Milligrams to Grams
Convert milligrams to grams instantly. 1 mg = 0.001 g. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert milligrams to grams
To convert milligrams to grams, divide by 1,000 (multiply by 0.001). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
g = mg × 0.001
Milligrams to Grams conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Milligrams | Grams |
|---|---|
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 3 mg | 0.003 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 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 |
| 1,000 mg | 1 g |
What is a milligram?
A thousandth of a gram. Standard for medication strength.
What is a gram?
A thousandth of a kilogram, and the practical unit for cooking by weight.
The formula
g = mg × 0.001
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Milligrams to Grams
- Type the number of milligrams you want to convert.
- Read the result in grams straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked grams to milligrams page.
Milligrams to Grams — frequently asked questions
How many grams are in a milligram?
One milligram equals 0.001 g. g = mg × 0.001
What is the formula to convert milligrams to grams?
The formula is g = mg × 0.001. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert grams back to milligrams?
Divide instead of multiplying: one gram is 1,000 mg. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this milligrams to grams free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error