How to convert ounces to milligrams
mg = oz × 28,349.52313Multiply the value in ounces by 28,349.52313. To go the other way, multiply by 0.00003527396195 (or divide by 28,349.52313).
An ounce is larger than a milligram: one ounce contains 28,349.52313 milligrams.
Worked examples
- 1 ounce1 oz × 28,349.52313 = 28,349.52313 mg
- 5 ounces5 oz × 28,349.52313 = 141,747.6156 mg
- 10 ounces10 oz × 28,349.52313 = 283,495.2313 mg
- 20 ounces20 oz × 28,349.52313 = 566,990.4625 mg
- 100 ounces100 oz × 28,349.52313 = 2,834,952.313 mg
Ounces to milligrams conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 0.1 oz | 2,834.9523 mg |
| 0.25 oz | 7,087.3808 mg |
| 0.5 oz | 14,174.762 mg |
| 1 oz | 28,349.523 mg |
| 2 oz | 56,699.046 mg |
| 3 oz | 85,048.569 mg |
| 4 oz | 113,398.09 mg |
| 5 oz | 141,747.62 mg |
| 6 oz | 170,097.14 mg |
| 7 oz | 198,446.66 mg |
| 8 oz | 226,796.19 mg |
| 9 oz | 255,145.71 mg |
| 10 oz | 283,495.23 mg |
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 12 oz | 340,194.28 mg |
| 15 oz | 425,242.85 mg |
| 20 oz | 566,990.46 mg |
| 25 oz | 708,738.08 mg |
| 30 oz | 850,485.69 mg |
| 40 oz | 1,133,980.9 mg |
| 50 oz | 1,417,476.2 mg |
| 75 oz | 2,126,214.2 mg |
| 100 oz | 2,834,952.3 mg |
| 250 oz | 7,087,380.8 mg |
| 500 oz | 14,174,762 mg |
| 1,000 oz | 28,349,523 mg |
About the units
Ounce (oz)
One sixteenth of a pound: exactly 28.349523125 g. Not to be confused with the fluid ounce (volume) or the troy ounce used for precious metals. One ounce equals 0.02834952313 kilograms (kg).
Milligram (mg)
One thousandth of a gram. Medication doses and vitamin contents are usually given in milligrams. One milligram equals 0.000001 kilograms (kg).
Frequently asked questions
How many milligrams are in one ounce?
There are 28,349.52313 milligrams in one ounce, and this value is exact by definition.
How do I convert ounces to milligrams?
Multiply the number of ounces by 28,349.52313. For example, 10 oz × 28,349.52313 = 283,495.2313 mg.
How many ounces are in one milligram?
One milligram equals 0.00003527396195 ounces. That is the reverse factor, 1 ÷ 28,349.52313.
What is 10 ounces in milligrams?
10 oz = 283,495.2313 mg.
Is this oz to mg converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.