Grams to Milligrams
A gram is one thousandth of a kilogram, used for cooking ingredients and other small everyday objects. A milligram is one thousandth of a gram, the standard unit for medication dosages on drug labels. 1 g equals 1,000 mg, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to mass, measured here against mass's base unit (kg) — every other mass unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
mg = g × 1,000
g = mg × 0.001
Worked example: 5 g × 1,000 = 5,000 mg.
Conversion table
| Gram (g) | Milligram (mg) |
|---|---|
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
Frequently asked
- How many Milligrams in a gram?
- 1 g equals 1,000 mg.
- How do I convert Grams to Milligrams?
- Multiply the value in g by 1,000 to get mg. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Gram and Milligram are both defined by a fixed conversion factor to mass's base unit (kg), so the result shown is exact to the precision displayed, not an approximation.