Welded wire mesh weight (just square welded wire mesh) calculate:
For Materials of Iron, Steel, or Stainless Steel,

Weight= Wire Dia (MM) 2 x Mesh No. X Roll Width (M) x Roll Length (M)/2
Note: 
 Wire diameter (must be in MM).
     2. Mesh Number per inch.
     3. Roll/Piece Width (must be in Meter).
     4. Roll/Piece Length (must be in Meter).

Example 1:
Gal. Welded Wire Mesh 1/2inch x 1/2inch x 0.711MM X 3Feet X 100Feet
Weight=0.7112 x 2 x 0.914 x 30.48 / 2 =14.1KG

Example 2:
S.S. welded wire mesh 100mesh x 100mesh x 0.10MM x 1M x 30M
Weight=0.102 x 100 x 1 x 30 / 2 =15.0KG.

That means the theory weight of S.S. mesh 100mesh x 100mesh x 0.1MM per 1M x 30M roll is 15.0KG.
Sometimes factory offered the weight to be 14.7kg as the weight tolerance is around 2%.

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That will help us give you a valid quotation.