

Woven Wire
Mesh and Wire Cloth Formulas 


Formula to Determine Mesh Count

If opening and wire diameter are known,
add both and divide the sum into 1.



D = Wire Diameter 
O = Opening 

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Open Area of Rectangular
Woven Mesh

Formula

The percentage of
rectangular wire mesh (also
referred to as off count mesh) open area
may be determined by the following equation . 

% 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 

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Help With This Formula? 


Open Area of Square Woven
Mesh

Formula 
The percentage of
open area for regular square woven mesh having the
same wire diameter in both directions (warp and weft) may be determined by the following equation. 







2 


Percent Open Area

= 

1 

(Mesh Count x Wire
Diameter) 


X 
100 












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Space Cloth Open Area

Formula 
The percentage of
space cloth open area
may be determined by the following equation




Opening 

2 


Percent Open Area = 




X 
100 


Opening + Diameter 






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Wire Cloth Opening
(Aperture)

Formula 
To determine a wire cloth opening,
divide the mesh count into 1, and subtract the wire diameter.



M = Mesh Count 
D = Wire Diameter 
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Slotted Screen Open Area

Formula 
The percentage of
slotted screen open area
may be determined by the following equation



W = 

Width
of Slot Opening 
L = 

Length
of Sloth Opening 
C = 

Length
of Cluster Opening 
D = 

Warp
Wire Diameter 
d = 

Shoot
Wire Diameter 
A = 

Percent
of Open Area 

( 
W
x L 
+ 
2W x C 
) 
(W + D) 
(W + D) 
A = 

x 100 

( L + d + 2( W + d ) ) 



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Last modified:
December 23, 2012 
