Ounces to milligrams conversion factor is 28349.5231 (for troy weight, it is 31103.4768). To find out how many milligrams in an ounce, multiply by the conversion factor or simply use the converter below.
1 Ounce = 28 349.5231 Milligrams
1 Troy Ounce = 31 103.4768 Milligram
Ounce is an imperial and U.S. customary mass unit. The commonly used ounces are the international avoirdupois and the troy ounce. 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 metric system and used commonly in medicine, pharmacy etc. The abbreviation is "mg".
For other units of weight conversion, please go to Weight Conversion