⚖️ Weight & Mass
oz to mg Converter
Convert oz to mg instantly with a reference conversion table.
Quick answer: To convert oz to mg, multiply by 28349.5. For example, 1 oz = 28349.5 mg. Use the calculator below for any value.
oz to mg
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Common conversions
| oz | mg |
|---|
Formula:
How to convert oz to mg
1
Enter your value
Type the number of oz you want to convert into the left box. The result in mg appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — mg to oz. Your current value carries across so you don't have to re-enter anything.
3
About oz and mg
oz and mg are common weight measurements.
📊 Common conversions at a glance
| oz | mg |
|---|---|
| 3.53e-05 | 1.001 |
| 0.001 | 28.35 |
| 0.01 | 283.5 |
| 0.1 | 2835 |
| 0.5 | 1.417e+04 |
| 1 | 2.835e+04 |
Reviewed for 2026. oz ↔ mg conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert oz to mg?
To convert oz to mg, multiply by 28349.5. Or use the calculator above for instant results.
How many mg are in 1 oz?
1 oz equals 28349.5 mg.
Is the oz to mg converter free?
Yes, the oz to mg converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.