Convert Pounds to Slugs
Convert Pounds (lb) to Slugs (slug) instantly and accurately.
Conversion Formula
slug = lb × 0.03108095017
About Pounds
The avoirdupois pound (lb) is the primary unit of weight in the United States and United Kingdom for everyday use, equal to 16 ounces or exactly 453.59237 grams. It dominates American life: body weight, grocery produce, deli counter cuts, freight shipping costs, gym weights, and building material quantities are all measured in pounds and ounces. American recipes use pounds for meat and large quantities. The pound derives from the Roman 'libra pondo' (a pound by weight) - hence both the symbol 'lb' (from libra) and the British currency symbol '£'.
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
| Pounds (lb) | Slugs (slug) |
|---|---|
| 1 lb | 0.031081 slug |
| 2 lb | 0.0621619 slug |
| 5 lb | 0.155405 slug |
| 10 lb | 0.31081 slug |
| 25 lb | 0.777024 slug |
| 50 lb | 1.55405 slug |
| 100 lb | 3.1081 slug |