Convert

Gram to Milligram

Exact answer: 1 g = 1000 mg (exact – SI decimal prefix)

Gram and Milligram both belong to the Mass family. The difference is a decimal prefix, so the factor is a clean power of ten. Mass figures range from micrograms in analytics to tonnes in freight.

Unit console

Convert units with formula, context and precision

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

What do you want to convert?

From0.1 g

Result100 mg

Factor1 g = 1000 mg

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

010.1 g = 100 mg

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Pound is not always the same local unit. UnitCloud uses international avoirdupois values.

03Base unit: g

1 g = 1000 mg. Gram is the base unit of the family, so the value is converted directly.

Table

Gram to Milligram
Gram	Milligram
0.1	100
0.5	500
1	1,000
2.5	2,500
5	5,000
10	10,000

Formula

1 g = 1000 mg. Gram is the base unit of the family, so the value is converted directly.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Ounce to Gramoz → gMass Gram to Ounceg → ozMass Gram to Kilogramg → kgMass Kilogram to Gramkg → gMass

Search and practice paths

FormulaTableExamplesCommon mistakeEveryday/engineeringExcel/CSVBatch converterPrint view

Data rateReading internet speed correctly

Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Mass. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Gram to Milligram?

1 g = 1000 mg

Which formula does Gram to Milligram use?

1 g = 1000 mg. Gram is the base unit of the family, so the value is converted directly.

What is the most common mistake?

Pound is not always the same local unit. UnitCloud uses international avoirdupois values.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.