Convert Scruple (apothecary) to Pennyweight
Convert scruples (apothecary) to pennyweights instantly. 1 scruple (apothecary) = 0.8333333548 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight 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.
Pennyweight
The pennyweight (dwt) equals one-twentieth of a troy ounce, 24 grains (about 1.555 g).
From the mass of a medieval English silver penny; symbol dwt from 'denarius weight'.
Jewelry making and precious-metal scrap valuation in the US.
Derived from the medieval English coinage system.
Scruple (apothecary) to Pennyweight conversion formula
The relationship between scruples (apothecary) and pennyweights:
To convert scruples (apothecary) to pennyweights, multiply the value in scruples (apothecary) by 0.8333333548. To reverse, multiply pennyweights by 1.1999999691.
How to use this converter
Type a value into the calculator. The result in pennyweights updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Pennyweight to Scruple (apothecary) converter for the reverse direction.
Step-by-step: convert scruples (apothecary) to pennyweights
- Write down the value in scruples (apothecary) (s ap).
- Multiply that value by the factor 0.8333333548.
- The product is the equivalent value in pennyweights (dwt).
- To reverse, multiply the pennyweight value by 1.1999999691.
Worked examples
Example 1 — Convert 1 s ap to dwt:
1 × 0.8333333548 = 0.8333333548 dwt
Example 2 — Convert 100 s ap to dwt:
100 × 0.8333333548 = 83.3333354767 dwt
Real-world example — Postcard and small-object dimensions
A postcard is about 5 scruples (apothecary) wide. Converting to pennyweights is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 s ap × 0.8333333548 = 4.1666667738 dwt
Real-world example — Ruler-scale measurements
A 30-scruple (apothecary) school ruler converts cleanly to pennyweights — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 s ap × 0.8333333548 = 25.000000643 dwt
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 pennyweights daily when mixing metric and imperial tools.
10 s ap × 0.8333333548 = 8.3333335477 dwt
Scruple (apothecary) to Pennyweight conversion table
Standard reference values for converting scruples (apothecary) to pennyweights:
| Scruple (apothecary) [s ap] | Pennyweight [dwt] |
|---|---|
| 0.01 | 0.0083333335 |
| 0.1 | 0.0833333355 |
| 1 | 0.8333333548 |
| 2 | 1.6666667095 |
| 3 | 2.5000000643 |
| 4 | 3.3333334191 |
| 5 | 4.1666667738 |
| 10 | 8.3333335477 |
| 20 | 16.6666670953 |
| 30 | 25.000000643 |
| 40 | 33.3333341907 |
| 50 | 41.6666677384 |
| 100 | 83.3333354767 |
| 500 | 416.6666773836 |
| 1000 | 833.3333547672 |
Frequently asked questions
How many pennyweights is 1 scruple (apothecary)?
How do I convert scruples (apothecary) to pennyweights?
How do I convert pennyweights back to scruples (apothecary)?
How many pennyweights 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 = 0.8333333548 dwt) 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.