Convert Milligram to Ounce (mg → oz)

Converting milligrams to ounces is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in milligrams

   Start with the number of milligrams (mg) you want to convert.
2. 2
   Multiply by 0.00003527

   The conversion factor from mg to oz is 0.00003527. Multiply your value by this number.
3. 3
   Read the result in ounces

   The result is your value in ounces (oz).

Multiply the value in milligrams by 0.00003527. For the reverse direction, multiply by 28,349.523.

• ✓1 mg = 1/1000 g = 1,000,000 µg. Always check which prefix the label uses.
• ✓Read medication labels carefully — confusing mg and µg can be a 1000× dosing error.
• ✓Nutrition labels list minerals in mg and vitamins (A, D, K) in µg.

• ✗Reading 500 mg as 500 g on a medicine bottle — a potentially fatal 1000× error.
• ✗Confusing mg (milligram) with mg/kg (dose per kilogram of body weight).
• ✗Mixing up mg and µg — µg is 1000× smaller.

What is the Milligram?

The milligram equals one thousandth of a gram (0.001 g) or 10⁻⁶ kilograms, and is the standard unit for pharmaceutical dosing, vitamin labeling, food additives, and chemistry laboratory work. A typical aspirin tablet contains 325–500 mg of active ingredient, and recommended daily vitamin C intake is around 75–90 mg. The milligram is essential in toxicology (LD50 values are often given in mg per kg of body weight), water-quality testing (dissolved minerals in mg/L), and trace-element analysis. It relates to the gram (1,000 mg = 1 g), the microgram (1,000 µg = 1 mg), and the grain (1 grain ≈ 64.8 mg). Pharmaceutical prescriptions worldwide rely on milligrams, and accurate sub-milligram balances are standard in research and pharmacy environments.

• Prescription and over-the-counter drug dosing
• Vitamin and mineral supplement labelling
• Trace element analysis in laboratories

What is the Ounce?

The ounce equals exactly 28.349523125 grams or 1/16 of a pound. The word derives from the Latin 'uncia,' meaning one twelfth (the original Roman ounce was 1/12 of a Roman pound). The modern avoirdupois ounce, used for everyday weights in the United States and the United Kingdom, replaced the older Tower and Troy systems. It is the standard unit for American kitchen recipes (where 'ounce' refers to weight, distinct from the fluid ounce of volume), postal rates, package sizes (a 12-oz can of soda), and boxing-glove weights. Precious metals like gold and silver use the troy ounce (31.103 g), about 10% heavier than the avoirdupois ounce. The ounce relates to the pound (16 oz = 1 lb), the gram (1 oz ≈ 28.35 g), and the grain (1 oz = 437.5 grains).

• American and British cooking recipes
• Food packaging in the US
• Precious metals (troy ounce = 31.10 g, different from avoirdupois)