Convert Apothecary Ounces to Troy Pounds
Convert Apothecary Ounces (oz ap) to Troy Pounds (lb t) instantly and accurately.
Conversion Formula
lb t = oz ap × 0.08333333333
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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 Troy Pounds
A troy pound (lb t) equals 12 troy ounces or 5,760 grains - approximately 373.24 grams. It is lighter than the common avoirdupois pound (453.59 g) because the troy system divides the pound into 12 ounces rather than 16. Historically used across Europe for trade in precious metals and pharmaceuticals, the troy pound was the legal standard in England from the 15th century until 1878. In the United States, the troy pound was once the official standard for coinage but was abolished for commercial use in 1828.
Quick Reference Table
| Apothecary Ounces (oz ap) | Troy Pounds (lb t) |
|---|---|
| 1 oz ap | 0.0833333 lb t |
| 2 oz ap | 0.166667 lb t |
| 5 oz ap | 0.416667 lb t |
| 10 oz ap | 0.833333 lb t |
| 25 oz ap | 2.08333 lb t |
| 50 oz ap | 4.16667 lb t |
| 100 oz ap | 8.33333 lb t |