Stone to Kilogram Conversion Calculator: Free Online Tool
Convert stones to kilograms with our free online weight converter.
Stone to Kilogram Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Stone).
- The converted value in Kilogram 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 Kilogram
Converting Stone to Kilogram involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Stone = 6.35029 kilogramsExample Calculation:
Convert 5 stones: 5 × 6.35029 = 31.7515 kilograms
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 Kilogram?
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 kilogram is the base unit of mass in the International System of Units (SI). It is defined based on the fixed numerical value of the Planck constant.
Note: The Stone is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Kilogram belongs to the metric (SI) system.
History of the Stone and Kilogram
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.
Originally defined as the mass of one liter of water. Later, it was represented by the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder. In 2019, the definition was changed to be based on fundamental physical constants.
Common Uses for stones and kilograms
Explore the typical applications for both Stone (imperial/US) and Kilogram (metric) 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 kilograms
- Global Standard: The primary unit for mass in science (physics, chemistry), engineering calculations, and international trade (e.g., commodity pricing).
- Body Weight: Widely used worldwide (outside the US/UK primarily) for measuring human body weight for health and fitness tracking.
- Food & Groceries: Used for selling and labeling larger quantities of food items like rice, flour, sugar, and some produce in metric countries.
- Shipping & Logistics: Standard unit for calculating weights of packages and freight internationally.
- Everyday Objects: Measuring the mass of common items like furniture, electronics, or luggage.
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 Kilogram (kg)
What is the base unit of mass in the SI system?
The kilogram (kg) is the base unit of mass in the International System of Units (SI).
Is the kilogram used worldwide?
Yes, it's the global standard for science, engineering, and international trade, and widely used for everyday measurements in most countries.
How was the kilogram originally defined?
It was initially defined as the mass of one liter of water, later represented by a physical artifact (the IPK), and is now based on the Planck constant.
Conversion Table: Stone to Kilogram
| Stone (st) | Kilogram (kg) |
|---|---|
| 1 | 6.35 |
| 5 | 31.752 |
| 10 | 63.503 |
| 25 | 158.757 |
| 50 | 317.515 |
| 100 | 635.029 |
| 500 | 3,175.147 |
| 1,000 | 6,350.293 |
All Weight Conversions
Other Units from Weight
- Gram (g)
- Milligram (mg)
- Pound (lb)
- Ounce (oz)
- Ton (metric) (t)
- Ton (US) (ton)
- Ton (UK) (long ton)
- Microgram (µg)
- Carat (ct)
- Slug (sl)
- 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)