Ounces to Milligrams Conversion

How many milligrams in an ounce?

There are 28349.5 mg in an ounce (1 oz = 28349.5 mg).

To convert between ounces and milligrams, enter an ounce or a milligram value into the converter and the result will be displayed.

Round:
Enter Ounce (oz)
Enter Milligram (mg)

Ounces to milligrams (oz to mg) conversion factor is 28349.5231. To find out how many milligrams in ounces, multiply the ounce value by 28349.5231.

1 Ounce = 28 349.5231 Milligrams

Ounce is an imperial and US Customary mass unit. Troy ounce is used for the measurement of precious metals, gold, silver etc. The abbreviation is "oz".

Milligram is a small unit of mass in the metric system. The abbreviation is "mg".

Create Custom Conversion Table
To create your own custom conversion table click "Create Table" botton. To change values, you may enter a "Start" value (1, 2.5, 5 etc), select a an "Increment" value (0.01, 5, 100 etc) and select an "Accuracy" value to round the result.