How to convert grams to milligrams
To convert grams to milligrams, multiply by 1,000. Weight and mass conversions matter for cooking, shipping, fitness tracking, medicine and trade.
Gram to Milligram 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 |
| 3 g | 3,000 mg |
| 4 g | 4,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
About the units
Gram (g)
A gram is one thousandth of a kilogram and the everyday metric unit for food and small items.
Milligram (mg)
A milligram is one thousandth of a gram, typically used for medication doses and nutrition labels.
How to use this converter
- Type the number of grams (g) in the input box.
- The result in milligrams appears instantly — no button needed.
- See the same value in every other weight unit just below.
- Use “Swap units” to convert milligrams back to grams.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many milligrams are in one gram?
One gram equals 1,000 milligrams. 1,000 is the exact factor used by this converter.
How do I convert grams to milligrams?
Multiply the value in grams by 1,000. To go the other way, multiply milligrams by 0.001.
What is 10 g in mg?
10 g = 10,000 mg. Also, 5 g = 5,000 mg and 100 g = 100,000 mg.
What is the difference between a gram and a milligram?
A gram is one thousandth of a kilogram and the everyday metric unit for food and small items. A milligram is one thousandth of a gram, typically used for medication doses and nutrition labels.
Is this tool free and private?
Yes — the Gram to Milligram is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
Related tools
📬 Get new tools first — free
Join Taurang to hear about new calculators, converters and features. No spam; unsubscribe anytime.