Stone to Kg Converter
Stones and pounds are still a common way to talk about body weight in Britain, Ireland and among many people in New Zealand, but our scales, doctors and official records work in kilograms, and this converter bridges the two instantly in both directions. Type a weight in stones and pounds and it gives you the kilograms; type a weight in kilograms and it gives you the stones and pounds. Everything updates as you type. The conversion rests on a couple of fixed factors. A stone is exactly fourteen pounds, and one pound is about 0.4536 kilograms, which makes a single stone equal to 6.35029 kilograms. So converting from stones and pounds means turning the whole lot into pounds first, then multiplying by the pound-to-kilogram factor, while going the other way splits the kilograms back into whole stones and the leftover pounds. The reason this is so useful is that weight is one of the few everyday measurements where New Zealanders genuinely straddle two systems: someone might know their weight in kilograms from a recent check-up but think of a goal or a memory in stones, or be reading a British recipe, fitness plan or health guideline that uses imperial units. Having a clean two-way converter removes the mental arithmetic and the risk of slipping up on the fourteen-pounds-to-a-stone step that trips people up. That makes it genuinely useful for anyone tracking weight or fitness across the two systems, for health and medical contexts, for following overseas programmes, and for making sense of older or British figures. The exact conversion factors are used, so the results are accurate. The method and a worked example are explained clearly below.
Stones and pounds to kilograms
Kilograms to stones and pounds
How it works
One stone is 14 pounds, and one pound is 0.453592 kilograms, so one stone is 6.35029 kilograms. To convert stones and pounds to kilograms, multiply the stones by 14, add the pounds, then multiply by 0.453592. To go back, divide the kilograms by 6.35029 for the stones, and turn the remainder into pounds.
Worked example
For 11 stone 0 pounds: that is 11 times 14, which is 154 pounds, times 0.453592, giving about 69.85 kilograms. Going the other way, 70 kilograms is about 11 stone 0.3 pounds.