Convert Apothecary Ounces to Quarters
Convert Apothecary Ounces (oz ap) to Quarters (qr) instantly and accurately.
Conversion Formula
qr = oz ap × 0.002448979592
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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 Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
Quick Reference Table
| Apothecary Ounces (oz ap) | Quarters (qr) |
|---|---|
| 1 oz ap | 0.00244898 qr |
| 2 oz ap | 0.00489796 qr |
| 5 oz ap | 0.0122449 qr |
| 10 oz ap | 0.0244898 qr |
| 25 oz ap | 0.0612245 qr |
| 50 oz ap | 0.122449 qr |
| 100 oz ap | 0.244898 qr |