Convert Scruples to Micrograms
Convert Scruples (s ap) to Micrograms (µg) instantly and accurately.
Conversion Formula
µg = s ap × 1295978.2
About Scruples
A scruple (s ap) is a unit of the apothecary weight system equal to 20 grains or approximately 1.296 grams. Derived from the Latin 'scrupulus' (a small sharp stone used as a counterweight), it was the basic dispensing unit in pre-metric pharmacy across Europe. The apothecary system divided the fluid ounce into 8 drams, each dram into 3 scruples, and each scruple into 20 grains - a hierarchy memorised by every 19th-century pharmacist.
About Micrograms
A microgram (µg or mcg) is one millionth of a gram (10⁻⁶ g). It is the standard dosing unit for potent medications and micronutrients: vitamin B12 recommended daily intake is 2.4 µg, folic acid supplements are 400 µg, and levothyroxine (thyroid medication) doses are typically 25-200 µg. Air quality standards measure fine particulate matter (PM2.5) in micrograms per cubic meter - the WHO guideline is 15 µg/m³ annual mean. A grain of sand weighs about 50-100 micrograms, and a single snowflake approximately 3 micrograms.
Quick Reference Table
| Scruples (s ap) | Micrograms (µg) |
|---|---|
| 1 s ap | 1295980 µg |
| 2 s ap | 2591960 µg |
| 5 s ap | 6479890 µg |
| 10 s ap | 12959800 µg |
| 25 s ap | 32399500 µg |
| 50 s ap | 64798900 µg |
| 100 s ap | 129598000 µg |