Mg to grams
One mg equals 0.001 g. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
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Common values
| mg | grams |
|---|---|
| 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 |
| 15 mg | 0.015 g |
| 20 mg | 0.02 g |
| 25 mg | 0.025 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
| 500 mg | 0.5 g |
| 1000 mg | 1 g |
How to use
- Enter the number of mg in the field.
- The result in grams updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: g = mg ÷ 1000. Going back the other way, one g is 1000 mg.
Metric units differ by powers of ten
Both units belong to the metric system, so the conversion is a shift of the decimal point: the factor is a power of ten and nothing is lost to rounding.
g = mg ÷ 1000
Frequently asked questions
How many grams are in one mg?
One mg is 0.001 g.
How do I convert mg to grams?
Multiply by the factor: g = mg ÷ 1000.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert grams back to mg?
One g is 1000 mg — or open the reverse page linked below.