Pound to Ounce Converter
Weight · unit-converter
Convert Pound to Ounce with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Pound (lb)
To: Ounce (oz)
About Pound
The international avoirdupois pound is exactly 0.45359237 kg. It is the standard pound for weight in the US and for many trade weights.
About Ounce
The avoirdupois ounce is 1/16 of an avoirdupois pound (about 28.35 g). Cooking and postal weights often use ounces.
How to convert pounds to ounces
1 pound is equal to 16 ounce:
1 lb = (453.59237 g ÷ 28.349523125 g) oz = 16 oz
1 pound = 16 ounces (avoirdupois) exactly.
Each pound is defined as 453.59237 g and each ounce as 28.349523125 g, so one lb equals 453.59237 ÷ 28.349523125 oz = 16 oz.
Let w(lb) be the numeric value of the same mass measured in Pound (lb), and w(oz) the value in Ounce (oz). Then:
w(oz) = w(lb) × (453.59237 / 28.349523125)
Equivalently, divide by how many lb fit into one oz (grams per oz divided by grams per lb):
w(oz) = w(lb) ÷ 0.0625
Or: ounce = pound ÷ 0.0625
Examples
Example #1: Convert 20 lb to ounce
20 lb = 20 lb × (453.59237/28.349523125) oz = 320 oz
20 lb = 20 lb ÷ 0.0625 = 320 oz
Example #2: Convert 50 lb to ounce
50 lb = 50 lb × (453.59237/28.349523125) oz = 800 oz
50 lb = 50 lb ÷ 0.0625 = 800 oz
Summary
To convert Pound to Ounce, multiply the value in lb by the ratio of grams per lb divided by grams per oz. Equivalently: value_oz = value_lb × (453.59237 / 28.349523125). Numerically, 1 lb equals 16 oz.
Relationship context
Both units belong to imperial / UK (stone, long ton, pound, ounce). Relationships such as 16 oz per lb and 14 lb per stone are exact in the avoirdupois system; tons use fixed pound counts. This tool uses international definitions tied to the kilogram.
Conversion tables
| Pound (lb) | Ounce (oz) |
|---|---|
| 0.1 | 1.6 |
| 1 | 16 |
| 2 | 32 |
| 3 | 48 |
| 4 | 64 |
| 5 | 80 |
| 6 | 96 |
| 7 | 112 |
| 8 | 128 |
| 9 | 144 |
| Pound (lb) | Ounce (oz) |
|---|---|
| 10 | 160 |
| 20 | 320 |
| 30 | 480 |
| 40 | 640 |
| 50 | 800 |
| 60 | 960 |
| 70 | 1,120 |
| 80 | 1,280 |
| 90 | 1,440 |
| 100 | 1,600 |