Soffit Calculator: How Much Soffit Do I Need?

Soffits play a key role in keeping your house cool and preventing moisture buildup in your attic. Wondering, “How much soffit do I need?” Luckily, calculating how much soffit your project demands isn’t hard, but access might be tricky as soffits are along your roofline. That being said, use this soffit calculator to figure out exactly how much material you need. 

How Much Soffit Is Needed For Common Projects

Soffit installation is more of a science than an art, which makes calculating how much you need a little more straightforward. Measure length multiplied by width (depth) to arrive at the required amount of soffit. From there, you simply purchase and install that exact amount. Remember that soffit requirements are based on length, so even if your eaves are sloped, you measure flat against the soffit board. 

How to Calculate Soffit Requirements

Calculating the required amount of soffit is simple, as you’ll only need two numbers: the length and depth of your roof’s eaves. While you can use the measuring features on your smartphone, it’s more accurate to use a measuring tape. If you’re not comfortable on ladders, call a pro, as soffits are usually fairly high up (where the roof meets the exterior wall).

Use the formula below to calculate soffit requirements: 

Soffit amount required = Length (feet) x depth (inches)

If your length measurements do not correspond exactly to available soffit lengths, you’ll either need to purchase smaller pieces to fit the length or cut the soffit to fit (a pro should do this). Make sure you account for waste when cutting.  

How to Measure Soffits

Soffits can be purchased in standardized widths and are often done so, as custom soffit work isn’t overly common. Most soffits are between 8 inches and 12 inches wide, with common lengths measuring 6 feet, 8 feet, and 12 feet.

Who to Hire for Soffit Measurements and Installation

Measuring for soffits isn’t the most complicated task, but who do you call when you want a project quote or to begin installation? Roof repair professionals near you will be able to assist or direct any soffit-related work you plan on doing to your home. We recommend them over general contractors as their expertise with roof issues and access to soffit materials are second-to-none.   

How Much Does Soffit Installation Cost? 

Homeowners who need to replace the soffit around their entire home can expect to spend $2,550 on average, with a range between $1,625 and $3,500 (when installing vinyl). Metal and wood soffits are considerably more expensive and can cost between $2 and $25 per linear foot, whereas vinyl tops out around $12. 

The majority of soffit installation cost is from the installation itself—pros commonly charge between $40 and $120 per hour to perform this work. While this may seem high, remember the heights involved. Any work involving awkward positions with an element of danger will carry a premium.