Convert Grams to Micrograms - Weight Converter

This tool converts mass values from grams (g) to micrograms (µg) using the International System of Units (SI) scaling. The conversion is exact in mathematical terms: 1 gram equals 1,000,000 micrograms (1 g = 1×10^6 µg).

Use this converter for laboratory calculations, dosing, trace analysis, and documentation. For regulated workflows, ensure measurement instruments are calibrated and results reported with appropriate uncertainty and significant figures.

Updated Nov 14, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 68595e4d3a19 • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between gram and microgram with precision rounding.

Gram (g)Microgram (mcg)

Quick reference table

Gram	Microgram
1 g	MCG 1,000,000.00 mcg
5 g	MCG 5,000,000.00 mcg
10 g	MCG 10,000,000.00 mcg
25 g	MCG 25,000,000.00 mcg
50 g	MCG 50,000,000.00 mcg
100 g	MCG 100,000,000.00 mcg

Methodology

SI prefixes are base-10 multipliers; the prefix "micro" denotes 10^-6. Converting between metric units of mass is a scale multiplication or division by a power of ten.

Practical accuracy depends on the measuring device and procedure. Follow traceability and calibration practices referenced by NIST and ISO when converting values that feed regulatory reports or safety limits.

When reporting results, include appropriate significant figures and, where applicable, an uncertainty estimate from instrument calibration or validation data.

Key takeaways

Conversion is a direct scaling by 10^6 (multiply grams by 1,000,000).

Observational precision, instrument calibration, and reporting conventions determine how to round or report converted values in professional settings.

Worked examples

1 gram → 1 × 10^6 µg = 1,000,000 µg

0.0025 g → 0.0025 × 1,000,000 = 2,500 µg

0.000123 g → 0.000123 × 1,000,000 = 123 µg

F.A.Q.

What is the exact conversion factor between grams and micrograms?

Exactly 1 gram = 1,000,000 micrograms (1 g = 1×10^6 µg). The microgram symbol is µg.

Can I convert weight measured on a scale directly to micrograms?

Scales measure mass; conversion between grams and micrograms is mathematical and valid for mass. If you are measuring weight under varying gravity (e.g., different planets) be careful: regulatory and scientific contexts generally assume mass in SI units.

How many significant figures should I keep after converting?

Keep as many significant figures as are supported by the original measurement and instrument uncertainty. Consult your lab's uncertainty budget or calibration certificate; follow NIST guidance for reporting significant figures and uncertainties.

Are there regulatory limits expressed in micrograms?

Yes. Some exposure limits and environmental concentrations use micrograms per cubic meter (µg/m³) or micrograms per liter (µg/L). When converting for compliance, use the exact conversion factor but ensure sampling, detection limits, and uncertainty meet regulatory requirements referenced by agencies such as OSHA.

Does the converter account for measurement uncertainty or calibration?

No. This converter performs a mathematical scale conversion only. For certified results, combine the numeric conversion with instrument uncertainty, calibration status, and traceability to standards (for example, NIST-traceable calibrations).

Sources & citations

NIST - SI Units and Metric Policy — https://www.nist.gov/pml/weights-and-measures/si-units
BIPM - The International System of Units (SI Brochure) — https://www.bipm.org/en/publications/si-brochure
ISO - International Organization for Standardization — https://www.iso.org
IEEE Standards Association — https://standards.ieee.org
OSHA - Occupational Safety and Health Administration — https://www.osha.gov
ISO 80000-4:2019 — Mechanics — https://www.iso.org/standard/64975.html
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: 68595e4d3a19

What changed (latest)

v1.0.0 • 2025-11-14 • 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 14, 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 • 2025-11-14 • 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: 0a05e8fa4d2b