How many milligrams are in one gram?
One gram is exactly 1000 milligrams.
Convert Gram (g) to Milligram (mg) instantly.
Choose how you want the answer displayed.
1g=1000mg
| Quick Conversion | Converted |
|---|---|
| 1 g | 1,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 28.35 g | 28,350 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 1,000 g | 1,000,000 mg |
A gram is a metric mass unit equal to one thousandth of a kilogram.
Grams are widely used for food, packaging, recipes, parcels, lab work, and small product weights.
A milligram is a metric mass unit equal to one thousandth of a gram.
Milligrams are common in medicine, nutrition, chemistry, lab work, and small-dose measurements.
Mathematically, milligram (mg) = gram (g) multiplied by the conversion factor shown below.
1 g = 1,000 mg
1 mg = 0.001 g
1 g x 1,000 = 1,000 mg
The mass in milligram (mg) is the mass in gram (g) multiplied by 1,000.
mass(mg) = mass(g) x 1,000
Or:
mg = g x 1,000
Formula: value × 1000
Example: 15 g = 15,000 mg
Convert 28.35 gram to milligram:
28.35 g x 1,000 = 28,350 mg
Convert 250 gram to milligram:
250 g x 1,000 = 250,000 mg
Precision note: Use the exact relationship of 1000 milligrams per gram. Keep decimal grams until after conversion when the source value includes fractions.
1 g = 1,000 mg
1 mg = 0.001 g
If you are starting with milligram instead, use the milligrams to grams page.
| Gram [g] | Milligram [mg] |
|---|---|
| 0.1 g | 100 mg |
| 0.5 g | 500 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 15 g | 15,000 mg |
| 20 g | 20,000 mg |
| 30 g | 30,000 mg |
| 75 g | 75,000 mg |
| 150 g | 150,000 mg |
| 200 g | 200,000 mg |
| 500 g | 500,000 mg |
| 750 g | 750,000 mg |
One gram is exactly 1000 milligrams.
One milligram is exactly 0.001 grams.
Use milligrams for very small quantities, supplements, nutrition details, lab samples, and precise chemical amounts.