1 mg = 0.001 g (milligram → gram)
1 mg = 0.001 g
1 milligram equals 0.001 grams. To convert milligrams to grams, multiply the milligram value by 0.001. For quick reference: 1 mg = 0.001 g, 5 mg = 0.005 g, 10 mg = 0.01 g, 100 mg = 0.1 g.
Start with your value in milligrams.
Multiply the milligram value by 0.001. This is the exact conversion factor from milligrams to grams.
The product is your value in grams. For example, 5 mg × 0.001 = 0.005 g.
The exact factor from milligrams to grams is 0.001.
Grams = Milligrams × 0.001
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Milligrams (mg) | Grams (g) |
|---|---|
| 0.1 mg | 1.0000 × 10^−4 g |
| 0.25 mg | 0.00025 g |
| 0.5 mg | 0.0005 g |
| 1 mg | 0.001 g |
| 1.5 mg | 0.0015 g |
| 2 mg | 0.002 g |
| 2.5 mg | 0.0025 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 |
| 18 mg | 0.018 g |
| 20 mg | 0.02 g |
| 25 mg | 0.025 g |
| 30 mg | 0.03 g |
| 35 mg | 0.035 g |
| 40 mg | 0.04 g |
| 45 mg | 0.045 g |
| 50 mg | 0.05 g |
| 60 mg | 0.06 g |
| 70 mg | 0.07 g |
| 75 mg | 0.075 g |
| 80 mg | 0.08 g |
| 90 mg | 0.09 g |
| 100 mg | 0.1 g |
| 120 mg | 0.12 g |
| 125 mg | 0.125 g |
| 150 mg | 0.15 g |
| 175 mg | 0.175 g |
| 180 mg | 0.18 g |
| 200 mg | 0.2 g |
| 225 mg | 0.225 g |
| 250 mg | 0.25 g |
| 275 mg | 0.275 g |
| 300 mg | 0.3 g |
| 350 mg | 0.35 g |
| 400 mg | 0.4 g |
| 450 mg | 0.45 g |
| 500 mg | 0.5 g |
| 600 mg | 0.6 g |
| 750 mg | 0.75 g |
| 1000 mg | 1 g |
| 2000 mg | 2 g |
| 5000 mg | 5 g |
A grain of table salt weighs about 0.3 mg. A standard aspirin tablet contains 325 mg of active ingredient.
The milligram (mg) equals one-thousandth of a gram, or one-millionth of a kilogram. It is the standard unit for drug dosages on pharmaceutical labels, vitamin and supplement content, and fine laboratory measurements where a gram would be too coarse.
The gram (g) is a metric unit of mass equal to one-thousandth of a kilogram. It is the everyday unit for food labeling, postage, jewelry, and laboratory measurements. The 2019 SI redefinition fixed the kilogram (and therefore the gram) in terms of Planck's constant, ending more than a century of dependence on a physical prototype.
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