An avoirdupois dram is 1/16 ounce.
Drams to Stones Converter — dr to st
Convert Dram (dr) to Stone (st) using the exact conversion factor (1 dram = 0.0002790179 stone). See the formula, worked examples, conversion table, history, and common uses.
Drams to Stones 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 stone is 14 pounds.
Result = input x 0.001771845195 / 6.35029318.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Drams to Stones
Weight conversions between Dram and Stone 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 stone is 14 pounds.
Formula
stones = drams × 0.000279017857143
This factor comes from each unit's defined relationship to the category's base unit: 1 dram equals 0.00177184519531 base units, and 1 stone equals 6.35029318 base units, so dividing one by the other gives the direct dram-to-stone factor of 0.000279017857143.
Simple example
1 dr × 0.0002790178571 = 0.0002790179 st
1 dram = 0.0002790179 stones.
Real-world example
50 dr × 0.0002790178571 = 0.0139508929 st
50 drams = 0.0139508929 stones.
Conversion table
| Dram (dr) | Stone (st) |
|---|---|
| 1 dr | 0.0002790179 st |
| 5 dr | 0.0013950893 st |
| 10 dr | 0.0027901786 st |
| 25 dr | 0.0069754464 st |
| 50 dr | 0.0139508929 st |
| 100 dr | 0.0279017857 st |
Reverse conversion: Stone to Dram
0.0002790179 st × 3584 = 1.000000154 dr
0.0002790179 stones = 1.000000154 drams.
drams = stones × 3584
For a page dedicated to this direction, see Stone to Dram.
Understanding the Dram (dr)
An avoirdupois dram is 1/16 ounce.
Understanding the Stone
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
Where it's used: United Kingdom and Ireland (body weight)
Uses of the Stone today
- Body weight reporting in the UK and Ireland (e.g. '12 stone 5 pounds')
- Historical wool and agricultural produce weighing
History of the Stone
The stone dates to medieval England as a general-purpose weight unit, historically varying by region and commodity (a 'stone' of wool differed from a 'stone' of meat) before settling on 14 pounds for general use. It remains in everyday use for body weight in the UK and Ireland, unlike most other English customary units which have been replaced or supplemented by metric measures.
Historical origin. Stone was not the invention of a single named person; it developed through the process described above.
Stone — sources
- UK Weights and Measures Act 1985 — Confirms the stone (14 lb) as a legally recognized UK unit for body weight.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones are in 1 dram?
1 dram equals 0.0002790179 stones, using the exact defined conversion factor rather than an estimate.
How do I convert dram to stone?
Multiply the dram value by 0.0002790178571. The converter above does this instantly to whatever precision you set.
How do I convert stone back to dram?
Use the reverse factor: 1 stone equals 3,584 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 stone?
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
Is the dram to stone conversion exact?
Yes. A stone is 14 pounds: exactly 6.35029318 kilograms. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.