Stone to Slug Conversion Calculator: Free Online Tool
Convert stones to slugs with our free online weight converter.
Stone to Slug Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Stone).
- The converted value in Slug will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Weight category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Stone to Slug
Converting Stone to Slug involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Stone = 0.435133 slugsExample Calculation:
Convert 5 stones: 5 × 0.435133 = 2.17566 slugs
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Stone and a Slug?
The stone (st) is a unit of mass in the British imperial system, defined as exactly 14 avoirdupois pounds. This is equivalent to approximately 6.35 kilograms.
The slug is a unit of mass in the Foot-Pound-Second (FPS) system of units, primarily used in Imperial and US customary systems. It is defined as the mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it. It's approximately 14.5939 kilograms.
Note: The Stone is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Slug belongs to the imperial/US customary system.
History of the Stone and Slug
The stone has historical roots in trade, where actual stones were used as weights. Its value varied significantly by commodity and region before being standardized at 14 pounds in Britain for general purposes.
The term "slug" was coined by Arthur Mason Worthington around 1900. It was derived from the concept of inertia (sluggishness) and designed to simplify calculations in Newtonian mechanics (F=ma) when using imperial units of force (lbf) and acceleration (ft/s²).
Common Uses for stones and slugs
Explore the typical applications for both Stone (imperial/US) and Slug (imperial/US) to understand their common contexts.
Common Uses for stones
- Body Weight: Primarily used in the UK and Ireland to express human body weight.
- Animal Weighing: Occasionally used informally for weighing large animals or agricultural produce in some Commonwealth countries.
- Historical Usage: Largely historical or colloquial use outside of body weight context.
Common Uses for slugs
- Engineering (primarily aerospace and dynamics): Used in calculations involving force, mass, and acceleration within the Imperial system.
- Physics Education: Sometimes used when teaching mechanics with Imperial units.
Frequently Asked Questions
Questions About Stone (st)
How many pounds are in a stone?
There are 14 pounds (lb) in 1 stone (st).
Is the stone used outside the UK and Ireland?
Its use is very limited outside the UK and Ireland, mainly for historical context or by people familiar with imperial body weight measurements.
Why is it called a stone?
The name originates from the historical practice of using stones of a standardized size as weight standards in trade.
About Slug (sl)
How is the slug defined?
It's defined by Newton's second law (F=ma). 1 slug = 1 lbf / (1 ft/s²).
How many pounds-mass are in a slug?
One slug is approximately equal to 32.174 pounds-mass (lbm). This value corresponds to the standard acceleration due to gravity (g) in ft/s².
Why is the slug unit used?
It simplifies calculations in the F=ma formula when using pounds-force (lbf) and feet/second² (ft/s²) for acceleration, avoiding the need for a gravitational constant (g) in the equation.
Conversion Table: Stone to Slug
| Stone (st) | Slug (sl) |
|---|---|
| 1 | 0.435 |
| 5 | 2.176 |
| 10 | 4.351 |
| 25 | 10.878 |
| 50 | 21.757 |
| 100 | 43.513 |
| 500 | 217.567 |
| 1,000 | 435.133 |
All Weight Conversions
Other Units from Weight
- Kilogram (kg)
- Gram (g)
- Milligram (mg)
- Pound (lb)
- Ounce (oz)
- Ton (metric) (t)
- Ton (US) (ton)
- Ton (UK) (long ton)
- Microgram (µg)
- Carat (ct)
- Troy Ounce (oz t)
- Pennyweight (dwt)
- Grain (gr)
- Dram (dr)
- Quintal (q)
- Atomic Mass Unit (u)
- Pavan (India) (pavan)
- Kati (India) (kati)
- Masha (India) (masha)
- Dina (India) (dina)
- Pras (India) (pras)
- Lota (India) (lota)