Ounce to Milligram Converter (oz to mg)

How to Convert Ounce to Milligram

Formula: Milligram = Ounce × 28,349.523

Example: 1 oz = 28,349.523 mg

You can also use the interactive converter above. Simply enter any Ounce value and the equivalent Milligram value will appear instantly. Click the ⇄ button to reverse the conversion.

A little context on Ounce and Milligram helps this conversion stick, along with some frequently asked questions below.

Step-by-step example — Convert 8 oz to mg:

What is Ounce and Milligram?

An Ounce (oz) is one-sixteenth of an avoirdupois pound, commonly used for smaller weights in the US customary system.

A Milligram (mg) is one-thousandth of a gram, a very small unit reserved for precise, low-mass measurements.

Real World Uses of Ounce to Milligram Conversion

• Ounce: Commonly used for measuring food portion sizes and packaged snack weights.
• Milligram: Commonly used for recording sample mass in chemistry and laboratory work.
• Ounce: Commonly used in the US for postage weight and small food portions.
• Milligram: Commonly used to state vitamin and mineral amounts on supplement and medicine labels.

Frequently Asked Questions

What is the formula to convert Ounce to Milligram?

The formula is: Milligram = Ounce x 28349.523. Multiply any Ounce value by 28349.523 to get the equivalent in Milligram.

What is 1 Ounce in Milligram?

1 oz = 28349.523 mg.

How many Ounce are in 1 Milligram?

1 mg = 0.00003527396 oz.

Is Ounce bigger or smaller than Milligram?

Ounce is bigger than Milligram. 1 Ounce = 28349.523 mg.

What is 16 oz in mg?

16 oz = 453,592.368 mg.

What is 250 mg in oz?

250 mg = 0.008818490526 oz.

Is an ounce of weight the same as a fluid ounce?

No — an ounce (oz) measures weight, while a fluid ounce (fl oz) measures volume. They share a name but measure completely different things.