Welded Wire Mesh Weight Calculator

How is welded wire mesh weight calculated?

Welded mesh consists of bars laid in two perpendicular directions and welded where they cross. Its weight is the sum of the bars in both directions. The mass of one bar per metre is m = π / 4 × d² × 7850. Dividing by the bar spacing gives the weight of that direction per square metre:

g = m₁ / s₁ + m₂ / s₂

The sheet weight is the weight per square metre times the sheet area.

Example

For 6 mm bars at 150 mm spacing both ways: the bar mass is π / 4 × 0.006² × 7850 = 0.222 kg/m. One direction gives 0.222 / 0.15 = 1.48 kg/m² and both give 2.96 kg/m². A 5 m by 2.15 m sheet covers 10.75 m², so it weighs about 31.8 kg. Ten sheets come to 318 kg.

Lap allowance

Sheets overlap where they meet, so the area covered is smaller than the sheet area. Add an allowance for laps and cutting waste when ordering. The lap length depends on the bar diameter and the design, so take it from the drawings.

Limits

The calculation assumes bars spread evenly over the area. A real sheet has a whole number of bars and overhangs at the edges, so a manufacturer's catalogue weight may differ by a few percent. This is a weight and quantity tool only and does not tell you which mesh is adequate: reinforcement is selected by structural design.