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