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Wind Load CalculatorWind Load & Pressure Calculator

Calculate the design wind pressure and total force on fences, panels, pergolas and roofs from a basic wind speed, terrain and height. Size posts, fixings and bracing to resist real wind loads.

Design PressureTotal Force kNTerrain + HeightIS 875 MethodPDF Report
WL

Wind Load Calculator

Wind Load & Pressure Calculator

Wind & Site
m/s

From local wind map. India 33-55 m/s.

m
Surface
m2

Area facing the wind (fence, wall, panel).

factor

Solid wall/fence ~1.2-1.3, pitched roof varies.

OK
Wind Load Results
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kPa
Design Pressure
-
kN
Total Force
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kgf
Force (kg)
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Pa
Design Pressure
ParameterValueDetail
Wind Load Calculation
About Wind Load Calculator
Wind exerts pressure on any exposed surface - a fence, cladding panel, pergola or roof - and that pressure becomes a force the structure and its fixings must resist. This calculator converts a basic wind speed into design pressure (accounting for terrain and height) and the total force on your surface, so you can size posts, fixings and bracing sensibly. It follows the q = 0.613V squared approach used in IS 875 and Eurocode.
Where Is This Used?
Fence + Gate DesignPergola + CarportCladding FixingsSignage StructuresRoof LoadsOutdoor Timber Builds
Formulas Used
Dynamic pressure q = 0.613 x V squared (V in m/s, q in Pa)Design pressure = q x Terrain factor x Height factorHeight factor = (Height / 10) ^ 0.14 (above 10m)Wind force = Design pressure x Area x Force coefficient1 kN ~ 102 kgf (divide Newtons by 9.81)
Frequently Asked Questions
Where do I get the basic wind speed?
From your national wind map or code. India's IS 875 Part 3 divides the country into zones from 33 to 55 m/s; coastal and cyclone-prone areas are highest. Always use the design wind speed for your specific location rather than a guess - it has the biggest single effect because force scales with speed squared.
Why does wind force grow with the square of speed?
Because the energy in moving air rises with the square of its velocity. Doubling the wind speed quadruples the pressure. This is why a storm at 40 m/s is dramatically more destructive than a breeze at 20 m/s, and why using the correct design speed (not an average) is critical for safety.
What force coefficient should I use?
It depends on the shape and how solid the surface is. A solid flat fence or wall is around 1.2-1.3; a permeable (slatted) fence is much less because wind passes through; curved or streamlined shapes are lower still; and roofs have complex pressure and suction zones. For solid timber panels, 1.2-1.3 is a reasonable starting value.
ResourcesView the formulasFormula Library
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