Grams to mg – convert grams to milligrams
Convert grams to milligrams (g to mg) for medication doses, chemistry, supplements and precise recipe ingredients. This page opens the main mass converter with g → mg pre-selected.
Open the interactive grams → mg converter:
Use main converter (g → mg) or switch to mg → gThe homepage also converts between kilograms, grams, milligrams, tonnes, pounds, ounces and stone.
Quick reference: grams to milligrams
One gram is exactly 1,000 milligrams, so: mg = g × 1,000. Examples:
| Mass (g) | Mass (mg) |
|---|---|
| 0.1 g | 100 mg |
| 0.25 g | 250 mg |
| 0.5 g | 500 mg |
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
Why convert grams to milligrams?
g to mg is useful when you:
- Read medicine labels and convert gram amounts into precise mg doses.
- Measure small quantities in chemistry or lab experiments.
- Track supplements or nutrients that are listed in milligrams.
- Convert tiny recipe amounts (like spices) from grams to mg for accuracy.
Other mass converters on this site
All mass conversions on this site follow SI definitions, so you can safely use them for science, cooking and everyday calculations.
Page last updated: 11 December 2025.