Convert Ounces to Milligrams
One ounce equals 28,349.5 milligrams. Type any value to convert ounces to milligrams instantly — with a full reference table below.
Convert Ounces to Milligrams
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Conversion formula
To convert ounces to milligrams, multiply by 28,349.5. One ounce equals 28,349.5 mg, and one milligram equals 0.000035 oz.
Ounces to Milligrams table
About converting Ounces to Milligrams
Ounces (oz) and Milligrams (mg) are both units of weight. The exact factor is 1 oz = 28,349.5 mg, so multiply by 28,349.5 to go from ounces to milligrams (or divide to go back).
The conversion is exact and runs entirely in your browser. Need the reverse? Use the Milligrams to Ounces converter, or the full unit converter for every unit at once.
Frequently asked questions
How many milligrams are in one ounce?
One ounce equals 28,349.5 milligrams.
How do I convert ounces to milligrams?
Multiply the number of ounces by 28,349.5. For example, 10 ounces = 283,495 milligrams.
What is 5 ounces in milligrams?
5 ounces is 141,747.5 milligrams.