Convert Scruple (apothecary) to Dram (avoirdupois)
Convert scruples (apothecary) to drams (avoirdupois) instantly. 1 scruple (apothecary) = 0.7314285695 dram (avoirdupois) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (avoirdupois) to Scruple (apothecary) converter for the reverse conversion.
Units explained
Scruple (apothecary)
The apothecary scruple equals 20 grains, about 1.296 grams.
From Latin 'scrupulus', a small sharp pebble used as a tiny weight.
Historical apothecary dosing of powders.
Part of the apothecaries' system used through the 19th century.
Dram (avoirdupois)
The avoirdupois dram (dr) equals one-sixteenth of an ounce, about 1.77 grams.
From Greek 'drachma' through Latin 'dragma'.
Historically pharmacy; today occasional cooking and firearms (powder) use.
Defined as 1/256 of the avoirdupois pound.
Scruple (apothecary) to Dram (avoirdupois) conversion formula
The relationship between scruples (apothecary) and drams (avoirdupois):
To convert scruples (apothecary) to drams (avoirdupois), multiply the value in scruples (apothecary) by 0.7314285695. To reverse, multiply drams (avoirdupois) by 1.3671875036.
How to use this converter
Type a value into the calculator. The result in drams (avoirdupois) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dram (avoirdupois) to Scruple (apothecary) converter for the reverse direction.
Step-by-step: convert scruples (apothecary) to drams (avoirdupois)
- Write down the value in scruples (apothecary) (s ap).
- Multiply that value by the factor 0.7314285695.
- The product is the equivalent value in drams (avoirdupois) (dr).
- To reverse, multiply the dram (avoirdupois) value by 1.3671875036.
Worked examples
Example 1 — Convert 1 s ap to dr:
1 × 0.7314285695 = 0.7314285695 dr
Example 2 — Convert 100 s ap to dr:
100 × 0.7314285695 = 73.1428569494 dr
Real-world example — Ruler-scale measurements
A 30-scruple (apothecary) school ruler converts cleanly to drams (avoirdupois) — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 s ap × 0.7314285695 = 21.9428570848 dr
Real-world example — Hardware-scale dimensions
A 10-scruple (apothecary) fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between scruples (apothecary) and drams (avoirdupois) daily when mixing metric and imperial tools.
10 s ap × 0.7314285695 = 7.3142856949 dr
Real-world example — Postcard and small-object dimensions
A postcard is about 5 scruples (apothecary) wide. Converting to drams (avoirdupois) is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 s ap × 0.7314285695 = 3.6571428475 dr
Scruple (apothecary) to Dram (avoirdupois) conversion table
Standard reference values for converting scruples (apothecary) to drams (avoirdupois):
| Scruple (apothecary) [s ap] | Dram (avoirdupois) [dr] |
|---|---|
| 0.01 | 0.0073142857 |
| 0.1 | 0.0731428569 |
| 1 | 0.7314285695 |
| 2 | 1.462857139 |
| 3 | 2.1942857085 |
| 4 | 2.925714278 |
| 5 | 3.6571428475 |
| 10 | 7.3142856949 |
| 20 | 14.6285713899 |
| 30 | 21.9428570848 |
| 40 | 29.2571427797 |
| 50 | 36.5714284747 |
| 100 | 73.1428569494 |
| 500 | 365.7142847468 |
| 1000 | 731.4285694935 |
Frequently asked questions
How many drams (avoirdupois) is 1 scruple (apothecary)?
How do I convert scruples (apothecary) to drams (avoirdupois)?
How do I convert drams (avoirdupois) back to scruples (apothecary)?
How many drams (avoirdupois) is 100 scruples (apothecary)?
Popular weight unit conversions
Convert Scruple (apothecary) to other weight units
Show all Scruple (apothecary) conversions
Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (9 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 s ap = 0.7314285695 dr) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.