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.

Updated Nov 15, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record cf666ecd42ab • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between ounce and pound with precision rounding.

Ounce (oz)Pound (lb)

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

F.A.Q.

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
NIST SP 811 — Guide for the Use of the International System of Units — https://www.nist.gov/pml/special-publication-811

Further resources

Related tools

External guidance

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: cf666ecd42ab

What changed (latest)

v1.0.0 • 2025-11-15 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

Governance

Last updated: Nov 15, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
MINOR: New features or fields that do not change existing outputs for the same inputs.
PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

Verify formulas and unit definitions against primary standards or datasets.
Run golden-case regression suite and edge-case suite.
Record reviewer sign-off with credentials and scope.
Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

Uses exact unit definitions from the Fidamen conversion library.
Internal calculations use double precision; display rounding follows the unit's configured decimal places.
Not a substitute for calibrated instruments in regulated contexts.
Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-15 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: c70b39279cdb