Convert Scruples to Kilograms
Convert Scruples (s ap) to Kilograms (kg) instantly and accurately.
Conversion Formula
kg = s ap × 0.0012959782
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 Kilograms
The kilogram (kg) is the SI base unit of mass - the fundamental unit from which all other mass measurements in the metric system are derived. Since 2019 it has been defined by fixing the Planck constant h to exactly 6.62607015 × 10⁻³⁴ J·s, replacing the 130-year-old International Prototype Kilogram (a platinum-iridium cylinder kept in Sèvres, France). The kilogram governs daily life worldwide: body weight in most countries, grocery shopping, luggage allowances, postal rates, freight pricing, and ingredient quantities in cooking all reference kilograms.
Quick Reference Table
| Scruples (s ap) | Kilograms (kg) |
|---|---|
| 1 s ap | 0.00129598 kg |
| 2 s ap | 0.00259196 kg |
| 5 s ap | 0.00647989 kg |
| 10 s ap | 0.0129598 kg |
| 25 s ap | 0.0323995 kg |
| 50 s ap | 0.0647989 kg |
| 100 s ap | 0.129598 kg |