weight conversion

How many milligrams are in 1 ounce?

Quick answer, a live calculator, and reference values—built for fast, mobile-friendly lookups.

Main answer

1 ounce = 28,349.5 milligrams

Amount (ounces)

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.

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

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