Milligrams to Grams
Convert milligrams (mg) to grams (g). 1 mg = 0.001 g (and 1 g = 1000 mg). It all runs locally in your browser.
Milligrams to Grams table
| Milligrams | Grams |
|---|---|
| 0.5 mg | 0.0005 g |
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 3 mg | 0.003 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 g |
| 25 mg | 0.025 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
Where this conversion shows up
Medicine, supplements and nutrition, where doses are printed in milligrams but totals get discussed in grams — and where a factor-of-1000 slip is the classic dangerous error.
Worked example
A strong coffee has about 95 mg of caffeine, so the widely cited 400 mg daily ceiling is 0.4 g, or roughly four cups. A 500 mg paracetamol tablet is half a gram.
Rounding and precision
No rounding needed — it is a straight shift of the decimal point three places. The risk here is not precision, it is misreading mg for g on a label or a prescription.
How to convert
To convert milligrams to grams, multiply by 0.001. Need other units? Use the full Unit Converter.
FAQ
How many grams in a milligram?
1 milligram equals 0.001 grams (g).
How do I convert milligrams to grams?
Multiply the milligrams value by 0.001. For example, 5 mg = 0.005 g.
How many mg in a gram?
1,000 mg. To convert milligrams to grams, divide by 1,000; to go the other way, multiply by 1,000.
Is 500mg the same as 0.5g?
Yes, exactly. They are two ways of writing the same quantity — which is why labels sometimes use one and packaging the other.