Convert Avoirdupois Drams to Apothecary Ounces
Convert Avoirdupois Drams (dr av) to Apothecary Ounces (oz ap) instantly and accurately.
Conversion Formula
oz ap = dr av × 0.05696614583
About Avoirdupois Drams
An avoirdupois dram (dr av) is 1/16 of an avoirdupois ounce - approximately 1.772 grams. Part of the avoirdupois system that governs everyday trade weights in the UK and US, it was historically used to measure small quantities of goods and spices in commerce. While rarely used in modern commerce (having been replaced by grams in most applications), the avoirdupois dram still appears in some spice and herbalist contexts, in US gunpowder loading data (where charges are specified in grains and drams), and in archaic recipe books.
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 Although the apothecary system has been replaced by SI units in modern medicine, the apothecary ounce still appears in historical pharmacopeias, traditional herbal medicine texts, and some compounding pharmacy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
| Avoirdupois Drams (dr av) | Apothecary Ounces (oz ap) |
|---|---|
| 1 dr av | 0.0569661 oz ap |
| 2 dr av | 0.113932 oz ap |
| 5 dr av | 0.284831 oz ap |
| 10 dr av | 0.569661 oz ap |
| 25 dr av | 1.42415 oz ap |
| 50 dr av | 2.84831 oz ap |
| 100 dr av | 5.69661 oz ap |