British thermal units (59 °F) to watt seconds conversion calculator shown above calculates how many watt seconds are in 'X' British thermal units (59 °F) (where 'X' is the number of British thermal units (59 °F) to convert to watt seconds). In order to convert a value from British thermal units (59 °F) to watt seconds simply type the number of British thermal units (59 °F) to be converted to Ws and then click on the 'convert' button.