Convert Quarters to Slugs
Convert Quarters (qr) to Slugs (slug) instantly and accurately.
Conversion Formula
slug = qr × 0.8702666048
About Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
About Slugs
A slug is a unit of mass in the British imperial and US customary foot-pound-second (FPS) engineering system, equal to the mass that accelerates at 1 foot per second squared under a force of 1 pound-force - approximately 14.594 kg. The slug was introduced to simplify dynamics calculations in engineering: using slugs ensures that F = ma holds without unit conversion factors when force is in pounds-force and acceleration in ft/s². Aerospace engineers and mechanical engineers working in US customary units use slugs for aircraft mass, structural dynamics, and ballistic calculations.
Quick Reference Table
| Quarters (qr) | Slugs (slug) |
|---|---|
| 1 qr | 0.870267 slug |
| 2 qr | 1.74053 slug |
| 5 qr | 4.35133 slug |
| 10 qr | 8.70267 slug |
| 25 qr | 21.7567 slug |
| 50 qr | 43.5133 slug |
| 100 qr | 87.0267 slug |