How To Determine The Pitch Of Your Roof

The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need.

How to determine the pitch of your roof.

A 12 12 pitch roof has a pitch angle of 45. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Before you calculate roof pitch you ll need to measure the slope of your roof. After measuring the slope estimate the roof pitch by dividing the slope by 2.

After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Place the end of your level the 0 inch point of your 12 marking against the roof surface. If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there. To convert between american roofing ratios and pitch degrees follow these steps.

Marvel at your mathematical. How to measure roof pitch. Find the inverse tangent of the pitch to find the angle in degrees. Hold the level straight and level bubble centered and then measure the vertical distance down from the your 12 mark on the level down to the roof.

Climb up on your roof. This is the amount your roof inclines in a 1 foot span or the pitch. Knowing the pitch of your roof is useful when designing an addition installing skylights or cutting new rake boards. Divide the first part of the ratio by 12 to work out the pitch.