Convert Troy Ounces to Avoirdupois Drams
Convert Troy Ounces (ozt) to Avoirdupois Drams (dr av) instantly and accurately.
Conversion Formula
dr av = ozt × 17.55428571
About Troy Ounces
The troy ounce (ozt or oz t) is the global standard for weighing and pricing precious metals - gold, silver, platinum, and palladium. Equal to 31.1034768 grams (about 10% heavier than the avoirdupois ounce), it originates from the medieval fair at Troyes, France, where a standardised weight system facilitated international trade. All gold spot prices quoted on financial markets (LBMA, COMEX, MCX) are priced per troy ounce. A standard 'Good Delivery' gold bar approved by the London Bullion Market Association weighs approximately 400 troy ounces (12.4 kg).
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 While rarely used in modern commerce (having been replaced by grams in most applications), the avoirdupois dram still appears in some spice and herbalist contexts, in US gunpowder loading data (where charges are specified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.
Quick Reference Table
| Troy Ounces (ozt) | Avoirdupois Drams (dr av) |
|---|---|
| 1 ozt | 17.5543 dr av |
| 2 ozt | 35.1086 dr av |
| 5 ozt | 87.7714 dr av |
| 10 ozt | 175.543 dr av |
| 25 ozt | 438.857 dr av |
| 50 ozt | 877.714 dr av |
| 100 ozt | 1755.43 dr av |