Convert Apothecary Ounces to Pounds
Convert Apothecary Ounces (oz ap) to Pounds (lb) instantly and accurately.
Conversion Formula
lb = oz ap × 0.06857142857
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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 Pounds
The avoirdupois pound (lb) is the primary unit of weight in the United States and United Kingdom for everyday use, equal to 16 ounces or exactly 453.59237 grams. It dominates American life: body weight, grocery produce, deli counter cuts, freight shipping costs, gym weights, and building material quantities are all measured in pounds and ounces. American recipes use pounds for meat and large quantities. The pound derives from the Roman 'libra pondo' (a pound by weight) - hence both the symbol 'lb' (from libra) and the British currency symbol '£'.
Quick Reference Table
| Apothecary Ounces (oz ap) | Pounds (lb) |
|---|---|
| 1 oz ap | 0.0685714 lb |
| 2 oz ap | 0.137143 lb |
| 5 oz ap | 0.342857 lb |
| 10 oz ap | 0.685714 lb |
| 25 oz ap | 1.71429 lb |
| 50 oz ap | 3.42857 lb |
| 100 oz ap | 6.85714 lb |