1 stone is 14 pounds, so i assume that it is the same in the US. so 10 stone would be 140 pounds in US. Stone Weight Pounds. 14 lbs = 1 stone More random info Pounds and stone share the unit of the pound (i.e., an aggregation rather than a conversion to a different scale such as pounds to kilograms). In any case, 14 pounds equals one stone. Historically it was used for produce and other market selling but today it's used largely to express body weight. The convention would be to say 9 stones, 2 for 128 pounds (i.e., 9 x 14 + 2). 1 year ago