How many micrograms are in one ounce?

One avoirdupois ounce equals exactly 28,349,523.125 micrograms (µg). This follows from 1 oz = 28.349523125 grams and 1 gram = 1,000,000 µg.

Which ounce does this converter use?

This tool uses the avoirdupois ounce (oz), the standard unit for everyday and commercial weight in the United States. It does NOT use the troy ounce (ozt), which is heavier at 31,103,476.8 µg.

Why would I need to convert micrograms to ounces?

Micrograms are common in medicine, pharmacology, and nutrition for measuring vitamins (e.g. Vitamin D, B12) and drug doses. Converting to ounces can help contextualize these tiny amounts in familiar imperial terms or for US regulatory filings.

How accurate is the conversion?

The conversion factor 28,349,523.125 µg/oz is exact by definition under the international avoirdupois system. This tool computes results in full floating-point precision and displays up to 10 significant figures.

Can I convert ounces back to micrograms?

Yes. Toggle the reverse switch on the converter to enter ounces and get micrograms. The formula simply multiplies by 28,349,523.125 instead of dividing.

Micrograms to Ounces Converter

Enter a microgram value and instantly get the equivalent in ounces (avoirdupois).

Enter Value

Micrograms (µg) Ounces (oz)

µg

Result

Ounces (oz)

—

Formula Used

oz = µg ÷ 28,349,523.125

Quick Reference

Micrograms (µg)	Ounces (oz)
1	3.5274e-8
1,000	3.5274e-5
1,000,000	0.035274
28,349,523	~1
1,000,000,000	35.274

Summary

This converter transforms mass values from micrograms (µg) to ounces (oz) using the exact conversion factor of 1 oz = 28,349,523.125 µg. It is useful for scientific, pharmaceutical, and nutritional contexts where tiny masses must be expressed in more familiar imperial units. Results are displayed with up to 10 significant figures to preserve accuracy for very small values.

How it works

Enter the microgram value you want to convert.
The converter divides your input by 28,349,523.125 (the number of micrograms in one ounce).
The result in ounces is displayed instantly along with the full formula.
Use the Copy button to copy the result to your clipboard.
Switch to reverse mode to convert ounces back to micrograms.

Use cases

Convert pharmaceutical or supplement dosages from µg to oz for labeling.
Translate lab measurements into imperial units for US-based reporting.
Check nutritional micro-nutrient amounts listed in µg against ounce-based serving sizes.
Verify tiny mass readings from analytical balances in a familiar unit.
Educational use: understand the scale relationship between metric and imperial mass units.

Frequently Asked Questions

Last updated: 2026-06-04 · Reviewed by Nham Vu