Grams to Milligrams Converter
1 gram = 1,000 milligrams
1 gram equals 1,000 milligrams
How to convert grams to milligrams
These units measure mass. Pounds and ounces mean avoirdupois unless the unit explicitly says troy; a fluid ounce measures volume and requires a density to relate it to mass.
mg = g × 2000/2One gram is 2000/2 milligrams, so a single multiplication converts any value.
10,000 mg = 10 × 2000/2Grams to milligrams conversion table
Common values in grams, converted to milligrams.
| Grams (g) | Milligrams (mg) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
About these units
gramg
One thousandth of a kilogram. The everyday metric unit for small masses.
milligrammg
One thousandth of a gram, the standard unit for medication doses.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.