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Gram to Milligram
Convert gram (g) to milligram (mg) — with the exact factor, a quick-reference table and a free converter that works offline.
1 g = 1,000 mg
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Open the free converter with this conversion pre-loaded — no sign-up, works offline after first load.
Conversion table
| Gram (g) | Milligram (mg) |
|---|---|
| 0.1 g | 100 mg |
| 0.5 g | 500 mg |
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 25 g | 25,000 mg |
| 100 g | 100,000 mg |
How the conversion works
Both units measure mass. One gram equals exactly 1,000 mg, so multiply by that factor to convert.
FAQ
How many milligrams in a gram?
1 g = 1,000 mg.
How do I convert gram to milligram?
Multiply the gram value by 1,000. For example, 10 g × 1,000 = 10,000 mg.
Where does the factor come from?
The conversion factor is defined in BIPM SI Brochure; both units are mass units converted through kilogram.
Related conversions
Conversion factors: BIPM SI Brochure. Computed by the same engine that powers the app.
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