About Stone to KG
A clear weight conversion tool with practical context, written by Dr Muhammad Usman, MBBS.
About Stone to KG
Stone to KG is more than just a calculator. We designed this tool to provide clarity and context around weight, moving beyond raw numbers to help users understand what their weight means in relation to Body Mass Index (BMI) and general health.
Our core focus is accuracy. All our conversions use the exact international yard and pound agreement definition, where 1 stone equals precisely 6.35029 kg. We combine this mathematical precision with simplicity and real-world usefulness, giving you the answers you need without the clutter.
Why This Site Exists
Most converter sites only show numbers. A raw output of kilograms to stones, or vice versa, lacks the context needed to make informed decisions about health and fitness.
This tool helps you understand what your weight actually means. We include BMI context, health ranges, and height-specific data so the number you see isn't just a raw figure: it's something you can actually use.
About the Author
Dr Muhammad Usman, MBBS
Dr Muhammad Usman is the founder and editor of Stone to KG. He completed his MBBS at Avicenna International Medical University in Bishkek, Kyrgyzstan (2019–2024), where he trained across a broad spectrum of clinical disciplines including internal medicine, surgery, paediatrics, and public health.
Since graduating, Dr Usman has gained hands-on clinical experience as a House Officer, with a particular focus on general medicine, weight management, and translating complex health data into clear, patient-friendly language. He personally reviews the conversion figures and health context on this site for accuracy.
How the content is prepared
Dr Muhammad Usman writes the site's conversion explanations and health context. Conversion results use documented mathematical constants, while health-related explanations should be read as general information rather than a personal assessment.
Where a page discusses health guidance, policy or a current product, we aim to identify the relevant source and check that it is current. A source supports a claim; it does not turn this website into a substitute for a GP, pharmacist or other qualified healthcare professional.
⚠️ Disclaimer
This website provides general informational content and does not constitute medical advice. Always consult a qualified healthcare professional for personal health concerns.
Editorial Standards
Every conversion figure on this site is calculated from internationally recognised constants: 1 stone = 6.35029318 kg exactly, 1 pound = 0.45359237 kg exactly, and 1 stone = 14 pounds exactly. These are not estimates: they are the legal definitions used in the UK under the Weights and Measures Act 1985.
Health context, such as BMI categories, follows NHS guidance. The NHS defines a healthy BMI as 18.5 to 24.9, overweight as 25 to 29.9, and obese as 30 or above. Where we discuss ideal weight ranges, we reference these bands and always note that BMI is a screening tool, not a diagnosis; it does not account for muscle mass, bone density, or body composition.
Pages are reviewed periodically to ensure figures, links, and guidance remain current. The "last updated" date shown on conversion pages reflects the most recent review. If you spot an error, please contact us: corrections are made promptly and transparently.