---
title: Ventilation Calculator for Professionals | DECRA Metal Roofing
description: Use this calculator to know how many panel vents you need to provide proper attic ventilation to balance air intake & exhaust under US FHA 1/300 rules.
---

- [ Blog ](https://www.decra.com/blog)
  
  Enter your email address and zip code to find contractors in your area
- [ Gallery ](https://www.decra.com/metal-roofing-gallery)
  
  Enter your email address and zip code to find contractors in your area
- [ For Professionals ](https://www.decra.com/pro)
  
  Enter your email address and zip code to find contractors in your area
- Find Contractor
  
  Enter your email address and zip code to find contractors in your area
- [ (877) 463-3272 ](tel:8774633272)
  
  Enter your email address and zip code to find contractors in your area

<https://www.decra.com>

- [ METAL TILE ROOFING ](https://www.decra.com/metal-tile-roofing)
- [ METAL SHINGLE ROOFING ](https://www.decra.com/metal-shingle-roofing)
- [ METAL SHAKE ROOFING ](https://www.decra.com/metal-shake-roofing)

- QUICK LINKS
- [Design Your Roof](https://www.decra.com/design)
- [Request Sample and Estimate](https://www.decra.com/request-sample)
- [Metal Roofing Blog](https://www.decra.com/blog)
- [Metal Roofing Myths](https://www.decra.com/metal-roofing-myths)

* Menu *

* Menu *

- HOMEOWNERS 
    - [ Request Sample and Estimate ](https://www.decra.com/request-sample)
    - [ See DECRA on Your Home ](https://www.decra.com/design)
    - [ Register Warranty ](https://www.decra.com/register-warranty)
- PROFESSIONALS 
    - [ Join Contractor Network ](https://www.decra.com/join-contractor-network)
    - [ Visit Knowledge Base ](https://www.decra.com/pro)
    - [ Ventilation Calculator ](https://www.decra.com/ventilation-calculator)
- Resources 
    - [ Blog ](https://www.decra.com/blog)
    - [ Gallery ](https://www.decra.com/metal-roofing-gallery)
    - [ Case Studies ](https://www.decra.com/case-studies)
    - [ Metal Roofing Myths ](https://www.decra.com/metal-roofing-myths)

- [ 1230 Railroad St, Corona, CA 92882 ](https://www.google.com/maps/place/1230+Railroad+St,+Corona,+CA+92882/@33.8877827,-117.5875414,17z/data=!3m1!4b1!4m5!3m4!1s0x80dcc85b2843c881:0xde8667dc4e01a741!8m2!3d33.8877827!4d-117.5853527)
- [ (877) 463-3272 ](tel:8774633272)

[![Request Call](https://no-cache.hubspot.com/cta/default/5712265/09a36b95-b407-4c8b-934b-39d40abbba7b.png)](https://cta-redirect.hubspot.com/cta/redirect/5712265/09a36b95-b407-4c8b-934b-39d40abbba7b)

- <https://www.facebook.com/DECRAMetalRoofing>
- <https://www.instagram.com/decrametalroofing/>
- <https://www.linkedin.com/company/decrametalroofing/>
- <https://www.youtube.com/channel/UCTaeKaQ-mbHxenZkyHY1S2w>
- <https://www.pinterest.com/decrametalroofing/>

# VENTILATION CALCULATOR

## Calculate How Many Panel Vents You Need

## CALCULATION BASED ON U.S. FHA 1/300 GUIDELINES

Proper attic ventilation consists of a balance between air intake and air exhaust.

The U.S. Federal Housing Authority recommends a minimum of at least 1 sq. ft. of attic ventilation (split between intake and exhaust) for every 300 sq. ft. of attic floor space.

Use this calculator to help determine the proper amount of air exhaust panel vent attic ventilation based on U.S. FHA 1/300 guidelines.

To calculate the total square feet, measure the length and width of the attic floor space to be ventilated.

## Ventilation Calculator

Enter the Total Square Feet of Attic Space

CALCULATE

## Panel Vents / Packages Needed

DECRA Shingle XD, Shake XD, Tile, Shake and Shingle Plus Panel Vent(s) needed

 

DECRA Villa Tile - Panel Vent(s) needed

 

DECRA Ridge Vent Package(s) needed

 

## Want to Talk to a DECRA Consultant?

Get a call from a DECRA rep in your area.

[![REQUEST CALL](https://no-cache.hubspot.com/cta/default/5712265/723d81ff-f8d7-4a3f-a61c-5c6d7c514c7a.png)](https://cta-redirect.hubspot.com/cta/redirect/5712265/723d81ff-f8d7-4a3f-a61c-5c6d7c514c7a)

<https://www.decra.com/ventilation-calculator#top-section>

Help us improve your experience. [ Send feedback ![image](https://www.decra.com/hubfs/decra-open-link.svg) ](https://www.decra.com/feedback-survey)

- [Privacy Policy](https://www.decra.com/privacy)
- [Contact Us](https://www.decra.com/contact-us)
- [Register Warranty](https://www.decra.com/register-warranty)
- [Claims*](https://www.decra.com/claims)

- © 2026 DECRA Roofing Systems, Inc.
- All rights reserved

 Cookie Settings

```json
{
  "@context" : "https://schema.org/",
  "@type" : "Organization",
  "address" : {
    "@type" : "PostalAddress",
    "addressCountry" : "USA",
    "addressLocality" : "Corona",
    "addressRegion" : "California",
    "postalCode" : "92882",
    "streetAddress" : "1230 Railroad St.",
    "telephone" : "(877) 463-3272"
  },
  "description" : "DECRA Metal Roofing is a manufacturer of Stone Coated Metal Roofing products. We have been in business since 1957 and are the inventors of Stone Coated Steel Roofing Material Category.",
  "founder" : {
    "@type" : "Person",
    "image" : "https://www.aucklandmuseum.com/war-memorial/online-cenotaph/record/C141047",
    "jobTitle" : "Founder",
    "name" : "L. J. Fisher",
    "url" : "https://www.aucklandmuseum.com/war-memorial/online-cenotaph/record/C141047"
  },
  "foundingDate" : "1957",
  "foundingLocation" : {
    "@type" : "Place",
    "name" : "New Zealand"
  },
  "image" : "https://decra.com/hubfs/decra-metal-roofing-web-villa-tile-hero-3-1.webp",
  "legalName" : "DECRA Roofing Systems, Inc.",
  "logo" : "https://decra.com/hubfs/Decra%20Logo-1.svg",
  "name" : "DECRA Metal Roofing",
  "sameAs" : [ "https://twitter.com/DECRAMetalRoof", "https://www.linkedin.com/company/decrametalroofing/", "https://www.instagram.com/decrametalroofing/", "https://www.facebook.com/DECRAMetalRoofing" ],
  "telephone" : "(877) 463-3272",
  "url" : "https://www.decra.com/"
}
```