Flow Through Orifice Moss Formula Calculator 
Units 
Blocks shown as light blue are editable 
Diameter orifice
d = 

in^{2}

Area of orifice
A = 

in^{2}

Coefficient
of flow C = 

 
Upstream gauge
pressure P = 

psig 
atmosphetic
pressure atm = 

psi 
absolute pressure
P = 

psia 
Upstream temperature
T = 

° F 
converted Upstream
temperature T = 

° R 
Air density
D = 

lb/ft^{3}

Moss Formula Calculated Results 
Discharge W
= 

lb/sec 
Discharge W
= 

ft^{3}/sec

Discharge W
= 

ft^{3}/min

Discharge W
= 

ft^{3}/hr
