Convert Apothecary Ounces to Micrograms
Convert Apothecary Ounces (oz ap) to Micrograms (µg) instantly and accurately.
Conversion Formula
µg = oz ap × 31103476.8
About Apothecary Ounces
An apothecary ounce (oz ap) is identical in mass to the troy ounce - approximately 31.10 grams - and equals 8 apothecary drams or 480 grains. It was the standard ounce used by pharmacists and physicians across Europe and North America from medieval times until the 20th century. Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy references.
About Micrograms
A microgram (µg or mcg) is one millionth of a gram (10⁻⁶ g). It is the standard dosing unit for potent medications and micronutrients: vitamin B12 recommended daily intake is 2.4 µg, folic acid supplements are 400 µg, and levothyroxine (thyroid medication) doses are typically 25-200 µg. Air quality standards measure fine particulate matter (PM2.5) in micrograms per cubic meter - the WHO guideline is 15 µg/m³ annual mean. A grain of sand weighs about 50-100 micrograms, and a single snowflake approximately 3 micrograms.
Quick Reference Table
| Apothecary Ounces (oz ap) | Micrograms (µg) |
|---|---|
| 1 oz ap | 31103500 µg |
| 2 oz ap | 62207000 µg |
| 5 oz ap | 155517000 µg |
| 10 oz ap | 311035000 µg |
| 25 oz ap | 777587000 µg |
| 50 oz ap | 1.555 × 109 µg |
| 100 oz ap | 3.11 × 109 µg |