Milligrams to Ounces Converter

About the mg to oz calculation

One milligram is exactly 0.00003527 ounces, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The usual unit for medication doses and nutrient quantities. Common in US recipes and for postal weights. Not the same as a fluid ounce.

Formula

oz = mg × 0.00003527

1 mg = 0.00003527 oz
1 oz = 28,349.52 mg

Worked example

To convert 500 mg, multiply by 0.00003527: 500 × 0.00003527 = 0.017637 oz.

Frequently asked questions

How many ounces are in a milligram?

There are 0.00003527 ounces in one milligram. To convert any amount, multiply the number of milligrams by 0.00003527.

How do I convert ounces back to milligrams?

Divide instead of multiplying, or equivalently multiply by 28,349.52. One ounce is 28,349.52 milligrams.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between milligrams and ounces is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Milligrams: the usual unit for medication doses and nutrient quantities. Ounces: common in US recipes and for postal weights. Not the same as a fluid ounce.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units