⚖️ Weight & Mass
g to mg Converter
Convert g to mg instantly with a reference conversion table.
Quick answer: To convert g to mg, multiply by 1000. For example, 1 g = 1000 mg. Use the calculator below for any value.
g to mg
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Common conversions
| g | mg |
|---|
Formula:
How to convert g to mg
1
Enter your value
Type the number of g you want to convert into the left box. The result in mg appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — mg to g. Your current value carries across so you don't have to re-enter anything.
3
About g and mg
g and mg are common weight measurements.
📊 Common conversions at a glance
| g | mg |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1000 |
Reviewed for 2026. g ↔ mg conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert g to mg?
To convert g to mg, multiply by 1000. Or use the calculator above for instant results.
How many mg are in 1 g?
1 g equals 1000 mg.
Is the g to mg converter free?
Yes, the g to mg converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.