Convert Stones to Apothecary Ounces
Convert Stones (st) to Apothecary Ounces (oz ap) instantly and accurately.
Conversion Formula
oz ap = st × 204.1666667
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.
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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
| Stones (st) | Apothecary Ounces (oz ap) |
|---|---|
| 1 st | 204.167 oz ap |
| 2 st | 408.333 oz ap |
| 5 st | 1020.83 oz ap |
| 10 st | 2041.67 oz ap |
| 25 st | 5104.17 oz ap |
| 50 st | 10208.3 oz ap |
| 100 st | 20416.7 oz ap |