An avoirdupois dram is 1/16 ounce.
Drams to Troy ounces Converter — dr to oz t
Convert Dram (dr) to Troy ounce (oz t) using the exact conversion factor (1 dram = 0.0569661458 troy ounce). See the formula, worked examples, and conversion table.
Drams to Troy ounces converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A troy ounce is exactly 31.1034768 grams.
Result = input x 0.001771845195 / 0.0311034768.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Drams to Troy ounces
Weight conversions between Dram and Troy ounce come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: An avoirdupois dram is 1/16 ounce, and a troy ounce is exactly 31.1034768 grams.
Formula
troy ounces = drams × 0.0569661458333
This factor comes from each unit's defined relationship to the category's base unit: 1 dram equals 0.00177184519531 base units, and 1 troy ounce equals 0.0311034768 base units, so dividing one by the other gives the direct dram-to-troy ounce factor of 0.0569661458333.
Simple example
1 dr × 0.05696614583 = 0.0569661458 oz t
1 dram = 0.0569661458 troy ounces.
Real-world example
50 dr × 0.05696614583 = 2.848307292 oz t
50 drams = 2.848307292 troy ounces.
Conversion table
| Dram (dr) | Troy ounce (oz t) |
|---|---|
| 1 dr | 0.0569661458 oz t |
| 5 dr | 0.2848307292 oz t |
| 10 dr | 0.5696614583 oz t |
| 25 dr | 1.424153646 oz t |
| 50 dr | 2.848307292 oz t |
| 100 dr | 5.696614583 oz t |
Reverse conversion: Troy ounce to Dram
0.0569661458 oz t × 17.55428571 = 0.9999999994 dr
0.0569661458 troy ounces = 0.9999999994 drams.
drams = troy ounces × 17.5542857143
For a page dedicated to this direction, see Troy ounce to Dram.
Understanding the Dram (dr)
An avoirdupois dram is 1/16 ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many troy ounces are in 1 dram?
1 dram equals 0.0569661458 troy ounces, using the exact defined conversion factor rather than an estimate.
How do I convert dram to troy ounce?
Multiply the dram value by 0.05696614583. The converter above does this instantly to whatever precision you set.
How do I convert troy ounce back to dram?
Use the reverse factor: 1 troy ounce equals 17.55428571 drams. You can also use the swap control in the converter above to flip the direction instantly.
What is a dram?
Dram (dr) is a unit of mass/weight.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
Is the dram to troy ounce conversion exact?
Yes. Both dram and troy ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.05696614583 used above is exact to as many digits as you choose to display.