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To convert stones to kilograms, multiply by 6.35029. So 11 st × 6.35029 = 69.85 kg, 14 st = 88.9 kg, and 8 st = 50.8 kg. One stone is exactly 14 pounds, so you can also multiply stones by 14 to get pounds, then by 0.453592 to reach kilograms.
Continental Europe, Australia, and most of the non-English-speaking world use kilograms exclusively for body weight. When a British person fills in a health form abroad, joins a European gym, or uses an international fitness app, they need to convert their weight from stones to kilograms.
Did you know? In the UK, bathroom scales still commonly show readings in stones and pounds alongside kilograms. The National Health Service (NHS) officially uses kilograms for drug dosing calculations, even though patients often report their weight in stones.
British athletes competing internationally need weight in kilograms for official records and weigh-ins. NHS drug dosing — particularly for chemotherapy, anaesthesia, and paediatric medication — is calculated per kilogram of body weight. Anyone immigrating from the UK to a metric country needs to convert their medical records.