Convert Microgram to Scruple (apothecary)
Convert micrograms to scruples (apothecary) instantly. 1 microgram = 7.716179e-7 scruple (apothecary) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Scruple (apothecary) to Microgram converter for the reverse conversion.
Units explained
Microgram
A microgram (ug) equals 10^-9 kilogram, or one-millionth of a gram.
From the SI prefix 'micro-' (from Greek 'mikros', small).
Trace nutrients, potent drug doses, and environmental contaminant levels.
The micro- prefix was incorporated into the SI in 1960.
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.
Microgram to Scruple (apothecary) conversion formula
The relationship between micrograms and scruples (apothecary):
To convert micrograms to scruples (apothecary), multiply the value in micrograms by 7.716179e-7. To reverse, multiply scruples (apothecary) by 1295978.2.
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 Microgram converter for the reverse direction.
Step-by-step: convert micrograms to scruples (apothecary)
- Write down the value in micrograms (µg).
- Multiply that value by the factor 7.716179e-7.
- The product is the equivalent value in scruples (apothecary) (s ap).
- To reverse, multiply the scruple (apothecary) value by 1295978.2.
Worked examples
Example 1 — Convert 1 µg to s ap:
1 × 7.716179e-7 = 7.716179e-7 s ap
Example 2 — Convert 100 µg to s ap:
100 × 7.716179e-7 = 7.716179e-5 s ap
Real-world example — Sub-micron to millimeter
500,000 micrograms converts to a small everyday quantity in scruples (apothecary) — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 µg × 7.716179e-7 = 0.3858089588 s ap
Real-world example — From wavelengths to millimeter-scale objects
A value of one million micrograms sounds vast at the atomic scale but converts to a small everyday quantity in scruples (apothecary) — useful when relating optical-wavelength specifications to physical mounting hardware.
1000000 µg × 7.716179e-7 = 0.7716179176 s ap
Microgram to Scruple (apothecary) conversion table
Standard reference values for converting micrograms to scruples (apothecary):
| Microgram [µg] | Scruple (apothecary) [s ap] |
|---|---|
| 0.01 | 7.716179e-9 |
| 0.1 | 7.716179e-8 |
| 1 | 7.716179e-7 |
| 2 | 1.543236e-6 |
| 3 | 2.314854e-6 |
| 4 | 3.086472e-6 |
| 5 | 3.85809e-6 |
| 10 | 7.716179e-6 |
| 20 | 1.543236e-5 |
| 30 | 2.314854e-5 |
| 40 | 3.086472e-5 |
| 50 | 3.85809e-5 |
| 100 | 7.716179e-5 |
| 500 | 0.000385809 |
| 1000 | 0.0007716179 |
Frequently asked questions
How many scruples (apothecary) is 1 microgram?
How do I convert micrograms to scruples (apothecary)?
How do I convert scruples (apothecary) back to micrograms?
How many scruples (apothecary) is 100 micrograms?
Popular weight unit conversions
Convert Microgram to other weight units
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Metric / SI (17 units)
Avoirdupois (15 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 µg = 7.716179e-7 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.