Horsepower (metric) to BTU (IT) per second conversion calculator shown above calculates how many BTU (IT) per second are in 'X' horsepower (metric) (where 'X' is the number of horsepower (metric) to convert to BTU (IT) per second). In order to convert a value from horsepower (metric) to BTU (IT) per second (from hp to BTU/s) type the number of hp to be converted to BTU/s and then click on the 'convert' button.