Convert stone to kilograms instantly using the exact factor, where one stone is 6.35029318 kilograms (fourteen pounds, each of 0.45359237 kilograms). The stone is a British weight unit still common in the UK and Ireland for body weight, and this conversion turns it directly into metric kilograms used almost everywhere else, which is handy for medical forms, fitness apps, and international comparisons. Type any number of stone, including decimals, and the kilogram value appears live as you type, carried to several decimals for accuracy. If your weight is stone and pounds, convert the pounds to a decimal stone first for a precise result. Because the factor is not a round number, the tool keeps you exact. It runs entirely in your browser, so it is instant, private, and works offline once the page has loaded.