Convert Ounce to Scruple (apothecary)
Convert ounces to scruples (apothecary) instantly. 1 ounce = 21.8749999807 scruple (apothecary) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Scruple (apothecary) to Ounce converter for the reverse conversion.
Units explained
Ounce
The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.
From Latin 'uncia', meaning a twelfth part.
US food portions, postal weights, and boxing weight classes.
Standardized as 1/16 of the international pound from 1959.
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.
Ounce to Scruple (apothecary) conversion formula
The relationship between ounces and scruples (apothecary):
To convert ounces to scruples (apothecary), multiply the value in ounces by 21.8749999807. To reverse, multiply scruples (apothecary) by 0.0457142858.
How to use this converter
Type a value into the calculator. The result in scruples (apothecary) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Scruple (apothecary) to Ounce converter for the reverse direction.
Step-by-step: convert ounces to scruples (apothecary)
- Write down the value in ounces (oz).
- Multiply that value by the factor 21.8749999807.
- The product is the equivalent value in scruples (apothecary) (s ap).
- To reverse, multiply the scruple (apothecary) value by 0.0457142858.
Worked examples
Example 1 — Convert 1 oz to s ap:
1 × 21.8749999807 = 21.8749999807 s ap
Example 2 — Convert 100 oz to s ap:
100 × 21.8749999807 = 2187.499998071 s ap
Real-world example — Postcard and small-object dimensions
A postcard is about 5 ounces wide. Converting to scruples (apothecary) is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 oz × 21.8749999807 = 109.3749999035 s ap
Real-world example — Ruler-scale measurements
A 30-ounce school ruler converts cleanly to scruples (apothecary) — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 oz × 21.8749999807 = 656.2499994213 s ap
Real-world example — Hardware-scale dimensions
A 10-ounce fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between ounces and scruples (apothecary) daily when mixing metric and imperial tools.
10 oz × 21.8749999807 = 218.7499998071 s ap
Ounce to Scruple (apothecary) conversion table
Standard reference values for converting ounces to scruples (apothecary):
| Ounce [oz] | Scruple (apothecary) [s ap] |
|---|---|
| 0.01 | 0.2187499998 |
| 0.1 | 2.1874999981 |
| 1 | 21.8749999807 |
| 2 | 43.7499999614 |
| 3 | 65.6249999421 |
| 4 | 87.4999999228 |
| 5 | 109.3749999035 |
| 10 | 218.7499998071 |
| 20 | 437.4999996142 |
| 30 | 656.2499994213 |
| 40 | 874.9999992284 |
| 50 | 1093.7499990355 |
| 100 | 2187.499998071 |
| 500 | 10937.4999903548 |
| 1000 | 21874.9999807095 |
Frequently asked questions
How many scruples (apothecary) is 1 ounce?
How do I convert ounces to scruples (apothecary)?
How do I convert scruples (apothecary) back to ounces?
How many scruples (apothecary) is 100 ounces?
Popular weight unit conversions
Convert Ounce to other weight units
Show all Ounce conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 oz = 21.8749999807 s ap) 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.