Convert milligrams to ounces
Converting milligrams to ounces is a common weight task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 mg equals 0.000035274 oz, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert milligrams to ounces
To convert milligrams to ounces, multiply the number of milligrams by 0.000035274. For example, 10 mg × 0.000035274 = 0.00035274 oz.
oz = mg × 0.000035274
- Write down the value in milligrams you want to convert.
- Multiply it by 0.000035274 (the exact mg→oz factor).
- The result is your value in ounces. Check it below with the converter or the table.
Conversion table
Common values of milligrams and their equivalents in ounces:
| mg | oz |
|---|---|
| 1 | 0.000035274 |
| 2 | 0.0000705479 |
| 3 | 0.000105822 |
| 4 | 0.000141096 |
| 5 | 0.00017637 |
| 10 | 0.00035274 |
| 20 | 0.000705479 |
| 25 | 0.000881849 |
| 50 | 0.0017637 |
| 100 | 0.0035274 |
| 250 | 0.00881849 |
| 500 | 0.017637 |
About these units
Milligram (mg). A milligram is one thousandth of a gram, used for medication doses, vitamins and chemical additives. Precision at this scale matters in pharmacology and nutrition labeling.
Ounce (oz). The avoirdupois ounce is a US customary unit defined as exactly 28.349523125 grams, or 1/16 of a pound. Food portions and packaged goods in the US are labeled in ounces.
Frequently asked questions
How do I convert milligrams to ounces?
To convert milligrams to ounces, multiply the number of milligrams by 0.000035274. For example, 10 mg × 0.000035274 = 0.00035274 oz. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many ounces are in 1 milligram?
1 mg = 0.000035274 oz. That is the fixed relationship used by this converter and by international standards.
How many milligrams are in 1 ounce?
1 oz = 28,349.5 mg. If you are converting in the opposite direction, use our Ounce to Milligram converter for the dedicated table and FAQ.
Is the milligrams to ounces conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.000035274 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is milligram used for?
A milligram is one thousandth of a gram, used for medication doses, vitamins and chemical additives. Precision at this scale matters in pharmacology and nutrition labeling.