Ounces to milligrams converter
Convert Ounces (oz) to milligrams (mg). Calculate a value, check the formula and compare common measurements.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same mass quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Confusing the source and target units, or overlooking a prefix or case-sensitive symbol.
- Confusing avoirdupois, troy and other explicitly different mass definitions.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the mass measurement guide · Calculation checks, sources and review limits
How do I convert ounces to milligrams?
Enter the value in ounces to find the same mass quantity in milligrams. The number changes to match the unit; the underlying quantity stays the same. Check the definitions below when a unit has more than one convention.
Common uses
- Compare package or equipment masses.
- Translate ingredient weights between mass units.
How it works
For the displayed direction, 1 oz equals 28349.523125 mg. The engine converts through the shared mass base quantity. Pounds and ounces use international avoirdupois mass. US tons are short tons; a metric carat is 200 mg. The multiplier is derived from the two centralized unit factors. Keep full precision until the final result; displayed answers use up to 12 significant digits.
Worked example
10 oz converts to 283495.23125 mg. For the reverse direction, swap the units and enter 283495.23125 mg; the result is approximately 10 oz.
FAQ
How do I convert oz to mg?
mg = oz × 28349.523125
Which definition is used?
Pounds and ounces use international avoirdupois mass. US tons are short tons; a metric carat is 200 mg.
Common values
Use “Swap units” above for the reverse conversion. Values below are rounded to six significant digits.
| Ounces | milligrams |
|---|---|
| 1 | 28349.5 |
| 5 | 141748 |
| 10 | 283495 |
| 20 | 566990 |
| 30 | 850486 |
| 50 | 1417480 |
| 100 | 2834950 |