Stone to Kg Converter
Convert stones to kilograms instantly with this free weight converter. Enter weight in stones and get exact kg using 1 st = 6.35029 kg for body weight and fitness tracking.
About This Calculator
The Stone to Kg Converter is a free online tool that allows you to convert weight measurements from stones (st) to kilograms (kg) instantly. Whether you are tracking your body weight, monitoring fitness progress, or working with imperial weight measurements from the United Kingdom or Ireland, this converter provides accurate and reliable results using the standard conversion factor.
The stone is a traditional unit of mass in the British imperial system, still widely used in the UK and Ireland for expressing body weight. One stone is equal to 14 pounds or approximately 6.35 kilograms. In most other countries, including the United States (for scientific contexts), Canada, Australia, and across Europe, the kilogram is the standard unit of mass under the International System of Units (SI).
To convert stones to kilograms, multiply the weight in stones by 6.35029. For example, if you weigh 12 stones, your weight in kilograms would be 12 × 6.35029 = 76.2035 kg. Our calculator handles both whole numbers and decimal values (e.g., 10.5 stones), making it ideal for precise body weight tracking and health monitoring.
Common uses: Body weight measurement for fitness apps, medical records conversion, travel and relocation between countries using different systems, sports weight classes, and general reference between imperial and metric systems.
Regional Notes
UK & Ireland: Body weight is commonly measured in stones and pounds. This converter is essential for converting to kilograms for medical records, fitness trackers, and international travel.
US: Body weight is typically measured in pounds. To convert stones to pounds, multiply by 14. This tool helps when encountering UK weight references or international health standards.
India & other metric countries: Kilograms are the standard. This converter helps interpret UK or US weight references in fitness content, sports, or travel contexts.
Frequently Asked Questions
How do I convert stones to kilograms?
To convert stones to kilograms, multiply the number of stones by 6.35029. For example, 10 stones × 6.35029 = 63.5029 kg. Our calculator does this instantly for you.
What is a stone in weight measurement?
A stone (st) is a unit of mass in the British imperial system, equal to 14 pounds (lbs) or 6.35 kg. It is commonly used in the United Kingdom and Ireland for measuring body weight.
How accurate is this stone to kg converter?
This converter uses the exact conversion factor of 1 stone = 6.35029 kilograms, providing highly accurate results to multiple decimal places suitable for fitness tracking, medical purposes, and general use.
Can I convert kilograms back to stones?
Yes, to convert kilograms to stones, divide the weight in kilograms by 6.35029. For example, 70 kg ÷ 6.35029 ≈ 11.02 stones. You can also use our kg to stones converter on Calculy.
Where is the stone unit primarily used?
The stone is primarily used in the United Kingdom, Ireland, and to some extent in Commonwealth countries for measuring body weight. Most other countries use kilograms as the standard unit of mass.
Can I convert fractional stone values?
Yes, you can enter decimal values such as 8.5 or 12.75 stones. The calculator will convert fractional stones to kilograms with the same precision as whole numbers.
Is this stone to kg converter free to use?
Yes, all calculators on Calculy, including the stone to kg converter, are completely free to use with no hidden charges or registration required.
Why is the conversion factor 6.35029?
One stone is defined as exactly 14 pounds, and one pound is defined as 0.45359237 kilograms. Therefore, 1 stone = 14 × 0.45359237 = 6.35029318 kg, commonly rounded to 6.35029 kg.