Convert Scruple (apothecary) to Ounce
Convert scruples (apothecary) to ounces instantly. 1 scruple (apothecary) = 0.0457142858 ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ounce 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.
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) to Ounce conversion formula
The relationship between scruples (apothecary) and ounces:
To convert scruples (apothecary) to ounces, multiply the value in scruples (apothecary) by 0.0457142858. To reverse, multiply ounces by 21.8749999807.
How to use this converter
Type a value into the calculator. The result in ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ounce to Scruple (apothecary) converter for the reverse direction.
Step-by-step: convert scruples (apothecary) to ounces
- Write down the value in scruples (apothecary) (s ap).
- Multiply that value by the factor 0.0457142858.
- The product is the equivalent value in ounces (oz).
- To reverse, multiply the ounce value by 21.8749999807.
Worked examples
Example 1 — Convert 1 s ap to oz:
1 × 0.0457142858 = 0.0457142858 oz
Example 2 — Convert 100 s ap to oz:
100 × 0.0457142858 = 4.5714285755 oz
Real-world example — Postcard and small-object dimensions
A postcard is about 5 scruples (apothecary) wide. Converting to ounces is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 s ap × 0.0457142858 = 0.2285714288 oz
Real-world example — Ruler-scale measurements
A 30-scruple (apothecary) school ruler converts cleanly to ounces — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 s ap × 0.0457142858 = 1.3714285726 oz
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 ounces daily when mixing metric and imperial tools.
10 s ap × 0.0457142858 = 0.4571428575 oz
Scruple (apothecary) to Ounce conversion table
Standard reference values for converting scruples (apothecary) to ounces:
| Scruple (apothecary) [s ap] | Ounce [oz] |
|---|---|
| 0.01 | 0.0004571429 |
| 0.1 | 0.0045714286 |
| 1 | 0.0457142858 |
| 2 | 0.0914285715 |
| 3 | 0.1371428573 |
| 4 | 0.182857143 |
| 5 | 0.2285714288 |
| 10 | 0.4571428575 |
| 20 | 0.9142857151 |
| 30 | 1.3714285726 |
| 40 | 1.8285714302 |
| 50 | 2.2857142877 |
| 100 | 4.5714285755 |
| 500 | 22.8571428773 |
| 1000 | 45.7142857546 |
Frequently asked questions
How many ounces is 1 scruple (apothecary)?
How do I convert scruples (apothecary) to ounces?
How do I convert ounces back to scruples (apothecary)?
How many ounces 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 = 0.0457142858 oz) 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.