Pounds to Ounces Converter
Enter a weight in pounds and get the exact equivalent in ounces, grams, and kilograms. The converter uses the international avoirdupois standard: exactly 16 ounces per pound. Switch the mode selector to convert from ounces back to pounds, or from grams and kilograms. A worked example and common-weight reference table are included below.
Formula
Worked example
5 pounds to ounces: 5 × 16 = 80 oz. To grams: 5 × 453.59237 = 2267.962 g. In mixed units: 5 lb 0.000 oz.
How to convert pounds to ounces
The avoirdupois pound and ounce are the weight units used for everyday goods in the United States, the United Kingdom, and other countries that historically used British Imperial measures. The relationship is exact: 1 pound equals 16 ounces. To convert any weight in pounds to ounces, multiply by 16. To convert back, divide by 16. For example, 5 pounds equals 5 times 16, which is 80 ounces. A half-pound is 8 ounces, a quarter-pound is 4 ounces, and a tenth of a pound is 1.6 ounces.
Pounds, ounces, and the metric system
One pound is defined as exactly 0.45359237 kilograms, a definition that has been internationally agreed since 1959. This means one ounce equals 0.45359237 kg divided by 16, which is approximately 28.349523 grams. These exact definitions mean conversions between the avoirdupois and metric systems never involve rounding in the definition itself, only in how many decimal places you choose to display. The converter on this page uses the full precision of the international definition throughout.
Mixed pounds and ounces display
Weights are often expressed as a combination of whole pounds and remaining ounces, for example on food packaging, infant birth weights, and deli counters. The "Pounds and ounces" output on this calculator automatically splits your result into the whole-pound component and the leftover ounces, so you can read it either way. For instance, 1.5 pounds is 24 ounces, displayed as 1 lb 8.000 oz in mixed format.
When this conversion comes up in practice
Pounds-to-ounces conversions appear in cooking and baking (recipes that list some ingredients in ounces and others in pounds), postal and courier shipping (carriers often switch units depending on package weight), medical settings (birth weights, medication doses per pound of body weight), and product labeling. The reference table below covers the most common weights you are likely to encounter.
Common weight conversions: pounds to ounces
| Pounds (lb) | Ounces (oz) | Grams (g) | Kilograms (kg) |
|---|---|---|---|
| 0.25 | 4 | 113.398 | 0.1134 |
| 0.5 | 8 | 226.796 | 0.2268 |
| 1 | 16 | 453.592 | 0.4536 |
| 2 | 32 | 907.185 | 0.9072 |
| 3 | 48 | 1360.777 | 1.3608 |
| 4 | 64 | 1814.369 | 1.8144 |
| 5 | 80 | 2267.962 | 2.268 |
| 10 | 160 | 4535.924 | 4.5359 |
| 20 | 320 | 9071.847 | 9.0718 |
| 50 | 800 | 22679.619 | 22.6796 |
| 100 | 1600 | 45359.237 | 45.3592 |
Exact avoirdupois conversions. 1 lb = 16 oz = 453.59237 g.
Frequently asked questions
How many ounces are in a pound?
There are exactly 16 avoirdupois ounces in one pound. This is the standard used in the United States and the United Kingdom for everyday goods. Note that a troy ounce, used for precious metals, is heavier than an avoirdupois ounce: 1 troy pound equals only 12 troy ounces, and the troy system is separate from the avoirdupois system this calculator uses.
How do I convert pounds to ounces?
Multiply the number of pounds by 16. For example, 3.5 pounds times 16 equals 56 ounces. To go the other direction, divide ounces by 16: 56 ounces divided by 16 is 3.5 pounds. The "Convert from" selector above lets you start from whichever unit you already have.
How do I convert ounces to pounds?
Divide the number of ounces by 16. For example, 100 ounces divided by 16 equals 6.25 pounds, or 6 pounds and 4 ounces. You can also use the reverse-mode feature by changing "Convert from" to Ounces.
What is the difference between avoirdupois ounces and troy ounces?
An avoirdupois ounce (the kind used in this calculator) equals approximately 28.35 grams. A troy ounce, used for gold, silver, and other precious metals, equals 31.1035 grams. If you are converting a precious-metal weight, you need a troy-unit converter instead.
How many ounces are in a half-pound?
A half-pound (0.5 lb) equals exactly 8 ounces. A quarter-pound equals 4 ounces. You will see these on food labels, deli counters, and in recipes regularly.
How do I convert grams to pounds and ounces?
Divide grams by 453.59237 to get pounds, then separate the whole number (pounds) from the decimal fraction and multiply that fraction by 16 to get remaining ounces. For instance, 500 g divided by 453.59237 is about 1.1023 lb, so 1 whole pound and 0.1023 times 16, which is about 1.636 oz, giving 1 lb 1.636 oz. The calculator does this automatically when you select Grams in the mode selector.