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.
When you’ll use the gram to milligram conversion
Converting grams to milligrams comes up more often than you might expect — for example when shipping a parcel priced per kilogram, tracking body weight in a different unit, or following a recipe written in grams. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 g = 1,000 mg.
Watch out for these mix-ups
- Mixing the avoirdupois ounce with the fluid ounce (volume).
- Confusing the metric ton (1,000 kg) with the US short ton (907 kg).
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.
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