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weight conversion

How many milligrams are in 1 ounce?

Quick answer, a live calculator, and reference values for converting ounces to milligrams.

Main answer
1 ounce = 28,349.5 milligrams
Result
1 ounce = 28,349.5 milligrams

Factor: 28349.5

There are 28,349.5 milligrams in 1 ounce.

1 ounce equals 28,349.5 milligrams. An ounce is a common weight unit for food, parcels, and everyday items. A milligram is another weight unit you'll often see on scales and nutrition labels. To convert any amount, multiply the number of ounces by 28349.5 to get milligrams. Results below use standard international conversion factors; round as needed for recipes or construction.
Need the other direction?
Convert milligrams to ounces.

Examples

  • 1 ounce
    28,349.5 milligrams
  • 5 ounces
    141,747.5 milligrams
  • 10 ounces
    283,495 milligrams
  • 100 ounces
    2,834,950 milligrams

Frequently asked questions

How many milligrams are in 1 ounce?
There are 28,349.5 milligrams in 1 ounce.
How do I convert ounces to milligrams?
Multiply the ounces value by 28349.5. You can also type any number into the calculator on this page for an instant result.
Is the ounces to milligrams conversion exact?
This page uses internationally recognized conversion factors. Displayed values may be rounded for readability—keep extra decimals when a recipe, blueprint, or lab measurement needs higher precision.

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