Convert Gram to Milligram
Turn Grams into Milligrams in an instant. Type a value below to get an accurate g → mg result, with the formula and a quick-reference table.
1 g = 1,000 mg
Quick answer: 1 Gram = 1,000 Milligram
Gram to Milligram conversion table
| Gram (g) | Milligram (mg) |
|---|---|
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 20 g | 20,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
How to convert Gram to Milligram
To convert Grams to Milligrams, multiply the value by 1,000.
- Take your measurement in Grams.
- Multiply it by 1,000 — the number of Milligrams in one Gram.
- The result is the same amount, expressed in Milligrams.
To go the other way, multiply Milligrams by 0.001 — or simply divide by 1,000.
For example, a medium apple is about 100 g, which is 100,000 mg.
About Gram and Milligram
A gram is the everyday metric unit of mass, one-thousandth of a kilogram. It is used for food portions, cooking ingredients and postage.
A milligram is one-thousandth of a gram (1/1000 g), a unit for very small masses. It is used for medicine doses, vitamins and nutritional amounts.
Both the Gram and the Milligram are metric units, so converting between them is just a change of scale: one Gram equals 1,000 Milligrams, and the Gram is the larger unit.
Other weight & mass conversions
Frequently asked questions
How many Milligrams are in a Gram?
1 Gram equals 1,000 Milligram (g → mg). To convert any amount, multiply the number of Grams by 1,000.
How do I convert Gram to Milligram?
Enter the number of Grams in the converter above and read the result in Milligrams. It applies the exact g → mg factor instantly, with full precision.
Is the Gram to Milligram converter free?
Yes — it is completely free and unlimited, needs no sign-up, and runs right in your browser, so it is instant and private.
Is the conversion accurate?
Yes. It uses the internationally defined weight & mass factors and full floating-point precision, then rounds the display to a clean, readable number.