Convert Grams to Milligrams
One gram equals 1,000 milligrams. Type any value to convert grams to milligrams instantly — with a full reference table below.
Convert Grams to Milligrams
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How to convert Grams to Milligrams
To convert grams to milligrams, multiply by 1,000. One gram equals 1,000 mg, and one milligram equals 0.001 g.
- Take the value in grams — for example 7.5 g.
- Multiply by 1,000 (the number of milligrams in one gram).
- 7.5 × 1,000 = 7,500 mg.
Shortcut: the factor is a power of ten, so just move the decimal point 3 places to the right.
Grams to Milligrams conversion table
| Grams | Milligrams |
|---|---|
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 4 g | 4,000 mg |
| 5 g | 5,000 mg |
| 6 g | 6,000 mg |
| 7 g | 7,000 mg |
| 8 g | 8,000 mg |
| 9 g | 9,000 mg |
| 10 g | 10,000 mg |
| 12 g | 12,000 mg |
| 15 g | 15,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| Milligrams | Grams |
|---|---|
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 3 mg | 0.003 g |
| 4 mg | 0.004 g |
| 5 mg | 0.005 g |
| 6 mg | 0.006 g |
| 7 mg | 0.007 g |
| 8 mg | 0.008 g |
| 9 mg | 0.009 g |
| 10 mg | 0.01 g |
| 12 mg | 0.012 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 |
About converting Grams to Milligrams
Grams (g) and Milligrams (mg) are both units of weight. The exact factor is 1 g = 1,000 mg, so multiply by 1,000 to go from grams to milligrams (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Milligrams to Grams converter, or the full unit converter for every unit at once.
Real-world weight in grams and milligrams
| Example | Grams | Milligrams |
|---|---|---|
| A US nickel coin | 5 g | 5,000 mg |
| 1 litre of water | ≈ 1,000 g | ≈ 1,000,000 mg |
| An Olympic men's barbell | 20,000 g | 20,000,000 mg |
| A typical checked-bag limit (economy) | ≈ 23,000 g | ≈ 23,000,000 mg |
“≈” marks typical values; the rest are defined or measured figures.
The units
One thousandth of a kilogram.
Used for: Cooking, postage and food packaging.
One thousandth of a gram.
Used for: Medicine doses and nutrition labels.
These factors are exact: since 1959 the avoirdupois pound is defined as exactly 0.45359237 kg, and the ounce as 1/16 of that.