Convert Ounces to Pounds – Weight Converter
This tool converts a single value in ounces (oz) to pounds (lb) using the fixed mathematical relationship used in everyday and commercial weighing: 16 ounces equals 1 pound. Use the converter for quick unit conversions for recipes, shipping, inventory, and light engineering checks.
Results are presented as a numeric conversion only. For regulated trade, laboratory, or safety use, verify measurements against a calibrated scale and follow applicable measurement and occupational safety standards listed in the citations.
Interactive Converter
Convert between ounce and pound with precision rounding.
Quick reference table
| Ounce | Pound |
|---|---|
| 1 oz | 0.0625 lb |
| 5 oz | 0.3125 lb |
| 10 oz | 0.625 lb |
| 25 oz | 1.5625 lb |
| 50 oz | 3.125 lb |
| 100 oz | 6.25 lb |
Methodology
The converter applies the exact avoirdupois relationship used in common measurement systems: 1 pound = 16 avoirdupois ounces. This is a fixed, exact ratio for unit conversion and does not depend on material density or context.
Display rounding is determined by the user interface. For critical uses, keep additional significant digits and consult measurement device specifications and standards for allowable tolerance and calibration procedures.
For traceable and legally required measurements, follow calibration and uncertainty procedures in NIST Handbook 44 and applicable ISO standards listed in the citations. For numerical computing, be aware of floating-point rounding behavior described by IEEE standards.
Worked examples
32 ounces → 32 ÷ 16 = 2 pounds
5 ounces → 5 ÷ 16 = 0.3125 pounds (0.3125 lb)
1.5 pounds → 1.5 × 16 = 24 ounces
Further resources
Expert Q&A
Is the conversion exact?
Yes. The avoirdupois system defines 1 pound as exactly 16 avoirdupois ounces. The mathematical conversion between these units is an exact fixed ratio.
Why do I sometimes see slightly different results on calculators?
Differences come from rounding and display precision in software or hardware, and from floating-point arithmetic rounding discussed in IEEE standards. For best results in critical work, increase display precision and check device specifications.
How do I convert ounces to pounds and remaining ounces?
Divide total ounces by 16. The integer part is the number of whole pounds. Multiply the fractional part by 16 to get the remaining ounces.
Are there other definitions of ounce?
Yes. This converter uses the avoirdupois ounce common in the United States and UK for everyday mass. There are other historical ounces and troy ounces used for precious metals. Use the appropriate converter for troy ounces.
What accuracy and calibration guidance should I follow?
For trade, legal, laboratory, or safety-critical work, use calibrated instruments and follow procedures from NIST Handbook 44 and relevant ISO calibration standards. Document uncertainties and follow workplace safety guidance from OSHA where handling loads is involved.
Sources & citations
- NIST Handbook 44 — Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices — https://www.nist.gov/pml/weights-and-measures/handbook-44
- NIST Guide to the International System of Units (SI) — https://www.nist.gov/pml/weights-and-measures/metric-si
- ISO 80000 Quantities and Units (overview) — https://www.iso.org/standard/30669.html
- IEEE Standard for Floating-Point Arithmetic (IEEE 754) — https://standards.ieee.org/standard/754-2019.html
- Occupational Safety and Health Administration (OSHA) — Safety and health regulations — https://www.osha.gov