Convert Kilograms to Grams - Weight Converter
This converter converts a mass value expressed in kilograms (kg) to grams (g) using the International System of Units (SI) relationship: 1 kilogram equals 1000 grams. Use this for quick unit changes, recipe scaling, laboratory notes, shipping calculations, and educational purposes.
The tool returns the mathematical conversion only. When the value originates from a physical measurement, consider instrument accuracy, calibration, and environmental factors that affect the measured mass. See methodology and FAQs for guidance on precision, calibration, and applicable standards.
Governance
Record 9e118710fea1 • Reviewed by Fidamen Standards Committee
Interactive Converter
Convert between kilogram and gram with precision rounding.
Quick reference table
| Kilogram | Gram |
|---|---|
| 1 kg | 1,000 g |
| 5 kg | 5,000 g |
| 10 kg | 10,000 g |
| 25 kg | 25,000 g |
| 50 kg | 50,000 g |
| 100 kg | 100,000 g |
Methodology
The conversion relies on the fixed metric relation defined by the SI system: 1 kg = 1000 g. This is an exact defined ratio and does not vary with context.
When converting measured masses rather than nominal values, follow metrology best practices. Use calibrated instruments traceable to national standards, document measurement uncertainty, and apply appropriate rounding rules consistent with the intended use and regulatory requirements.
Relevant standards and authorities include the International Bureau of Weights and Measures (BIPM) for SI definitions, the National Institute of Standards and Technology (NIST) for U.S. measurement traceability and guidance, and ISO standards for laboratory and quality management where applicable.
Worked examples
1 kilogram = 1000 grams
0.5 kilogram = 500 grams
2.35 kilograms = 2350 grams
0.001 kilogram = 1 gram
F.A.Q.
Is the conversion factor exact?
Yes. The metric relationship used here is exact: 1 kilogram equals 1000 grams. The arithmetic conversion is therefore exact; any uncertainty arises from source measurements or rounding choices, not the conversion factor.
How should I round converted values?
Round based on the precision of the original measurement or the needs of your application. For laboratory or regulated work, follow documented rounding rules in your quality system or relevant standards. When unsure, preserve at least the same number of significant digits as the input measurement.
Does this converter account for weighing instrument error?
No. This converter performs a mathematical unit conversion only. If your input is from a balance or scale, account separately for instrument calibration, linearity, drift, and measurement uncertainty before reporting final values.
When do I need traceable calibration?
Traceable calibration is required when measurements are used for regulatory compliance, legal-for-trade transactions, clinical dosing, or any context where documented accuracy is mandatory. Follow national metrology institute guidance and ISO standards for calibration intervals and procedures.
Is mass the same as weight?
Not strictly. Mass is an intrinsic property measured in kilograms or grams. Weight is the force due to gravity on a mass and is measured in newtons. In everyday contexts on Earth, people often use 'weight' to mean mass; ensure correct terminology for technical or legal purposes.
Sources & citations
- BIPM — The International System of Units (SI) — https://www.bipm.org/en/measurement-units
- NIST — Weights and Measures and Metrology resources — https://www.nist.gov/pml/weights-and-measures
- ISO — Standards catalogue (search for measurement, calibration, and laboratory standards) — https://www.iso.org/standards.html
- OSHA — General safety and measurement considerations in workplaces — https://www.osha.gov
- ISO 80000-4:2019 — Mechanics — https://www.iso.org/standard/64975.html
- BIPM SI Brochure (9th edition, 2019) — https://www.bipm.org/en/publications/si-brochure
- NIST SP 811 — Guide for the Use of the International System of Units — https://www.nist.gov/pml/special-publication-811
Further resources
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: 9e118710fea1What 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
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
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
UI
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: 2edcaf170ba4