To convert pounds to ounces, multiply by 16. So 1 lb = 16 oz, 2 lb = 32 oz, and 5 lb = 80 oz. This is an exact definition in the avoirdupois system - no rounding involved.
- Exact: 1 lb = 16 oz - defined, not approximate.
- 1 lb = 16 oz. 2 lb = 32 oz. 5 lb = 80 oz. 10 lb = 160 oz.
- To convert oz back to lb, divide by 16.
- Note: troy pounds (used for precious metals) have 12 troy ounces, not 16.
How to Use This Converter
Type any lbs value in the lb field and the ounces result appears instantly. You can also type in the oz field to convert back to lbs. The conversion is exact: multiply by 16 or divide by 16.
How Do You Convert Pounds to Ounces?
Multiply pounds by 16. In the avoirdupois system (the standard for everyday goods), 1 pound is defined as exactly 16 ounces. There is no rounding.
$$\text{oz} = \text{lb} \times 16$$
Worked examples: 0.5 lb = 8 oz. 1 lb = 16 oz. 1.5 lb = 24 oz. 2 lb = 32 oz. 3 lb = 48 oz. 5 lb = 80 oz. 10 lb = 160 oz.
How Do You Convert Ounces to Pounds?
Divide ounces by 16. See the dedicated ounces to pounds converter for an oz-first reference table.
$$\text{lb} = \text{oz} \div 16$$
Worked examples: 8 oz = 0.5 lb. 24 oz = 1.5 lb. 48 oz = 3 lb. 64 oz = 4 lb.
Pounds to Ounces Reference Table
| Pounds (lb) | Ounces (oz) | Common context |
|---|---|---|
| 0.25 lb | 4 oz | Quarter pound |
| 0.5 lb | 8 oz | Half pound |
| 0.75 lb | 12 oz | - |
| 1 lb | 16 oz | Standard pound |
| 1.5 lb | 24 oz | - |
| 2 lb | 32 oz | - |
| 2.5 lb | 40 oz | - |
| 3 lb | 48 oz | - |
| 5 lb | 80 oz | Small bag of flour (US) |
| 10 lb | 160 oz | - |
| 25 lb | 400 oz | - |
When Do You Need to Convert lbs to oz?
- Cooking - US recipes that list both lb and oz fractions for ingredient amounts.
- Postal and shipping - parcel weight thresholds are often defined in oz (e.g., USPS First Class Mail under 13 oz).
- Food packaging - US net weight labeling uses oz; bulk purchasing uses lbs.
- Retail - pricing is often per oz; you have the quantity in lb.
Frequently Asked Questions
How many ounces is 1 pound?
Exactly 16 ounces. The avoirdupois pound has been defined as 16 ounces since at least the 14th century. 1 lb = 16 oz = 453.59237 g.
How do you convert lbs to oz?
Multiply by 16. For 3.5 lb: 3.5 × 16 = 56 oz. The result is exact - no rounding needed.
How many ounces is 5 pounds?
5 lb = 80 oz. Multiply 5 × 16 = 80. This is a common size for US bags of all-purpose flour.