Density and Mass
gtomg
Convert grams (g) to milligrams (mg).
Factor1 g = 1000 mg
Converter
g
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mg
Rendered to 6 significant figures.
Formula
Formula
mg = g × 1000
Multiply any value in grams by 1000 to obtain the value in milligrams.
Worked example
Convert 1 g to mg.
- 01Start with 1 g.
- 02Multiply by the conversion factor: 1 × 1000 = 1000 mg.
Result1 g = 1000 mg
Conversion table
| g | mg |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from g to mg?
1 g equals 1000 mg. To convert, multiply the value in grams by 1000.
How do I convert 1 g to mg?
1 g = 1000 mg. For any value, multiply by 1000.
How do I convert mg back to g?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 mg = 0.001 g.
When would I need to convert gram to milligram?
Mass conversions appear in material balances, reagent dosing, and reconciling vendor specifications across imperial/metric systems.
Is the conversion exact?
Yes. Both g and mg are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).