An avoirdupois ounce equals 1/16 pound, or about 28.35 grams, common in US recipes.
Ounce to Milligram
Convert Ounce to Milligram instantly. Free online cooking unit converter with exact formula, conversion table and FAQ.
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Cooking Converter
Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
The milligram is one-thousandth of a gram, used for very small ingredient amounts such as spices or additives.
mg = oz × 28349.52313
Results update instantly for Ounce to Milligram conversions.
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Formula
mg = oz × 28349.52313
oz = mg × 3.527396195e-05
Conversion table
| 1 oz | 28349.523125 mg |
| 5 oz | 141747.615625 mg |
| 10 oz | 283495.23125 mg |
| 20 oz | 566990.4625 mg |
| 50 oz | 1417476.15625 mg |
| 100 oz | 2834952.3125 mg |
| 500 oz | 14174761.5625 mg |
| 1000 oz | 28349523.125 mg |
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Frequently asked questions
What is the source unit in this conversion?
The source unit is the ounce (oz). An avoirdupois ounce equals 1/16 pound, or about 28.35 grams, common in US recipes.
What is the destination unit in this conversion?
The destination unit is the milligram (mg). The milligram is one-thousandth of a gram, used for very small ingredient amounts such as spices or additives.
How do I convert ounce to milligram?
Multiply the ounce value by 28349.52313. For example, 10 oz × 28349.52313 = 283495.23125 mg.
Is the ounce to milligram conversion exact?
Yes. This conversion uses a fixed factor defined for cooking measurement standards, so results are consistent every time.
Where is this conversion commonly used?
It's used when following recipes, adjusting ingredient quantities, or converting between US customary and metric cooking measurements.
Can I convert milligram back to ounce?
Yes. Multiply the milligram value by 3.527396195e-05 to get ounce.
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About this conversion
This page converts ounce (oz) to milligram (mg) within the cooking converter.
An avoirdupois ounce equals 1/16 pound, or about 28.35 grams, common in US recipes. The milligram is one-thousandth of a gram, used for very small ingredient amounts such as spices or additives.
The formula is mg = oz × 28349.52313, based on each unit's fixed relationship to the cooking converter's reference units.
Results are consistent because the conversion relies on a fixed numerical ratio rather than an estimate.
Use the calculator above for instant results, or the table below for common ounce values already converted to milligram.