Convert Apothecary Ounces to Stones
Convert Apothecary Ounces (oz ap) to Stones (st) instantly and accurately.
Conversion Formula
st = oz ap × 0.004897959184
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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 Stones
A stone (st) equals 14 pounds or approximately 6.350 kg. It is the standard unit for expressing human body weight in the United Kingdom and Ireland, where a person will say they weigh '11 stone 4' (meaning 11 stone and 4 pounds, or 158 lb / 71.7 kg). Despite the UK's official adoption of the metric system, stones remain the dominant unit for personal body weight on British bathroom scales, in doctors' offices, and in everyday conversation. British newspapers and sports reports routinely describe athletes' weights in stones and pounds.
Quick Reference Table
| Apothecary Ounces (oz ap) | Stones (st) |
|---|---|
| 1 oz ap | 0.00489796 st |
| 2 oz ap | 0.00979592 st |
| 5 oz ap | 0.0244898 st |
| 10 oz ap | 0.0489796 st |
| 25 oz ap | 0.122449 st |
| 50 oz ap | 0.244898 st |
| 100 oz ap | 0.489796 st |