Ounces to milligrams converter
Convert ounces to milligrams with an editable calculator, worked example, formula and reference table. Check the unit definitions before you convert.
Updated · How we checkUse a decimal point, such as 2.5. Enter a value in oz; the result is in mg.
Formula
Worked example
Convert 10 oz to mg:
10 oz ≈ 283,495.2313 mg
Multiply your oz value by the factor above. The calculator uses the full conversion factor before rounding the displayed answer.
Ounces to milligrams table
Reference values rounded to 10 significant digits. Use the converter above for other amounts.
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 0.1 | ≈ 2,834.952313 |
| 0.5 | ≈ 14,174.76156 |
| 1 | ≈ 28,349.52313 |
| 2 | ≈ 56,699.04625 |
| 5 | ≈ 141,747.6156 |
| 10 | ≈ 283,495.2313 |
| 25 | ≈ 708,738.0781 |
| 50 | ≈ 1,417,476.156 |
| 100 | ≈ 2,834,952.313 |
| 1000 | ≈ 28,349,523.13 |
Understanding ounces
This is the avoirdupois ounce of mass, exactly 28.349523125 grams. It is not a fluid ounce or a troy ounce.
Understanding milligrams
A milligram is one thousandth of a gram. This tool changes mass units only; it does not calculate a medication dose or convert a concentration to a dose.
Precision and rounding
The calculator keeps decimal precision during the conversion. Displayed values use up to 10 significant digits; an approximation sign marks the reference results. Keep extra digits until your final measurement or purchase decision.
References
Definitions and method references. Example rates and prices on this page are editable assumptions.