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Convert milligrams to grams
Instant, accurate mg → g conversion with a live converter, table and formula.
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1 milligram = 0.001 grams
1 gram = 1000 milligrams
milligrams to grams table
| milligrams (mg) | grams (g) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
Formula
grams = milligrams × 0.001.
Example
10 milligrams = 0.01 grams.
What is a milligram?
A milligram (mg) is one-thousandth of a gram, used for medicine doses and nutrients.
What is a gram?
A gram (g) is one-thousandth of a kilogram; a paperclip weighs about 1 g.
Real-world reference points
A kilogram is a liter of water; a pound is a loaf of bread; an ounce is a slice of it.
| Reference | milligrams | grams |
|---|---|---|
| Smartphone | 180,000 mg | 180 g |
| Liter of water | 1,000,000 mg | 1,000 g |
| Newborn baby (average) | 3,300,000 mg | 3,300 g |
| Airline checked-bag limit (common) | 23,000,000 mg | 23,000 g |
| Cement bag (standard) | 50,000,000 mg | 50,000 g |
Mistakes to avoid with mass conversions
- Confusing weight ounces with fluid ounces — one measures mass, the other volume.
- Reading 'stone and pounds' (11 st 6 lb) as decimal stone (11.6 st) — they differ.
- Comparing net vs gross weight when shipping: the box and padding count toward limits.
Frequently asked questions
How many grams in a milligrams?+
1 milligram = 0.001 grams.
How do I convert milligrams to grams?+
Enter the value in the milligrams box above and the grams value appears instantly. You can also type in the grams box to convert the other way.
Is this mg to g converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.