Ounces to Pounds Converter (oz to lb)

Ounces pile up quickly: a recipe that calls for three 14 oz cans, a shipment of small items or a bulk bag labeled only in ounces all become easier to judge in pounds. Since 16 oz make a pound, the job is a division by 16, and the answer can be written as a decimal (2.5 lb) or split into pounds and ounces (2 lb 8 oz).

Postage is a common reason to convert. USPS First-Class Mail caps letters at 3.5 oz and large envelopes at 13 oz, and heavier items have to go as packages instead. Unit prices are another: a price per ounce times 16 gives the price per pound.

How to use this tool

1. Type a value in the Ounce box to see it in pounds, or type in the Pound box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Weight & Mass converter.

Formula

Pound (lb) = Ounce (oz) × 0.0625

Ounce (oz) = Pound (lb) × 16

Both factors come from exact definitions: 1 pound = 16 ounces and 1 ounce = 0.0625 pounds (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

40 oz × 0.0625 = 2.5 lb

3.5 lb × 16 = 56 oz

Ounce to Pound chart

Common values from ounces to pounds, rounded to four decimal places.

Pound to Ounce chart

The reverse direction for values people often look up.

Limits and sizes set in ounces

Quick mental estimate

Halve four times to divide by 16: 40 oz → 20 → 10 → 5 → 2.5 lb. Each halving is exact, so this shortcut gives the true answer rather than an estimate.

Use the converter or the charts when the exact figure matters.

The two units

Ounce (oz): The avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 grams. It is the everyday ounce for food and parcels in the US; precious metals use the heavier troy ounce.

Pound (lb): The avoirdupois pound has been defined since 1959 as exactly 0.45359237 kilograms and is divided into 16 ounces. It is the everyday unit of weight in the US.