz
5 lb80 oz
10 lb160 oz
25 lb400 oz
50 lb800 oz
100 lb1600 oz

Glossary

Pound (lb)

A pound (avoirdupois) is exactly 0.45359237 kg by the international 1959 yard-and-pound agreement. It is the everyday US/UK unit for body weight, groceries, gym plates and shipping. Sixteen ounces make one pound; fourteen pounds make one stone (UK only). The symbol "lb" comes from Latin "libra".

Ounce (oz)

An ounce (avoirdupois) is one sixteenth of a pound, defined as exactly 28.349523125 g since 1959. It is the dominant unit for US food packaging, beverages, postal letters and personal-care products. One fluid ounce of water at 4 °C weighs almost exactly one avoirdupois ounce — a coincidence that helped the unit survive in modern US recipes.

Metric system (SI)

The metric system is a decimal system of measurement built around the kilogram for mass, the meter for length and the second for time, with multiples and submultiples expressed as powers of ten (milligram, gram, tonne). Adopted in France in 1799 and codified internationally as the International System of Units (SI) in 1960, it is now the official system in nearly every country and the standard in science.

Imperial / US Customary system

The imperial system is the historical English system of weights and measures whose mass units are the ounce, pound, stone and ton (16 oz = 1 lb, 14 lb = 1 stone, 2,000 lb = 1 US short ton). Codified by the British Weights and Measures Act of 1824 and aligned with US Customary by the 1959 international yard-and-pound agreement (1 lb = 0.45359237 kg exactly), it is still used in the United States and the United Kingdom for everyday weights.

Related tools

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