Gram to Milligram Converter
Type a value — the answer appears instantly. 1 g = 1,000 mg.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
1,000 milligrams
= 0.001 kg= 0.00220462 lb
equals 1,000 milligramsFormula: mg = g × 1000
Gram to Milligram formula
mg = g × 1000
Convert 5 grams to milligrams
- Start with 5 grams.
- Multiply by the conversion factor: 5 × 1,000 = 5,000.
- So 5 g = 5,000 mg.
Gram to Milligram conversion table
| Grams (g) | Milligrams (mg) |
|---|---|
| 0.01 g | 10 mg |
| 0.1 g | 100 mg |
| 0.25 g | 250 mg |
| 0.5 g | 500 mg |
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 4 g | 4,000 mg |
| 5 g | 5,000 mg |
| 6 g | 6,000 mg |
| 7 g | 7,000 mg |
| 8 g | 8,000 mg |
| 9 g | 9,000 mg |
| 10 g | 10,000 mg |
| 15 g | 15,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 30 g | 30,000 mg |
| 40 g | 40,000 mg |
| 50 g | 50,000 mg |
| 75 g | 75,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
| 5,000 g | 5,000,000 mg |
| 10,000 g | 10,000,000 mg |
Unit definitions
What is a gram?
The gram is one thousandth of a kilogram and the everyday metric unit for food, cooking, and postage. Nutrition labels, recipes, and letter weights are all given in grams. A standard paperclip weighs about one gram.
What is a milligram?
The milligram is one millionth of a kilogram, or one thousandth of a gram. It is the standard unit for dosing medication, vitamins, and nutritional supplements, and for weighing very small quantities in laboratories. A grain of table salt weighs roughly one milligram.
Frequently asked questions
How many milligrams are in one gram?
One gram equals 1,000 milligrams (1 g = 1,000 mg).
How do I convert grams to milligrams?
Multiply the value in grams by 1,000. For example, 10 g × 1,000 = 10,000 mg.
Which is bigger — a gram or a milligram?
A gram is bigger: one gram contains 1,000 milligrams.
Is this gram to milligram converter free?
Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.
Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.