British thermal units (59 °F) to horsepower-hour converter on this page calculates how many horsepower-hour are in 'X' British thermal units (59 °F) (where 'X' is the number of British thermal units (59 °F) to convert to horsepower-hour). In order to convert a value from British thermal units (59 °F) to horsepower-hour type the number of British thermal units (59 °F) to be converted to hph and then click on the 'convert' button.