Weight converter
Grams to Milligrams
If you need to know how many Milligrams one Grams contains, the answer is 1,000. The conversion is linear, so 10 g is 10,000 mg and 100 g is 100,000 mg. Use the converter for any other value.
Formula 1 g = 1,000 mg
Need the other direction? Milligrams to Grams.
How to convert Grams to Milligrams
The gram is one thousandth of a kilogram and is common in cooking and chemistry. The milligram is one thousandth of a gram and is standard for dosages and trace measurements.
To convert Grams to Milligrams, multiply the value in g by 1,000. For example, 10 g × 1,000 = 10,000 mg. This works because the ratio between the two units is constant for every value in weight.
Worked examples
| g | mg |
|---|---|
| 1 g | 1,000 mg |
| 2.5 g | 2,500 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
Reverse conversion
| mg | g |
|---|---|
| 1 mg | 0.001 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 g |
| 25 mg | 0.025 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
When this conversion is useful
This is the calculation you need when you are comparing body weight, shipping weight or a recipe across metric and imperial units. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 g is 1,000,000 mg.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
g to mg conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Grams (g) | Milligrams (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 |
| 11 g | 11,000 mg |
| 12 g | 12,000 mg |
| 13 g | 13,000 mg |
| 14 g | 14,000 mg |
| 15 g | 15,000 mg |
| 16 g | 16,000 mg |
| 17 g | 17,000 mg |
| 18 g | 18,000 mg |
| 19 g | 19,000 mg |
| 20 g | 20,000 mg |
| 21 g | 21,000 mg |
| 22 g | 22,000 mg |
| 23 g | 23,000 mg |
| 24 g | 24,000 mg |
| 25 g | 25,000 mg |
| 26 g | 26,000 mg |
| 27 g | 27,000 mg |
| 28 g | 28,000 mg |
| 29 g | 29,000 mg |
| 30 g | 30,000 mg |
| 31 g | 31,000 mg |
| 32 g | 32,000 mg |
| 33 g | 33,000 mg |
| 34 g | 34,000 mg |
| 35 g | 35,000 mg |
| 36 g | 36,000 mg |
| 37 g | 37,000 mg |
| 38 g | 38,000 mg |
| 39 g | 39,000 mg |
| 40 g | 40,000 mg |
| 41 g | 41,000 mg |
| 42 g | 42,000 mg |
| 43 g | 43,000 mg |
| 44 g | 44,000 mg |
| 45 g | 45,000 mg |
| 46 g | 46,000 mg |
| 47 g | 47,000 mg |
| 48 g | 48,000 mg |
| 49 g | 49,000 mg |
| 50 g | 50,000 mg |
| 60 g | 60,000 mg |
| 70 g | 70,000 mg |
| 80 g | 80,000 mg |
| 90 g | 90,000 mg |
| 100 g | 100,000 mg |
Frequently asked questions
How many Milligrams are in 1 Grams?
1 g equals 1,000 mg.
How do I convert Grams to Milligrams?
Multiply the g value by 1,000. Example: 25 g = 25,000 mg.
What is 2.5 g in mg?
2.5 g = 2,500 mg.
Is the g to mg conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.