1 milligram = 0.001 grams
Dosage errors between milligrams and grams are a recognised clinical hazard, which is why prescriptions spell the unit out rather than abbreviating it.
Formula g = mg × 0.001
Type in either field — the other updates on every keystroke. Need other units? Open the full weight converter.
| Milligram | Gram |
|---|---|
| 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 |
| 10 mg | 0.01 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 |
| 500 mg | 0.5 g |
| 1000 mg | 1 g |
| Gram | Milligram |
|---|---|
| 1 g | 1000 mg |
| 2 g | 2000 mg |
| 3 g | 3000 mg |
| 4 g | 4000 mg |
| 5 g | 5000 mg |
| 10 g | 10000 mg |
| 15 g | 15000 mg |
| 20 g | 20000 mg |
| 25 g | 25000 mg |
| 50 g | 50000 mg |
| 100 g | 100000 mg |
| 500 g | 500000 mg |
| 1000 g | 1000000 mg |
| Situation | From | To |
|---|---|---|
| Pinch of salt | 300 mg | 0.3 g |
| Vitamin tablet | 500 mg | 0.5 g |
| One gram | 1,000 mg | 1 g |
| Sugar sachet | 4,000 mg | 4 g |
| Teaspoon of salt | 6,000 mg | 6 g |
| Ten grams | 10,000 mg | 10 g |
Move the decimal point three places to the left. 500 mg is 0.5 g.
Supplement and medicine labels use milligrams, while recipes and kitchen scales use grams. The WHO suggests adults eat less than 5 g of salt a day, which is 5,000 mg.
Milligrams (mg) are not micrograms (mcg or µg): 1 mg is 1,000 µg. Mixing them up is a thousandfold error, so follow the label or a pharmacist for doses.
Milli means one thousandth, so a milligram is 0.001 g, or one millionth of a kilogram.
Supplements and medicines are labelled in milligrams: 500 mg is 0.5 g and 1,000 mg is 1 g.
Related guides: Imperial vs metric: differences and quick conversion tricks