Convert ounces to milligrams
1 oz = 28,349.52 mg. Change the amount below, or read the formula and the reference table further down.
1 ounce equals
milligrams
1 oz = 28,349.52 mg
The formula
Ounces and milligrams both measure weight & mass from the same zero, so a single multiplier does the job.
mg = oz × 28,349.52
Going the other way? Convert milligrams to ounces.
Ounces to milligrams table
Common values, rounded for reading.
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 1 | 28,349.52 |
| 2 | 56,699.05 |
| 3 | 85,048.57 |
| 4 | 113,398.09 |
| 5 | 141,747.62 |
| 6 | 170,097.14 |
| 7 | 198,446.66 |
| 8 | 226,796.19 |
| 9 | 255,145.71 |
| 10 | 283,495.23 |
| 15 | 425,242.85 |
| 20 | 566,990.46 |
| 25 | 708,738.08 |
| 30 | 850,485.69 |
| 40 | 1,133,980.93 |
| 50 | 1,417,476.16 |
| 75 | 2,126,214.23 |
| 100 | 2,834,952.31 |
| 250 | 7,087,380.78 |
| 500 | 14,174,761.56 |
| 1,000 | 28,349,523.13 |
Questions people ask
- How many milligrams are in a ounce?
- One ounce equals 28,349.52 milligrams.
- How do I convert ounces to milligrams by hand?
- Multiply the number of ounces by 28,349.52. For a rough check, 28,349.52 is close enough for most everyday use.
- What is 1 ounce in milligrams?
- 1 ounce is 28,349.52 milligrams.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.