Milligrams to Ounces
Convert milligrams to ounces instantly. 1 mg = 3.5274e-05 oz. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert milligrams to ounces
To convert milligrams to ounces, divide by 28349.523125 (multiply by 3.5274e-05). 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.
oz = mg × 3.5274e-05
Milligrams to Ounces conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Milligrams | Ounces |
|---|---|
| 1 mg | 3.527e-05 oz |
| 2 mg | 7.055e-05 oz |
| 3 mg | 0.0001058 oz |
| 5 mg | 0.0001764 oz |
| 10 mg | 0.0003527 oz |
| 20 mg | 0.0007055 oz |
| 25 mg | 0.0008818 oz |
| 50 mg | 0.001764 oz |
| 100 mg | 0.003527 oz |
| 500 mg | 0.017637 oz |
| 1,000 mg | 0.035274 oz |
What is a milligram?
A thousandth of a gram. Standard for medication strength.
What is a ounce?
A sixteenth of a pound, exactly 28.349523125 g.
The formula
oz = mg × 3.5274e-05
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 Ounces
- Type the number of milligrams you want to convert.
- Read the result in ounces 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 ounces to milligrams page.
Milligrams to Ounces — frequently asked questions
How many ounces are in a milligram?
One milligram equals 3.5274e-05 oz. oz = mg × 3.5274e-05
What is the formula to convert milligrams to ounces?
The formula is oz = mg × 3.5274e-05. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert ounces back to milligrams?
Divide instead of multiplying: one ounce is 28349.523125 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 ounces 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