Enter the number of pounds or kilograms (KG) in the first calculator and click on Calculate. You o not need to do both; the system will calculate the conversion for you. The equivalent weight in stones is returned. You should use the same process in the second calculator, the only difference being that your entry is the number of stones while kilograms and pounds are returned. Click on Calculate to see the equivalent weight. The conversion factor is that 1 stone is the approximate equivalent of 14 US pounds, at least to the 6th decimal place.