# Pounds to ounces converter

> Convert pounds to ounces (lbs to oz) with the exact factor, a conversion chart and worked steps.

Interactive version: https://www.calcopenly.com/conversion/pounds-to-ounces
Subject: Unit converters

Pounds are often used on parcel labels and equipment specifications. This is avoirdupois mass, rather than a force rating. If the source gives pounds plus ounces, combine them correctly before conversion. A carrier's billed weight can also depend on package dimensions.

One pound is exactly 16 ounces, so 1 lb is 16 oz. To convert lbs to oz, multiply by 16; to convert back, multiply by 0.0625.

The international avoirdupois pound is defined as exactly 0.45359237 kg (1959 agreement). Because both units are defined exactly, the factor above is exact and the results here carry no conversion error.

## Inputs

- **Pounds (lb)**

## Results

- Ounces (oz) — main result
- Conversion
- 1 oz in pounds (lb)

## Formula

$$
\text{ounces} = \text{pounds} \times 16
$$

## Worked examples

### 1 lb to oz

- Pounds (lb): 1 lb
- **Ounces: 16 oz**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 5 lb to oz

- Pounds (lb): 5 lb
- **Ounces: 80 oz**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 0.25 lb to oz

- Pounds (lb): 0.25 lb
- **Ounces: 4 oz**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert lbs to oz?

Pounds are often used on parcel labels and equipment specifications. This is avoirdupois mass, rather than a force rating. If the source gives pounds plus ounces, combine them correctly before conversion. A carrier's billed weight can also depend on package dimensions.

### How many ounces are in a pound?

One pound is exactly 16 ounces. The international avoirdupois pound is defined as exactly 0.45359237 kg (1959 agreement).

### How do you convert lbs to oz?

Multiply the number of pounds by 16. For example, 1 lb × 16 = 16 oz. To go the other way, divide by 16.

### How accurate is the pounds to ounces converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “1 lb to oz” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

### Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

## Sources

- [NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C: General tables of units of measurement](https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-44)
- [BIPM, The International System of Units (SI Brochure), 9th edition](https://www.bipm.org/en/publications/si-brochure)