Fidamen

Convert Grams to Ounces – Weight Converter

This converter converts mass values from grams to ounces using the international avoirdupois definition. It is intended for general-purpose use in cooking, laboratory notes, shipping estimations, and quick unit checks.

Results are given using the internationally agreed fixed relationship between the avoirdupois ounce and the gram. For high-precision or legally regulated weighing, follow calibration and compliance guidance in the methodology and citations below.

Updated Nov 8, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 186e749aec20 • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between gram and ounce with precision rounding.

Quick reference table

GramOunce
1 g0.0353 oz
5 g0.1764 oz
10 g0.3527 oz
25 g0.8818 oz
50 g1.7637 oz
100 g3.5274 oz

Methodology

The avoirdupois ounce is defined by international agreement as exactly 1/16 of an avoirdupois pound, where 1 avoirdupois pound is exactly 0.45359237 kilograms. That yields an exact relation of 1 avoirdupois ounce = 28.349523125 grams.

This tool applies that fixed mathematical relationship for conversion. It does not perform adjustments for local measurement laws, humidity, scale tare, or bulk density effects.

For regulated measurements, verification and calibration should follow NIST publications and relevant ISO standards such as ISO/IEC 17025 for laboratory calibration and ISO 80000 for quantities and units. Follow workplace measurement and safety rules from applicable OSHA guidance when weighing in occupational settings.

Key takeaways

Use this converter for fast, deterministic conversions between grams and avoirdupois ounces based on the exact international definition.

For legal, commercial, or laboratory-critical measurements, always rely on calibrated instruments, documented procedures, and the relevant standards cited below.

Worked examples

100 grams ÷ 28.349523125 = 3.5273961947 → commonly reported as 3.5274 ounces.

50 grams ÷ 28.349523125 = 1.7636980974 → commonly reported as 1.7637 ounces.

0.5 ounce × 28.349523125 = 14.1747615625 grams → reported as 14.1748 grams when needed.

F.A.Q.

Is this conversion suitable for precious metals such as gold?

No. Precious metals commonly use the troy ounce, which is different: 1 troy ounce = 31.1034768 grams. This converter uses the avoirdupois ounce (1 oz = 28.349523125 g). Use a troy-ounce-specific converter for bullion and precious-metal work.

How many decimal places should I trust in the result?

Trust digits within the measurement device resolution and calibration uncertainty. For kitchen use, 2–4 significant digits are normally sufficient. For laboratory or trade measurements, report according to the instrument's calibrated uncertainty and the requirements of ISO/IEC 17025 or local regulations.

Does this converter account for scale tare, buoyancy, or environmental effects?

No. This is a pure mathematical unit conversion. Buoyancy corrections, tare adjustments, and environmental effects must be applied separately according to the weighing procedure and standards.

Where does the conversion factor come from?

The conversion factor arises from the international definition of the avoirdupois pound and international SI definitions. The resulting exact value used here is 28.349523125 grams per avoirdupois ounce.

What standards should I consult for calibration and legal measurements?

Consult NIST publications for weights and measures, the BIPM SI brochure for unit definitions, ISO/IEC 17025 for calibration laboratory competence, and any local legal metrology regulations. OSHA provides workplace safety requirements that may apply during weighing operations.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: 186e749aec20

What changed (latest)

v1.0.0 • 2025-11-08 • 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

UI

v1.0.0

Governance

Last updated: Nov 8, 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 • 2025-11-08 • 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: ebaabb6eaac6