What are typical exposure categories?

Exposure categories define the terrain around your structure: Exposure B for urban areas with obstructions, Exposure C for open terrain with scattered obstructions (most common), and Exposure D for flat, unobstructed areas like coastal regions.

Wind Pressure & Force Calculator

Calculate wind pressure and force on structures based on wind speed, exposure category, and dimensions

Wind Speed (mph)

Typical values: 85-150 mph for hurricanes

Exposure Category

Structure Height (ft)

Structure Width (ft)

Structure Length (ft)

Importance Factor

Results

Velocity Pressure (q_z): – psf

Design Wind Pressure (p): – psf

Total Wind Force: – lbs

0 lbs

Frequently Asked Questions

Velocity pressure is the dynamic pressure caused by wind at a specific height above ground. It’s calculated based on wind speed, exposure category, and height. The formula is q_z = 0.00256 × K_z × K_zt × K_d × V² × I where K factors account for exposure, topography, wind directionality, and importance.

Design wind pressure (p) is calculated using the formula p = q × G × C_p – q_i × (GC_pi), where q is velocity pressure, G is gust factor, C_p is external pressure coefficient, and GC_pi is internal pressure coefficient. Our calculator simplifies this using ASCE 7 standards.

Exposure categories define the terrain around your structure:

Exposure B: Urban and suburban areas with numerous closely spaced obstructions
Exposure C: Open terrain with scattered obstructions (most common)
Exposure D: Flat, unobstructed areas exposed to wind (coastal areas, airports)