Ounces to Milligrams Converter
Convert ounce to milligram instantly. Type a value below — the result updates as you type.
When you need to convert ounce to milligram
Weight and mass conversions matter for cooking, shipping, fitness tracking and travel, where a parcel, body weight or recipe amount may be labelled in a system you don't use day to day.
Typical values: 0.5 oz is about 14174.8 mg, and 5 oz works out to roughly 141748 mg. Because the ratio is fixed at 28349.5, you can scale any amount linearly — doubling the ounces doubles the milligrams.
Bathroom scales, kitchen scales and shipping labels frequently mix metric and imperial, so converting cleanly avoids costly mistakes.
How to convert ounce to milligram
One ounce equals 28349.5 milligrams. To convert, multiply the number of ounces by 28349.5:
milligrams = ounces × 28349.5
For example, 10 ounces × 28349.5 = 283495 milligrams.
Ounces to milligrams conversion table
| Weight (oz) | Milligrams (mg) |
|---|---|
| 1 oz | 28349.5 mg |
| 2 oz | 56699 mg |
| 3 oz | 85048.6 mg |
| 5 oz | 141748 mg |
| 10 oz | 283495 mg |
| 20 oz | 566990 mg |
| 50 oz | 1.41748e+06 mg |
| 100 oz | 2.83495e+06 mg |
FAQ
How many milligrams are in a ounce?
One ounce = 28349.5 milligrams.
How do I convert milligrams back to ounces?
Divide by 28349.5, or use the milligrams to ounces converter.