Ounces to Milligrams Converter
1 ounce ≈ 28,349.5231 milligrams
A unit of mass. The fluid ounce is a unit of volume and lives in the Volume category.
1 ounce equals 28,349.5 milligrams
How to convert ounces to milligrams
These units measure mass. Pounds and ounces mean avoirdupois unless the unit explicitly says troy; a fluid ounce measures volume and requires a density to relate it to mass.
mg = oz × 28349.52313One ounce is 28349.52313 milligrams, so a single multiplication converts any value.
283,495 mg ≈ 10 × 28349.52313A unit of mass. The fluid ounce is a unit of volume and lives in the Volume category.
Ounces to milligrams conversion table
Common values in ounces, converted to milligrams.
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 1 | 28,349.523 |
| 2 | 56,699.046 |
| 3 | 85,048.569 |
| 4 | 113,398.09 |
| 5 | 141,747.62 |
| 10 | 283,495.23 |
| 20 | 566,990.46 |
| 25 | 708,738.08 |
| 50 | 1,417,476.2 |
| 100 | 2,834,952.3 |
| 250 | 7,087,380.8 |
| 500 | 14,174,762 |
| 1,000 | 28,349,523 |
About these units
ounceoz
The avoirdupois ounce: exactly 1/16 pound.
milligrammg
One thousandth of a gram, the standard unit for medication doses.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.