Convert Ounce to Milligram
Use this free converter to change ounces (oz) into milligrams (mg). Ounce and milligram both measure weight & mass. As a quick reference, 1 oz equals 28349.523 mg, and 1 mg equals 0.000035273962 oz.
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Milligram (mg)
28349.523
1 oz = 28349.523 mg
Weight & Mass conversion table
| Ounce | Milligram |
|---|---|
| 0.01 | 283.49523 |
| 0.1 | 2834.9523 |
| 0.5 | 14174.762 |
| 1 | 28349.523 |
| 2 | 56699.046 |
| 3 | 85048.569 |
| 5 | 141747.62 |
| 10 | 283495.23 |
| 20 | 566990.46 |
| 25 | 708738.08 |
| 50 | 1417476.2 |
| 100 | 2834952.3 |
| 1,000 | 28349523 |
How to convert Ounce to Milligram
Multiply the ounce value by 28349.523 to get milligrams.
- Enter the number of ounces you want to convert.
- The converter instantly shows the equivalent value in milligrams.
- Worked example: 15 oz × 28349.523 = 425242.85 mg.
- Use the swap button to reverse the conversion (milligram to ounce).
About these units
Ounce (oz)
- Definition
- An ounce (oz) is an imperial unit of mass equal to one sixteenth of a pound, about 28.35 grams.
- History
- It also descends from the Roman "uncia" (a twelfth) and was later fixed at 1/16 of the avoirdupois pound.
- Current use
- Ounces measure food portions, postal weights, and ingredients in the US and UK.
Milligram (mg)
- Definition
- A milligram (mg) is one thousandth of a gram, used for very small masses such as medication doses.
- History
- It is a standard metric subdivision using the prefix "milli-" (one thousandth).
- Current use
- Milligrams express drug dosages, vitamin content, and quantities in chemistry and pharmacology.
Frequently asked questions
How many milligrams are in a ounce?
There are 28349.523 mg in 1 oz. To convert, multiply the number of ounces by 28349.523.
How do I convert ounces to milligrams?
Multiply the ounce value by 28349.523 to get milligrams. For example, 10 oz = 283495.23 mg.
Is this ounce-to-milligram converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Ounce to other weight & mass units
| Unit | 1 Ounce equals |
|---|---|
| Kilogram (kg) | 0.028349523 kg |
| Gram (g) | 28.349523 g |
| Milligram (mg) | 28349.523 mg |
| Microgram (µg) | 28349523 µg |
| Metric Ton (t) | 0.000028349523 t |
| Pound (lb) | 0.0625 lb |
| Stone (st) | 0.0044642857 st |
| US Ton (ton) | 0.00003125 ton |
| Imperial Ton (long ton) | 0.000027901786 long ton |
| Carat (ct) | 141.74762 ct |