Stone to kg Converter
Convert stone values to kilograms quickly and accurately.
How the Stone to Kilogram Conversion Works
The stone (st) is a unit of weight used primarily in the United Kingdom and Ireland for measuring body weight. One stone is defined as exactly 6.35029318 kilograms (kg). This converter applies that fixed conversion factor to any stone value you enter.
The formula used is: kilograms = stones × 6.35029318
For example, 10 stones multiplied by 6.35029318 equals 63.5029 kg. The converter rounds results to a practical decimal precision for everyday use.
How to Use the Converter
- Enter the weight in stones into the input field. You can use whole numbers or decimal values (e.g., 12 or 9.5).
- The kilogram equivalent is calculated instantly as you type or after clicking the convert button.
- Copy or note the result. You can clear the input to start a new conversion.
No additional steps are required. The tool handles the calculation automatically.
Example Conversion
Input: 11 stone
Calculation: 11 × 6.35029318 = 69.85322498 kg
Result: Approximately 69.85 kg
This is a common conversion for someone tracking their body weight in metric units after using a scale that measures in stones.
Understanding Your Results
The result is the exact metric equivalent of your stone input. Because the conversion factor has many decimal places, the output is typically rounded to two decimal places for readability. This level of precision is sufficient for most practical purposes, including medical, fitness, and general weight tracking.
If you need greater precision, the underlying calculation uses the full conversion factor. The displayed rounding does not affect the accuracy of the conversion itself.
Common Mistakes to Avoid
- Confusing stones with pounds: A stone is 14 pounds, not a single pound. Ensure you are entering a stone value, not a pound value.
- Using an incorrect conversion factor: Some approximations use 6.35 kg per stone. While close, this introduces small errors over multiple conversions. This tool uses the exact factor of 6.35029318.
- Misreading decimal results: A result of 63.5 kg is not the same as 6.35 kg. Pay attention to the decimal place.
Practical Use Cases
- Medical and health tracking: Converting body weight from stones to kilograms for medical records or fitness apps that use metric units.
- International travel and relocation: Understanding weight limits or personal weight when moving between countries that use different measurement systems.
- Shipping and logistics: Converting package or cargo weights provided in stones to kilograms for international shipping documentation.
- Recipe and ingredient conversion: Some older UK recipes may list ingredient weights in stones; converting to kilograms allows for accurate scaling.
Frequently Asked Questions
What is a stone in weight?
A stone is a unit of weight equal to 14 pounds (lb) or 6.35029318 kilograms. It is commonly used in the UK and Ireland for measuring body weight.
Why is the conversion factor 6.35029318?
This is the exact definition of a stone in kilograms, based on the international agreement on the pound being exactly 0.45359237 kg. Since one stone equals 14 pounds, multiplying 14 by 0.45359237 gives 6.35029318.
Can I convert half a stone?
Yes. Enter decimal values such as 0.5 for half a stone. The converter will calculate the equivalent in kilograms accurately.
Is this converter accurate for medical use?
Yes. The conversion uses the exact international standard. The precision is suitable for medical and clinical weight tracking.
How do I convert kilograms back to stones?
Divide the kilogram value by 6.35029318. For a quick approximation, divide by 6.35.