Florida Wind Load Calculator

If you design, permit, or build in Florida, every project starts with the same question: what is the design wind speed at this address? Florida is the only state in the country with a statewide hurricane code, a dedicated High Velocity Hurricane Zone for its two most populated counties, and a Product Approval database that plan reviewers expect to see referenced on every window, door, and shutter submittal. Getting the wind speed wrong by even five mph can fail a permit submittal — and using a generic national calculator that doesn't know about local jurisdiction overrides is one of the most common ways that happens.

This page is the Florida-specific landing for WindLoadCalc. Enter a Florida ZIP code above and the calculator launches preloaded with the correct ASCE 7-22 wind speed, the right county designation, and any local override your jurisdiction has adopted on top of the baseline map.

Florida Wind Speed Quick Reference

The table below lists representative design wind speeds for major Florida regions, Risk Category II (the most common occupancy — single-family and most multifamily, commercial retail, light industrial), under ASCE 7-22 and Florida Building Code 8th Edition (2023). These are baseline approximations; the calculator above returns the exact value for your specific ZIP code, accounting for local jurisdiction overrides.

What is HVHZ and Why It Matters

HVHZ stands for High Velocity Hurricane Zone. Under the Florida Building Code, HVHZ is a special jurisdiction covering Miami-Dade and Broward counties. It exists because those two counties suffered the worst residential damage in Hurricane Andrew (1992) and the post-Andrew investigations concluded that the rest-of-state code was not strict enough for the densest, most exposed urban population in Florida.

Inside the HVHZ, the building code is meaningfully different from the rest of Florida. Three things change:

• Higher design wind speeds. Miami-Dade uses 175 mph and Broward uses 170 mph for Risk Category II buildings — both above what a raw ASCE 7-22 map lookup would return.
• Product approval via Miami-Dade NOA. Every window, door, shutter, roof tile, and impact-rated assembly installed in HVHZ generally requires a Notice of Acceptance (NOA) issued by Miami-Dade County, which is recognized statewide for HVHZ work.
• TAS 201, 202, 203 testing. HVHZ-rated products must pass Test Application Standard 201 (Large Missile Impact), 202 (Uniform Static Air Pressure), and 203 (Cyclic Wind Pressure). These three tests together are why HVHZ-rated windows cost roughly 2–3× a comparable rest-of-state impact window.

If your project is in Miami-Dade or Broward, every component listed on your wind load report needs an FL# (Florida Product Approval number) that explicitly covers HVHZ use. The calculator includes that flag in its output so plan reviewers can match each opening to a compliant product. For all other Florida counties — including Collier, Palm Beach, and Monroe (Keys) — Florida statewide Product Approval applies, and the HVHZ-specific NOA is not strictly required, although many products carry both ratings.

Florida Building Code 8th Edition (2023)

The Florida Building Code 8th Edition (2023) took effect December 31, 2024. It references ASCE 7-22 as the wind load standard (replacing ASCE 7-16, which was referenced by FBC 7th Edition). What changed between ASCE 7-16 and ASCE 7-22 that matters for Florida:

• Updated wind speed maps — based on the latest hurricane climatology, with revised return-period analysis that shifted some coastal contour lines.
• New "Partially Open" enclosure classification — ASCE 7-22 recognizes four building enclosure types (Enclosed, Partially Open, Partially Enclosed, Open) where 7-16 had three. This affects internal pressure coefficient (GCpi) selection for many Florida lanais, screen enclosures, and carports.
• Revised Components and Cladding (C&C) procedures — Chapter 30 of ASCE 7-22 reorganized the C&C calculation flow for different roof geometries; the calculator handles all six roof shapes the new chapter covers.
• Edge strip "a" minimum — Florida (per FBC R301.2(7)) requires a 4 ft minimum edge strip dimension; ASCE 7-22 elsewhere allows 3 ft. The calculator applies the 4 ft minimum automatically for Florida projects.

WindLoadCalc has been updated to FBC 8th Edition / ASCE 7-22 throughout. If you are working on a project permitted before the December 31, 2024 effective date and your local jurisdiction is still accepting FBC 7th Edition submittals, contact support — earlier code revisions are available for retrofit work.

Why Some Florida Counties Use Higher Wind Speeds

The ASCE 7-22 wind speed map is a national reference — a single map covering the entire United States. But Florida is not a uniform state. Several Florida counties have adopted local jurisdiction overrides that set design wind speeds higher than the baseline ASCE map would return, based on their own hurricane exposure data and post-storm forensic engineering.

The most important overrides:

Other Florida counties — Monroe (Keys), Lee, Charlotte, Sarasota, Manatee, Brevard, Volusia, Indian River, St. Lucie, Martin — generally follow the ASCE 7-22 baseline values for their location, with no further county override. The calculator handles all 67 Florida counties; the four above just happen to be the ones where ignoring the override produces a meaningfully wrong design pressure.

How to Calculate Your Florida Wind Load

Florida Wind Load FAQ

More Wind Load Resources