Convert Ounces to Milligrams
oz to mg · weight & mass conversion
What are ounces and milligrams?
An ounce is 1/16 of a pound (about 28.35 g), common for food portions and mail in the US. A milligram is one-thousandth of a gram, used for medication doses and tiny quantities. For scale: a 70 kg adult weighs about 154 lb, and a bag of sugar is usually 1 kg (2.2 lb).
How to convert ounces to milligrams
1 oz = 28,349.5 mg. To convert, multiply the number of ounces by 28,349.5. For example, 5 oz = 141,748 mg, and 20 oz = 566,990 mg. To go the other way, multiply milligrams by 0.000035274 (since 1 mg = 0.000035274 oz).
Ounces to Milligrams conversion table
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 1 | 28,349.5 |
| 2 | 56,699 |
| 5 | 141,748 |
| 10 | 283,495 |
| 25 | 708,738 |
| 50 | 1,417,480 |
| 100 | 2,834,950 |
FAQ
What is 1 oz in mg?
1 oz = 28,349.5 mg. To convert any amount, multiply the number of ounces by 28,349.5.
How do I convert milligrams back to ounces?
Go the other way: 1 mg = 0.000035274 oz, so multiply milligrams by 0.000035274 to get ounces.
Is a ounce bigger than a milligram?
Yes — 1 oz is the larger unit, equal to 28,349.5 mg.
Are these weight & mass conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.