Ounces to milligrams (oz to mg) conversion factor is 28349.5231 (for troy weight, it is 31103.4768). To find out how many milligrams in ounces, multiply by the conversion factor or use the converter.
1 Ounce = 28 349.5231 Milligrams
Ounce is an imperial and US 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".