Convert Troy Ounces to Apothecary Ounces
Convert Troy Ounces (ozt) to Apothecary Ounces (oz ap) instantly and accurately.
Conversion Formula
oz ap = ozt × 1
About Troy Ounces
The troy ounce (ozt or oz t) is the global standard for weighing and pricing precious metals - gold, silver, platinum, and palladium. Equal to 31.1034768 grams (about 10% heavier than the avoirdupois ounce), it originates from the medieval fair at Troyes, France, where a standardised weight system facilitated international trade. All gold spot prices quoted on financial markets (LBMA, COMEX, MCX) are priced per troy ounce. A standard 'Good Delivery' gold bar approved by the London Bullion Market Association weighs approximately 400 troy ounces (12.4 kg).
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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.
Quick Reference Table
| Troy Ounces (ozt) | Apothecary Ounces (oz ap) |
|---|---|
| 1 ozt | 1 oz ap |
| 2 ozt | 2 oz ap |
| 5 ozt | 5 oz ap |
| 10 ozt | 10 oz ap |
| 25 ozt | 25 oz ap |
| 50 ozt | 50 oz ap |
| 100 ozt | 100 oz ap |