Convert Gram to Milligram
Use this free converter to change grams (g) into milligrams (mg). Gram and milligram both measure weight & mass. As a quick reference, 1 g equals 1000 mg, and 1 mg equals 0.001 g.
Free · runs in your browser · no sign-up
Milligram (mg)
1000
1 g = 1000 mg
Weight & Mass conversion table
| Gram | Milligram |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 1,000 | 1000000 |
How to convert Gram to Milligram
Multiply the gram value by 1000 to get milligrams.
- Enter the number of grams you want to convert.
- The converter instantly shows the equivalent value in milligrams.
- Worked example: 15 g × 1000 = 15000 mg.
- Use the swap button to reverse the conversion (milligram to gram).
About these units
Gram (g)
- Definition
- A gram (g) is one thousandth of a kilogram, a small metric unit of mass used for light objects.
- History
- Defined in the 1790s as the mass of one cubic centimeter of water at its freezing point.
- Current use
- Grams are used for food portions, nutrition labels, postage, and laboratory work worldwide.
Milligram (mg)
- Definition
- A milligram (mg) is one thousandth of a gram, used for very small masses such as medication doses.
- History
- It is a standard metric subdivision using the prefix "milli-" (one thousandth).
- Current use
- Milligrams express drug dosages, vitamin content, and quantities in chemistry and pharmacology.
Frequently asked questions
How many milligrams are in a gram?
There are 1000 mg in 1 g. To convert, multiply the number of grams by 1000.
How do I convert grams to milligrams?
Multiply the gram value by 1000 to get milligrams. For example, 10 g = 10000 mg.
Is this gram-to-milligram converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Gram to other weight & mass units
| Unit | 1 Gram equals |
|---|---|
| Kilogram (kg) | 0.001 kg |
| Milligram (mg) | 1000 mg |
| Microgram (µg) | 1000000 µg |
| Metric Ton (t) | 0.000001 t |
| Pound (lb) | 0.0022046226 lb |
| Ounce (oz) | 0.035273962 oz |
| Stone (st) | 0.00015747304 st |
| US Ton (ton) | 0.0000011023113 ton |
| Imperial Ton (long ton) | 9.8421e-7 long ton |
| Carat (ct) | 5 ct |