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