Ounces to Milligrams converter

1 oz = 28 349.52 mg

Conversion formula

milligrams (mg) = ounces (oz) × 28 349.52

How many milligrams are in an Ounce?

Specifically, one ounce is defined as exactly 28.349523125 grams. To convert grams to milligrams, we multiply by 1,000 (since 1 gram = 1,000 milligrams). Therefore, one ounce is equal to 28,349.523125 milligrams. ​

What is an ounce?

An ounce is a unit of weight utilized in various measurement systems, including the imperial and United States customary systems. Its value varies depending on the specific system in use:​

1. Avoirdupois Ounce: Predominantly used in the United States for general weight measurements, the avoirdupois ounce is defined as 1/16 of an avoirdupois pound, equating to approximately 28.35 grams.

2. Troy Ounce: Employed primarily in the measurement of precious metals like gold and silver, the troy ounce is heavier, defined as 1/12 of a troy pound, or about 31.103 grams.

3. Fluid Ounce: This is a unit of volume rather than weight, used to measure liquids. In the U.S. customary system, a fluid ounce is approximately 29.573 milliliters, whereas in the British imperial system, it is about 28.413 milliliters.

The term "ounce" originates from the Latin word "uncia," meaning "a twelfth part," reflecting its historical use as a fraction of a pound. Despite global moves towards the metric system, the ounce remains widely used in countries like the United States for everyday weight and volume measurements.

Table for Ounces to Milligrams

Ounces conversion