Milligrams to Ounces
Convert milligrams (mg) to ounces (oz). Both measure mass and weight, and the conversion comes up in cooking, shipping, fitness work.
The Formula
``
ounces = milligrams × 0.0000352739619496
milligrams = ounces × 28349.523125
`
One milligram is 3.5274e-5 ounces, and one ounce is 28,349.52 milligrams.
Conversion Table
| Milligrams | Ounces |
|---|---|
| 1 mg | 3.5274e-5 oz |
| 2 mg | 7.0548e-5 oz |
| 5 mg | 1.7637e-4 oz |
| 10 mg | 3.5274e-4 oz |
| 25 mg | 8.8185e-4 oz |
| 50 mg | 0.001764 oz |
| 100 mg | 0.003527 oz |
| 500 mg | 0.017637 oz |
| 1,000 mg | 0.035274 oz |
The Other Direction
| Ounces | Milligrams |
|---|---|
| 1 oz | 28,349.52 mg |
| 2 oz | 56,699.05 mg |
| 5 oz | 141,747.62 mg |
| 10 oz | 283,495.23 mg |
| 25 oz | 708,738.08 mg |
| 50 oz | 1,417,476.16 mg |
| 100 oz | 2,834,952.31 mg |
| 500 oz | 14,174,761.56 mg |
| 1,000 oz | 28,349,523.13 mg |
What Each Unit Is
Milligrams (mg) — one thousandth of a gram. The metric unit for doses and trace quantities.
Ounces (oz) — one sixteenth of a pound, or exactly 28.349523125 grams. From uncia, one twelfth — of the Roman libra, before avoirdupois moved it to one sixteenth.
A Sense of Scale
A grain of sand is about 1 mg- An aspirin tablet is 300–500 mg
- Nutrition labels use mg for sodium
- A slice of bread is about 1 oz
- A tennis ball is 2 oz
- US recipes use ounces for dry goods
Precision
The factor 0.0000352739619496 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
- A fluid ounce measures volume, not mass, and the two are only interchangeable for water by coincidence of scale.
In Code
`javascript
const milligramToOunce = (value) => value * 0.0000352739619496;
``
Where This Conversion Comes Up
- Cooking
- Shipping
- Fitness
- Medicine
- Manufacturing
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 mg with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 mg becomes | Error |
|---|---|---|---|
| 0 | 0 | 0 | 100.0000% |
| 1 | 0 | 0 | 100.0000% |
| 2 | 0 | 0 | 100.0000% |
| 3 | 0 | 0 | 100.0000% |
| 4 | 0 | 0 | 100.0000% |
The right number of significant figures is set by your input, not by the converter. If you measured milligrams to three significant figures, the answer in ounces is only good to three — writing more digits claims precision the measurement never had.