Calculate exactly how many metal panels, screws, and materials you need for your standing seam or corrugated roof project.
Installing a metal roof is one of the best investments you can make for your home, but ordering the wrong amount of panels or screws can cause massive delays. Unlike asphalt shingles that come in "squares," metal roofing is calculated by the linear foot and panel width.
Our metal roof panel calculator takes your roof's footprint, applies the correct pitch multiplier, and divides it by the exact exposure width of your chosen metal panels to tell you exactly how many sheets to buy.
The most common question DIYers have is how to calculate screws for metal roofing. The general rule of thumb for metal roofing screws (with neoprene washers) is:
Our calculator automatically calculates the total square footage of your roof and multiplies it by 1.2 to give you the exact number of screws needed, including a 20% buffer for side-laps, eaves, ridges, and mistakes.
One of the biggest advantages of metal roofing is that it can be installed on much lower slopes than asphalt shingles. However, you must follow the manufacturer's guidelines to prevent leaks:
The cost of a metal roof varies wildly based on the type of metal and the finish. On average, expect to pay:
Use the "Material Cost per Sq Ft" input in our calculator above to get an accurate estimate for your specific project.
Yes, absolutely. You should always install a high-quality synthetic roofing underlayment (or at least #30 felt paper) over the roof decking before installing metal panels. This provides a secondary water barrier and prevents condensation from dripping onto your wood decking.
A hip roof requires more cutting and waste than a standard gable roof. Calculate your total adjusted square footage using our calculator, and then add an extra 15% waste factor to your panel order to account for the complex hip and valley cuts.
In many jurisdictions, you can install a metal roof directly over one layer of existing asphalt shingles (known as a "re-roof"). However, you must install wooden strapping (battens) horizontally over the shingles first to create a flat, ventilated surface for the metal panels to attach to. Always check your local building codes first.