Ounces to Micrograms
Type a value in either box to convert between ounces and micrograms. The factor is 2.83495e+07.
| Ounces | Micrograms |
|---|---|
| 1 oz | 28349523.125 µg |
| 2 oz | 56699046.25 µg |
| 3 oz | 85048569.375 µg |
| 5 oz | 141747615.625 µg |
| 10 oz | 283495231.25 µg |
| 25 oz | 708738078.125 µg |
| 50 oz | 1417476156.25 µg |
| 100 oz | 2834952312.5 µg |
How to use
- Enter a value in the Ounces field.
- The Micrograms figure appears immediately — no button to press.
- Typing in the Micrograms field converts back to Ounces the same way.
- Use the reference table for the values that come up most often.
Ounces to Micrograms formula
The factor from ounces to micrograms is 28349523.1.
µg = oz × 28349523.1
Why this factor: the ounce and the microgram are both defined against the kilogram, so dividing one definition by the other gives 28349523.1 directly. Both definitions are set out in full below.
To go the other way, divide by 28349523.1 — or use the Micrograms to Ounces converter, which is the same calculation reversed.
Worked example
Take 150 oz and multiply by the factor 28349523.1: the result is 4252428468.75 µg.
150 oz × 28349523.1 = 4252428468.75 µg
The converter above does this for any value you type, in either direction.
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.
What is a microgram?
A microgram is one millionth of a gram, used where quantities are vanishingly small but still matter.
Definition: Exactly 1×10⁻⁹ kilogram by SI prefix definition. Symbol µg.
Where it is used: Trace nutrients such as vitamin B12 and folate, hormone doses, and air-quality measurements.
Worth knowing: Sometimes abbreviated 'mcg' on labels specifically to avoid µg being misread as mg — a thousandfold dosing error.
Ounces vs Micrograms
The ounce is an imperial unit while the microgram is a metric 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 micrograms are in an ounce?
One ounce equals 28349523.1 micrograms.
What is the formula to convert ounces to micrograms?
Multiply the number of ounces by 28349523.1. To reverse it, divide by 28349523.1 instead.
How do I convert micrograms back to ounces?
Divide by 28349523.1, which is the same as multiplying by 3.52739619e-08.
How many micrograms are in 10 ounces?
10 oz works out to 283495231.25 µg.
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 ounce defined?
Exactly 28.349523125 grams — one sixteenth of the international avoirdupois pound.