Watt seconds to inch-pounds force conversion calculator above calculates how many inch-pounds force are in 'X' watt seconds (where 'X' is the number of watt seconds to convert to inch-pounds force). In order to convert a value from watt seconds to inch-pounds force (from Ws to in lbf) type the number of Ws to be converted to in lbf and then click on the 'convert' button.