
How
To Determine The Open Area of Square Woven
Mesh 








2 


Percent Open Area 
= 

1


(Mesh Count x Wire Diameter) 


X 
100 













EXAMPLE 1
40 x 40 Mesh, 0.010" 
To determine the open
area of 40 Mesh, 0.010" Wire Diameter 

1 

Multiply the Mesh
Count x Wire Diameter. 
40 x 0.010" = 0.400" 
2 

Subtract the result
above from 1. 
1  0.400" = 0.600" 
3 

Square the above
result (multiply by itself). 
0.600 x 0.600 = 0.36 
4 

Multiply the result
by 100. 
100 x 0.36 = 36 
5 

The solution should
be expressed as as: 
36% 



EXAMPLE 2
100 x 100 Mesh, 0.0045" 
To determine the open
area of 100 Mesh, 0.0045" Wire Diameter 

1 

Multiply the Mesh
Count x Wire Diameter. 
100 x 0.0045 = 0.45 
2 

Subtract the result
above from 1. 
1  0.450 = 0.55 
3 

Square the above
result (multiply by itself). 
0.55 x 0.55 = 0.3025 
4 

Multiply the result
by 100. 
100 x 0.3025 = 30.25 
5 

The solution should
be expressed as as: 
30.25% 


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Last modified:
December 15, 2016 
