Main Wind Force Resisting System analysis for frames, diaphragms, and shear walls — built on the directional and envelope procedures of ASCE 7-22. Plans from $35/mo — start with a 7-day free trial, no credit card.
Add the MWFRS calculator to your account — Directional + Envelope in one workflow. Start with a 7-day free trial, no credit card.
Solo engineers & small firms
20% OFF - Billed annually at $336/year
Teams up to 5 — best value
20% OFF - Billed annually at $564/year
Teams up to 10, advanced features
Unlimited users for large orgs
Contact us for custom pricing
Each calculator is its own subscription — add only what you need. MWFRS pairs naturally with Components & Cladding; bundle everything with WindLoad Complete.
A focused preview of the analysis we are building for structural frames and lateral systems.
Surface-by-surface wind pressures for the directional method. Resolve loads on the structural system for each principal wind direction.
The envelope method for qualifying low-rise buildings. Pressure zones applied across the frame for the governing wind directions.
Roll surface pressures into the loads your lateral system actually carries — the forces engineers size members against.
They answer different questions about the same building. Most permit sets need both.
Need C&C now? Windows, Doors & Storm Shutters is live →
The professionals who design and review lateral systems.
Resolve wind on frames, braces, and shear walls fast, then size members against base shear and story forces.
Coordinate lateral demands early with clean documentation that supports the structural team's calculations.
A guided workflow routes you to the directional or envelope method without second-guessing the standard.
Verify the building's wind demands and submit clear, defensible documentation for plan review.
Trace every value to its ASCE 7-22 section — fully cited reports that streamline the approval back-and-forth.
Keep wind analysis in one workflow from concept through permit, with PE sign-and-seal available in all 50 states.
Use our live tools today and explore the rest of the catalog.
C&C for vertical walls and openings.
Every U.S. ZIP, no signup required.
Browse the full catalog and pricing.
No paid testimonials — just a verifiable 24-year record.
Yes — the Directional (Chapter 27) and Envelope (Chapter 28) procedures are live, with a 7-day free trial. Add MWFRS to your account from the pricing above.
MWFRS covers the whole-building system that resists wind — frames, diaphragms, and shear walls — using building-wide pressures. Components & Cladding covers individual elements like windows, doors, and roof panels using localized peak pressures. Most projects need both.
The directional procedure in Chapter 27 and the envelope procedure in Chapter 28. The calculator will guide you to the correct method based on building height, geometry, and your project requirements.
Yes. Like our other calculators, it will generate a detailed Engineering Report with every step, coefficient, and ASCE 7-22 citation, exportable to PDF, Excel, CSV, or print.
Yes. PE sign-and-seal is available in all 50 states through our firm's licensed engineer network. Florida projects up to three stories are handled by our in-house Florida P.E.
ASCE 7-22, the current edition. We have navigated 7 editions of ASCE 7 since 2002 and always build on the latest standard.
MWFRS is its own subscription, separate from Components & Cladding — add only the calculators you need. Plans are $35 / $59 / $149 a month (Starter / Pro / Premium), or bundle everything with WindLoad Complete.
Yes. Our Windows, Doors & Storm Shutters calculator is live today, and a free wind speed lookup handles every U.S. ZIP. Use those now while MWFRS is finalized.
Directional and Envelope in one ASCE 7-22 workflow, on the platform thousands of professionals have trusted since 2002. Add it in minutes, or start with a free wind speed lookup.