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