Wind Load Calculator

Industry-Grade IS 875 (Part 3: 2015) Compliant Calculator

Select the wind zone for your location in India. Basic wind speed (Vb) depends on geographic location.

Wind Zone & Basic Wind Speed

Coastal areas like Chennai, Mumbai, Kolkata fall in higher zones. Inland areas like Delhi, Bangalore in lower zones.

Select terrain type based on ground surface roughness and obstructions around your site.

Category 1 – Exposed Open Terrain

Few or no obstructions. Average height <1.5 m. (Airfields, coastal areas, flat plains)

Category 2 – Open Terrain

Scattered obstructions 1.5–10 m height. (Parks, suburbs, undeveloped areas)

Category 3 – Suburban/Industrial

Numerous obstructions up to 10 m. (Towns, developed industrial areas) — TYPICAL

Category 4 – Urban/Dense Built-up

Many tall buildings >25 m. (City centres, dense complexes)

Classify your structure based on maximum dimension (height or width, whichever is greater).

Structure Class

Class A: Villas, bungalows. Class B: 5–10 storey buildings. Class C: Modern skyscrapers.

Height from Ground (m)Mean roof height (h)

Building Width (m)Windward breadth

Topography Factor (k₃)

Importance Factor (k₄)

Internal Pressure (Cpi)

For enclosed buildings with normal openings, use +0.2 or −0.2

Click "Calculate Wind Load" to see results.