# Troy Ounces to Drams (oz t to dr)

Source: https://www.unitconvertercalculator.com/weight/troy-ounces-to-drams/

**1 oz t = 17.554285714286 dr**

One troy ounce equals approximately 17.554 avoirdupois drams. This conversion bridges two pre-metric English weight systems: the troy system for precious metals and the avoirdupois system for everyday commerce. The non-round conversion factor reflects the fundamental incompatibility between these parallel English traditions.

## Formula

Apply the conversion factor

## Conversion Table

| Troy Ounces (oz t) | Drams (dr) |
|---|---|
| 0.1 oz t | 1.7554285714286 dr |
| 0.25 oz t | 4.3885714285714 dr |
| 0.5 oz t | 8.7771428571429 dr |
| 1 oz t | 17.554285714286 dr |
| 2 oz t | 35.108571428571 dr |
| 5 oz t | 87.771428571429 dr |
| 10 oz t | 175.54285714286 dr |
| 25 oz t | 438.85714285714 dr |
| 50 oz t | 877.71428571429 dr |
| 100 oz t | 1755.4285714286 dr |
| 250 oz t | 4388.5714285714 dr |
| 500 oz t | 8777.1428571429 dr |
| 1000 oz t | 17554.285714286 dr |

## Units

### Troy Ounce (oz t)

A troy ounce is a unit of mass used for precious metals such as gold, silver, and platinum. It equals exactly 31.1034768 grams, about 10% heavier than the common avoirdupois ounce.

### Dram (dr)

A dram (avoirdupois) is a unit of mass equal to 1/16 of an ounce or 1/256 of a pound (1.7718451953125 grams). Historically used in pharmacy and old cooking recipes.

## Background

Historical assay records occasionally required converting between troy ounce precious metal weights and avoirdupois dram measurements used for flux and reagent chemicals. This was a niche conversion in assaying workshops.

## Good to Know

The troy-ounce-to-dram conversion exposes the deepest structural division in English measurement: two parallel weight systems (troy and avoirdupois) that share a country, a language, and even some unit names, yet are fundamentally incompatible. The irrational factor of 17.554 is the mathematical scar of this historical divergence.

## FAQ

### How many avoirdupois drams are in one troy ounce?

One troy ounce equals approximately 17.554 avoirdupois drams. This is 31.1035 grams divided by 1.7718 grams per avoirdupois dram.

### Is this conversion used?

Rarely. It bridges two historical English weight systems that have both been largely superseded by the metric system for precise measurements.

### How do I convert troy ounces to drams?

Multiply troy ounces by 17.554. For example, 2 troy ounces equals about 35.1 avoirdupois drams.

## Non-Frequently Asked Questions

### Why is 17.554 such an ugly number?

Because the troy and avoirdupois systems were designed independently with different base units. The troy ounce (480 grains) and avoirdupois dram (27.344 grains) do not share clean factors, producing the irrational-looking conversion of 17.554. This is what happens when two measurement systems evolve separately in the same country.

### If I weighed a gold coin in drams, would a jeweler accept the result?

No reputable jeweler accepts precious metal weights in avoirdupois drams. Gold must be weighed in troy ounces, troy pennyweights, or grams. Presenting a gold coin weight in drams would mark you as either confused or deliberately trying to obscure the true weight. Neither impression helps in a negotiation.

### Are the troy ounce and dram the most mismatched imperial pairing?

They are strong contenders. Both are English, both measure weight, both use the word 'ounce' (the troy ounce and avoirdupois dram are both fractions of their respective ounces), yet they serve entirely different commercial domains. Their conversion demonstrates that sharing a language does not guarantee sharing a measurement vocabulary.

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## See Also

- [Drams to Troy Ounces](https://www.unitconvertercalculator.com/weight/drams-to-troy-ounces/)