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To convert kilograms to stones, multiply by 0.157473. So 70 kg = 11.023 st, 80 kg = 12.598 st, and 100 kg = 15.747 st. One stone equals exactly 14 pounds or 6.35029 kilograms, making it a unit exclusive to the British Isles.
In the United Kingdom and Ireland, body weight is traditionally described in stones — you're more likely to hear "I weigh 11 stone 4" than "72 kg" in casual British conversation. This habit persists even as younger generations increasingly use kilograms, especially in medical and fitness contexts.
Did you know? The stone has been a unit of weight since at least the 14th century in England. Its value was fixed at exactly 14 pounds in 1835 by the Weights and Measures Act. No other country uses stones as a standard body weight unit today.
British medical records and GP consultations still routinely record patient weight in stones and pounds. Weight-loss programmes in the UK track progress in stones. Horse racing weighs jockeys in stones and pounds. Anyone relocating to the UK, or following British health media, will encounter weight in stones regularly.