After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof.
How do you measure the pitch of your roof.
However if you have a more complex roof you.
Here s an easy safe way to determine the pitch from inside your attic.
How to measure roof pitch.
Knowing the pitch of your roof is useful when designing an addition installing skylights or cutting new rake boards.
Placing a ladder near the roof you will put a level a foot or so up on the roof hold it level and measure from the 12 inch mark straight down.
Using ruler and tape you can do it anyway of these ways.
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.