Convert Ounces to Milligrams
Convert Ounces to Milligrams instantly. 1 Ounce (oz) equals 28,349.52 Milligrams (mg).
Ounces to Milligrams conversion table
| Ounces (oz) | Milligrams (mg) |
|---|---|
| 1 oz | 28,349.52 mg |
| 2 oz | 56,699.05 mg |
| 3 oz | 85,048.57 mg |
| 5 oz | 141,747.62 mg |
| 10 oz | 283,495.23 mg |
| 20 oz | 566,990.46 mg |
| 50 oz | 1,417,476.16 mg |
| 100 oz | 2,834,952.31 mg |
| 500 oz | 14,174,761.56 mg |
| 1,000 oz | 28,349,523.13 mg |
1 Ounce = 28,349.52 Milligrams · multiply Ounces by 28,349.52
About converting Ounces to Milligrams
Ounces (oz) and Milligrams (mg) are both units of weight & mass, so converting between them is a single multiplication: multiply your Ounces figure by 28,349.52. Ten Ounces comes to 283,495.23 Milligrams, and a hundred works out at 2,834,952.31 Milligrams.
Rule of thumb: going from Ounces to Milligrams multiplies, so the figure always grows — one Ounce is already 28,349.52 Milligrams. If your answer came out smaller, you have the conversion the wrong way round.
What is an Ounce?
The ounce here is the avoirdupois ounce, one sixteenth of a pound, and the qualifier matters. The troy ounce used to price gold and silver is noticeably heavier, so a "one ounce" gold coin is not an ounce of anything else — a confusion that has cost people real money. Muddier still is the fluid ounce, which measures volume rather than mass and differs between the US and the UK. The name comes from the Latin uncia, a twelfth part: it was a twelfth of the Roman libra, and the move to sixteen ounces to the pound came later.
What is a Milligram?
A milligram is one thousandth of a gram, and it marks the point where measurement stops being about objects and starts being about doses and traces. Nutrition labels give sodium, cholesterol and most vitamins in milligrams; pharmacies dispense tablets by them; environmental limits on lead or arsenic are written in milligrams per litre. Milligrams sit well below the resolution of any kitchen or shop scale — reading them takes a laboratory balance — which is why the unit belongs to pharmacists, chemists and regulators rather than to everyday life.
To put both in perspective: a slice of sandwich bread weighs about an ounce, while a grain of rice weighs roughly 25 milligrams.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Milligrams to Ounces converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Milligrams are in one Ounce?
There are 28,349.52 Milligrams in one Ounce.
How do I convert Ounces to Milligrams?
Multiply the number of Ounces by 28,349.52. For example, 10 Ounces = 283,495.23 Milligrams.
What is 100 Ounces in Milligrams?
100 Ounces is equal to 2,834,952.31 Milligrams.
How do I convert Milligrams to Ounces?
Multiply the Milligrams value by 0.00003527 (or divide by 28,349.52).
Is this Ounces to Milligrams conversion exact?
The definition is exact — Ounces and Milligrams are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is an Ounce?
The ounce here is the avoirdupois ounce, one sixteenth of a pound, and the qualifier matters. The troy ounce used to price gold and silver is noticeably heavier, so a "one ounce" gold coin is not an ounce of anything else — a confusion that has cost people real money. Muddier still is the fluid ounce, which measures volume rather than mass and differs between the US and the UK. The name comes from the Latin uncia, a twelfth part: it was a twelfth of the Roman libra, and the move to sixteen ounces to the pound came later.
What is a Milligram?
A milligram is one thousandth of a gram, and it marks the point where measurement stops being about objects and starts being about doses and traces. Nutrition labels give sodium, cholesterol and most vitamins in milligrams; pharmacies dispense tablets by them; environmental limits on lead or arsenic are written in milligrams per litre. Milligrams sit well below the resolution of any kitchen or shop scale — reading them takes a laboratory balance — which is why the unit belongs to pharmacists, chemists and regulators rather than to everyday life.