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Weight & Mass
Milligrams to Ounces
Convert milligrams (mg) to ounces (oz). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mg = 3.5274e-5 oz
Milligrams to Ounces Conversion Table
Common values, ready to copy:
| milligrams | ounces |
|---|---|
| 1 mg | 3.5274e-5 oz |
| 2 mg | 7.0548e-5 oz |
| 5 mg | 0.000176 oz |
| 10 mg | 0.000353 oz |
| 25 mg | 0.000882 oz |
| 50 mg | 0.001764 oz |
| 100 mg | 0.003527 oz |
| 1,000 mg | 0.035274 oz |
Formula
ounces = milligrams × 3.52739620e-5
Mass conversions use the SI definition: 1 pound is exactly 0.45359237 kilograms. The factor above is the exact ratio between milligram and ounce.
About Milligrams and Ounces
Milligrams (mg): One thousandth of a gram, used since the metric system was formalized in France in 1799. Common uses: Pharmaceutical dosing (drug tablets, vitamins, supplements), nutrition labels for small quantities, and chemistry.
Ounces (oz): From the Latin uncia meaning one-twelfth (originally 1/12 of a Roman pound, now 1/16 of an avoirdupois pound); the modern avoirdupois ounce is exactly 28.349523125 grams. Common uses: US cooking, postal weight for letters and small parcels, food packaging in the US, and (as a slightly different troy ounce, 31.10 g) the standard unit for precious metals worldwide.
How the conversion works
Mass conversions use the SI definition: 1 pound is exactly 0.45359237 kilograms. The factor above is the exact ratio between milligram and ounce.
The exact relationship is ounces = milligrams × 3.52739620e-5, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between milligrams and ounces comes up wherever weight & mass measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.