Milligrams to Ounces
Convert milligrams to ounces instantly — one milligram is 3.5274e-05 ounces.
| Milligrams | Ounces |
|---|---|
| 1 mg | 3.5274e-05 oz |
| 2 mg | 7.05479e-05 oz |
| 3 mg | 0.000106 oz |
| 5 mg | 0.000176 oz |
| 10 mg | 0.000353 oz |
| 25 mg | 0.000882 oz |
| 50 mg | 0.001764 oz |
| 100 mg | 0.003527 oz |
How to use
- Enter a value in the Milligrams field.
- The Ounces figure appears immediately — no button to press.
- Typing in the Ounces field converts back to Milligrams the same way.
- Use the reference table for the values that come up most often.
Milligrams to Ounces formula
Converting milligrams to ounces is a single multiplication by 3.52739619e-05.
oz = mg × 3.52739619e-05
Why this factor: the milligram and the ounce are both defined against the kilogram, so dividing one definition by the other gives 3.52739619e-05 directly. Both definitions are set out in full below.
To go the other way, divide by 3.52739619e-05 — or use the Ounces to Milligrams converter, which is the same calculation reversed.
Worked example
Given 150 mg, multiplying by 3.52739619e-05 yields 0.005291 oz.
150 mg × 3.52739619e-05 = 0.005291 oz
The converter above does this for any value you type, in either direction.
What is a milligram?
A milligram is one thousandth of a gram — the standard unit for drug doses and micronutrients.
Definition: Exactly 1×10⁻⁶ kilogram by SI prefix definition.
Where it is used: Medication dosages, vitamin and mineral content, and analytical chemistry.
What is an ounce?
An ounce is one sixteenth of a pound, used for small weights in the US.
Definition: Exactly 28.349523125 grams — one sixteenth of the international avoirdupois pound.
Where it is used: Food packaging, postal weights, and coffee and spice quantities in the US.
Worth knowing: Not the same as a fluid ounce, which measures volume. Also distinct from the troy ounce (31.103 g) used for gold and silver.
Milligrams vs Ounces
The milligram is a metric unit while the ounce is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many ounces are in a milligram?
One milligram equals 3.52739619e-05 ounces.
What is the formula to convert milligrams to ounces?
Multiply the number of milligrams by 3.52739619e-05. To reverse it, divide by 3.52739619e-05 instead.
How do I convert ounces back to milligrams?
Divide by 3.52739619e-05, which is the same as multiplying by 28349.5231.
How many ounces are in 10 milligrams?
10 mg works out to 0.000353 oz.
Is there anything to watch out for with ounces?
Not the same as a fluid ounce, which measures volume. Also distinct from the troy ounce (31.103 g) used for gold and silver.
How is the milligram defined?
Exactly 1×10⁻⁶ kilogram by SI prefix definition.