Rise run pitch where pitch is expressed in percent. A roofs pitch is determined by how much it rises vertically for every foot. The metal roof length calculator calculates the distance from peak to trim so add the length you want the roof metal to extend beyond the eave trim.
The way pitch also known as roof slope is measured is rise over run.
How do you calculate the slope of a roof. The most precise way to find the roofs slope is by measuring it from the underside. For a roof slope expressed as X-in-12 rise-in-run the hip and valley factor is determined by finding the square root of riserun² 2 for the slope of the adjacent roof sections. How to calculate roof pitch.