


CFM Calculator 



Side A in Feet 


Side B in Feet 


Total SqFt 


Ceiling Height in Feet 


Total Volume in CuFt 


Air Changes Per Volume 


Minutes 


CFM 




Round Duct 



Radius of Round Duct 


Diameter 


Area 


Length 


Volume 




Square or Rectangular Duct 



Side A in Inches 


Side B in Inches 


Area SqIn 


Length 


Volume CuIn 




Air Velocity in Round or Rectangular Duct 



Velocity Pressure in Inches W.G. 


Flow Velocity in Feet Per Minute 




Temperature Conversion (Celsius and Fahrenheit) 



Fahrenheit to Celsius 


Celsius 


Celsius to Fahrenheit 


Fahrenheit 




Fahrenheit to Rankine 



Fahrenheit 


Rankine 




Celsius to Kelvin 



Celsius 


Kelvin 




Charles Law (Jacques Charles 1787) 



Initial Temperature in Fahrenheit 


Final Temperature in Fahrenheit 


Initial Volume in CuFt 


Initial Temperature Rankine 


Final Temperature Rankine 


Final Volume 


Percent of Original Volume 




PSIG to PSIA 



PSIG 


PSIA 




PSIA to PSIG 



PSIA 


PSIG 




Boyle's Law (16271691) 



Initial Volume in CuFt 


Initial Pressure PSIG 


Final Pressure PSIG 


Initial Pressure PSIA 


Final Pressure PSIA 


Final Volume in CuFt 


Times Greater than Initial Vol 




Electric Charge 


Finding the Coulombs 



Current 


Time 


Coulombs 




Finding the Current 



Coulombs 


Time 


Current 




Ohms Law Solve for Resistance 



E Voltage 


I Amps or Current 


R Resistance 

Ohms Law Solve for Amperage or Current 



E Voltage 


R Resistance 


I Amps or Current 

Ohms Law Solve for Voltage 



I Amps or Current 


R Resistance 


E Voltage 

Ohms Law Solve for Power 



E Voltage 


I Amps or Current 


P Power 

Ohms Law Solve for Amperage or Current 



P Power 


E Voltage 


I Amps or Current 

Ohms Law Solve for Voltage 



P Power 


I Amps or Current 


E Voltage 

Ohms Law Solve for Power 



I Amps or Current 


R Resistance 


P Power 

Ohms Law Solve for Power Factor 



E Voltage 


I Amps or Current 


PF Power Factor 


P Watts (True Power) 


S Volt Amps (Apparent Power) 


Resistance 




Motor Speed 



Poles 


Hertz or Frequency 


Frequency (120 x Voltage) 


Speed in RPMs 




Motor Slip 



Synchronous Speed in RPM 


Rotor Speed 


Percent of Slip 




Capacitors in Series 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 



Total Capacitance in MFD 







Capacitors in Parallel 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 


MFD 



Total Capacitance in MFD 
