




Rectangular
Mesh Formula Open Area Formula 
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sales@wovenwire.com 


% OPEN AREA = (1ND) (1nd) x 100

N = Wires Per Inch in Warp 
n = Wires Per Inch in Shute 
D = Diameter of Warp Wire 
d = Diameter of Shute Wire 


EXAMPLE 1 
Assume the following: 
24 warp wires per inch 
70 shute wires per inch 
The warp wire diameter
is 0.015" 
The shute wire diameter
is 0.010" 

1 

Multiply the warp
wire count (N) by the warp diameter (D). 
24
x 0.015 = 0.360 
2 

Subtract the result
above from 1. 
1  0.360 = 0.640 
3 

Multiply the
shute wire count (n) by the shute diameter (d). 
70
x 0.010 = 0.70 
4 

Subtract the result
above from 1. 
1
 0.70 = 0.30 
5 

Multiply the result
from step 2 by the result from step 4. 
0.64 x 0.30 = 0.19 
5 

Multiply the result
above by 100 to covert to a percentage. 
0.19 x 100 = 19% 






EXAMPLE 2 
Assume the following: 
72
warp wires per inch 
36 shute wires per inch 
The warp wire diameter
is 0.008" 
The shute wire diameter
is 0.07" 

1 

Multiply the warp
wire count (N) by the warp diameter (D). 
72
x 0.008 = 0.576 
2 

Subtract the result
above from 1. 
1  0.576 = 0.424 
3 

Multiply the shute
wire count (n) by the shute diameter (d). 
36
x 0.013 = 0.468 
4 

Subtract the result
above from 1. 
1
 0.468 = 0.532 
5 

Multiply the result
from step 2 by the result from step 4. 
0.424 x 0.532 = 0.225 
5 

Multiply the result
above by 100 to covert to a percentage. 
0.225 x 100 = 22.5% 



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Last modified:
March 05, 2017 







