1 g = 1000 mg (gram → milligram)
1 g = 1000 mg
1 gram equals 1000 milligrams. To convert grams to milligrams, multiply the gram value by 1000. For quick reference: 1 g = 1000 mg, 5 g = 5000 mg, 10 g = 10000 mg, 100 g = 100000 mg.
Milligrams = Grams × 1000Start with your value in grams.
Multiply the gram value by 1000. This is the exact conversion factor from grams to milligrams.
The product is your value in milligrams. For example, 5 g × 1000 = 5000 mg.
The exact factor from grams to milligrams is 1000.
Milligrams = Grams × 1000
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Grams (g) | Milligrams (mg) |
|---|---|
| 0.1 g | 100 mg |
| 0.25 g | 250 mg |
| 0.5 g | 500 mg |
| 1 g | 1000 mg |
| 1.5 g | 1500 mg |
| 2 g | 2000 mg |
| 2.5 g | 2500 mg |
| 3 g | 3000 mg |
| 4 g | 4000 mg |
| 5 g | 5000 mg |
| 6 g | 6000 mg |
| 7 g | 7000 mg |
| 8 g | 8000 mg |
| 9 g | 9000 mg |
| 10 g | 10000 mg |
| 12 g | 12000 mg |
| 15 g | 15000 mg |
| 18 g | 18000 mg |
| 20 g | 20000 mg |
| 25 g | 25000 mg |
| 30 g | 30000 mg |
| 35 g | 35000 mg |
| 40 g | 40000 mg |
| 45 g | 45000 mg |
| 50 g | 50000 mg |
| 60 g | 60000 mg |
| 70 g | 70000 mg |
| 75 g | 75000 mg |
| 80 g | 80000 mg |
| 90 g | 90000 mg |
| 100 g | 100000 mg |
| 120 g | 120000 mg |
| 125 g | 125000 mg |
| 150 g | 150000 mg |
| 175 g | 175000 mg |
| 180 g | 180000 mg |
| 200 g | 200000 mg |
| 225 g | 225000 mg |
| 250 g | 250000 mg |
| 275 g | 275000 mg |
| 300 g | 300000 mg |
| 350 g | 350000 mg |
| 400 g | 400000 mg |
| 450 g | 450000 mg |
| 500 g | 500000 mg |
| 600 g | 600000 mg |
| 750 g | 750000 mg |
| 1000 g | 1000000 mg |
| 2000 g | 2000000 mg |
| 5000 g | 5000000 mg |
A standard paperclip is about 1 g. A US nickel weighs 5 g. A small pencil weighs around 7 g. In milligrams, that gives you: 1 g = 1000 mg, 10 g = 10000 mg, 100 g = 100000 mg.
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.
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.
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