Ounces to Milligrams
Convert ounces (oz) to milligrams (mg). Type in either box; the other updates as you go.
How to convert ounces to milligrams
To convert ounces to milligrams, multiply the number of ounces by 28,349.52313.
Example
Convert 5 ounces to milligrams:
Ounce to milligram conversion chart
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 1 oz | 28,349.52 mg |
| 2 oz | 56,699.05 mg |
| 3 oz | 85,048.57 mg |
| 4 oz | 113,398.1 mg |
| 5 oz | 141,747.6 mg |
| 6 oz | 170,097.1 mg |
| 7 oz | 198,446.7 mg |
| 8 oz | 226,796.2 mg |
| 9 oz | 255,145.7 mg |
| 10 oz | 283,495.2 mg |
| 12 oz | 340,194.3 mg |
| 15 oz | 425,242.8 mg |
| 20 oz | 566,990.5 mg |
| 25 oz | 708,738.1 mg |
| 30 oz | 850,485.7 mg |
| 40 oz | 1,133,981 mg |
| 50 oz | 1,417,476 mg |
| 60 oz | 1,700,971 mg |
| 70 oz | 1,984,467 mg |
| 75 oz | 2,126,214 mg |
| 80 oz | 2,267,962 mg |
| 90 oz | 2,551,457 mg |
| 100 oz | 2,834,952 mg |
| 150 oz | 4,252,428 mg |
| 200 oz | 5,669,905 mg |
| 250 oz | 7,087,381 mg |
| 500 oz | 14,174,762 mg |
| 1,000 oz | 28,349,523 mg |
Going the other way? See the milligrams to ounces chart.
About the units
Ounce (oz)
An avoirdupois ounce is one sixteenth of a pound, or 28.349523125 grams. Not to be confused with the fluid ounce, which measures volume.
Milligram (mg)
A milligram is one thousandth of a gram. Medicine doses and nutrition labels use milligrams.
Frequently asked questions
How many milligrams are in an ounce?
There are 28,349.52313 milligrams in an ounce.
How many ounces are in a milligram?
There are 0.00003527396195 ounces in a milligram.
How do you convert ounces to milligrams?
To convert ounces to milligrams, multiply the number of ounces by 28,349.52313.
What is 5 ounces in milligrams?
5 ounces equals 141,748 milligrams.
Convert between kilograms, pounds, ounces, grams, stone and tons. Open the weight converter to see a value in every unit at once.