Mass Flow Converter Mass Flow Converter converts kilogram per second, pound mass per second and pound mass per minute. Select fromKilogram/second (kgr/sec)Pound mass/sec (lbm/sec)Pound mass/min (lbm/min) Select toKilogram/second (kgr/sec)Pound mass/sec (lbm/sec)Pound mass/min (lbm/min) Convert Clear