Rooftop Equipment Wind Pressure Calculator

Important Message from Engineering Express

By clicking below, you agree that the use of this design aid is for estimating purposes only. Results are not valid for use & no construction or design shall be performed without the review and certification by a registered professional engineer.

No warranty or guarantee whatsoever is offered with any results obtained herein.



Also watch our Wall Pressure Tutorial to learn more

This calculator determines site-specific wind pressures for rooftop equipment based on site-specific conditions and unit information. 

This calculator is for estimating purposes only and NOT for permit use. Results are only valid when reviewed, signed, and sealed by a Professional Engineer from Engineering Express. Click “Order Certified Results” to order a review and certification delivered to you for permit.

See calculator support page for explanations, examples, limitations & conditions of use.
Mobile Users: Please tilt phone horizontally for optimal experience. (Calculator works best on a wider screens.)


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Calculations are based on ASCE 7-16 Section 29.4.1 Design Wind Loads: Other Structures: Rooftop Equipment and Structures for Buildings. Calculations are valid for: ASCE 7-10 & 7-16, FBC 2017 & 2020, and IBC 2012, 2015, & 2018.

ver aeb Crafted with love by Eric Reit and Gabriel Saslafsky.
Rooftop Equipment Wind Pressure Calculator
Fill in all orange fields. Click "Help - Glossary" for more information.
Input Site-Specific Conditions:
Ultimate Wind Velocity, Vult  mph
ASCE Exposure Category 
Mean Roof Height, MRH  ft
In Florida? (Affects Clearance)
Input Unit Information: (See Image Below)
# of Units (Max. 5)
Name / Unit  Unit Clearance
Model Depth Height Height
Number (in) (in) (in)
U.N.O. by AHJ: Min. Clearance (in) 
U.N.O. by AHJ: Min. Clearance (in) 
U.N.O. by AHJ: Min. Clearance (in) 
U.N.O. by AHJ: Min. Clearance (in) 
U.N.O. by AHJ: Min. Clearance (in) 
Output: Design Wind Pressures (ASD)
Name / Lateral Uplift
Model Pressure Pressure
Number (± psf) (psf)
Figures for Unit Information:

Rooftop Equipment Wind Pressure Calculator


Calculate mechanical rooftop equipment wind pressures & stand clearance heights for up to 5 units. Order certified copies for permit.

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Dimensions N/A
Plan Format

Digitally Sealed File, Sealed Hardcopy

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