How to convert ounces to milligrams
To convert a measurement in ounces to milligrams, multiply the value by 28,349.5231. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 oz to milligrams: 5 × 28,349.5231 = 141,747.6156 mg.
What is a ounce?
An ounce is an imperial and US customary unit of mass equal to 1/16 of a pound or exactly 28.349523125 grams. The avoirdupois ounce descends from the Roman 'uncia' (one twelfth). It is distinct from the troy ounce used for precious metals, which is heavier at about 31.1 grams.
Common uses of ounces include: Food portions and recipe ingredients in the US; Postal and letter weights; Packaged goods net weight (cereal, snacks); Baby birth weights in the US.
What is a milligram?
A milligram is a metric unit of mass equal to one thousandth of a gram (0.001 g) or one millionth of a kilogram. Part of the original metric system, the milligram derives from the Latin 'mille' (thousand). It became indispensable in pharmacy and medicine, where drug doses are almost always expressed in milligrams.
Common uses of milligrams include: Medication and supplement dosages; Nutrient amounts on nutrition labels (sodium, vitamins); Laboratory chemistry and analytical work; Gunpowder and reloading measurements.
Ounces to milligrams worked examples
Here are some common values converted:
1 oz = 28,349.5231 mg 5 oz = 141,747.6156 mg 10 oz = 283,495.2313 mg 50 oz = 1,417,476.1563 mg 100 oz = 2,834,952.3125 mg
Frequently asked questions
How many milligrams are in one ounce?
One ounce (oz) equals 28,349.5231 milligrams (mg). Multiply any value in ounces by 28,349.5231 to convert to milligrams.
How do I convert ounces to milligrams?
Multiply the value in ounces by 28,349.5231. For example, 5 oz × 28,349.5231 = 141,747.6156 mg.
How do I convert milligrams to ounces?
Multiply the value in milligrams by 0.000035273962, or divide by 28,349.5231. Use the swap button on the converter above to reverse the direction.
Is the ounce to milligram conversion exact?
Yes. Since 1959 the international pound is defined as exactly 0.45359237 kg, so all weight conversions between metric and avoirdupois units use exact factors.
What is the formula for ounces to milligrams?
The formula is: mg = oz × 28,349.5231. This comes from the definition of both units relative to the kilogram.