This on the web oneway conversion tool converts energy units from horsepower hours ( hp h ) into tons of TNT ( tn ) instantly online. 1 horsepower hour ( hp h ) = tons of TNT ( tn ). How many tons of TNT ( tn ) are in 1 horsepower hour ( 1 hp h )? How much of energy from horsepower hours to tons of TNT, hp h to tn? Exchange values and measures from one energy unit to another unit by ...