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