Weight and Mass / lb → oz
Convert Pounds to Ounces
Compare mass in kilograms, pounds, grams, and ounces. Pounds and ounces use avoirdupois definitions. Convert Pounds (lb) to Ounces (oz). Find the formula, worked examples, unit definitions, and practical guidance below.
How to convert pounds to ounces
These units measure mass. Converting recipe weights to cups requires an ingredient-specific density; the same volume of flour and water will not have the same mass.
Use x for the value in lb, b for the intermediate value in kg, and y for the result in oz.
oz = lb × 0.45359237 ÷ 0.028349523125
Worked examples
10 lb ≈ 160 oz
Step 1: (10 × 0.45359237) ≈ 4.5359237 kg.
Step 2: 4.5359237 ÷ 0.028349523125 ≈ 160 oz.20 lb ≈ 320 oz
Step 1: (20 × 0.45359237) ≈ 9.0718474 kg.
Step 2: 9.0718474 ÷ 0.028349523125 ≈ 320 oz.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Pounds
The international avoirdupois pound is exactly 0.45359237 kilograms and contains 16 avoirdupois ounces. It is not a troy pound.
About Ounces
An avoirdupois ounce is one sixteenth of an avoirdupois pound. It measures mass; a fluid ounce measures volume, and a troy ounce is a different mass unit.
Definitions and sources
Use mass units consistently
Pounds and ounces here are avoirdupois units: 16 ounces make one pound. Enter 8 pounds 8 ounces as 8.5 pounds, rather than 8.8 pounds. Precious metals may use troy ounces, which are not included here.
A weight conversion preserves mass. It cannot tell you how many cups an ingredient fills without knowing its density and how it was measured. Use a kitchen scale when a recipe specifies mass.
Keeping ingredients in the same mass unit also makes it easier to compare quantities in recipe calculations.
Pounds to ounces reference table
| Pounds (lb) | Ounces (oz) |
|---|---|
| 1 | 16 |
| 5 | 80 |
| 10 | 160 |
| 25 | 400 |
| 50 | 800 |
| 100 | 1600 |
| 1000 | 16000 |
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