Ounces to Milligrams converter

To convert ounces to milligrams, enter the value in the first field. The result in milligrams is calculated automatically using the exact conversion factor.

1 oz = 28349.523125 mg
1 mg ≈ 0.0000352739619496 oz

Formula: mg = oz × 28349.523125
oz ≈ mg × 0.0000352739619496

Definitions: 1 oz = 1/16 lb; 1 mg = 0.001 g

The ounce (oz) here is the avoirdupois ounce, one sixteenth of a pound, or exactly 28.349523125 grams. It is used in the United States for food packages, postage and small goods, and it is not the same as the troy ounce used for precious metals or the fluid ounce, which measures volume.

The milligram (mg) is one thousandth of a gram. It is the standard unit for doses of medicines and supplements, and for nutrients such as sodium and caffeine on food labels.

See the conversion table with commonly used values, handy for quick reference or study.