Calculator Simplex and Duplex Compressor Starts Per Hour Calculator System Air Usage F= SCFM Compressor Output Q= SCFM Cut-out Pressure PH= PSI Cut-in Pressure PL= PSI Tank Size TS= GAL Air Volume @ Cut-out Pressure CU-FT Air Volume @ Cut-in Pressure CU-FT Build-up time MINUTES Bleed-down time MINUTES SIMPLEX STARTS PER HOUR DUPLEX STARTS PER HOUR PER MOTOR View All Converters & Calculators