๐งฑ Construction
Roof Pitch Calculator
Roof pitch is written as inches of rise per 12 inches of run, so a 6/12 roof climbs 6 inches for every foot. The pitch determines which roofing materials are allowed: most shingles need at least 4/12, and under that you need a membrane.
How it works
Rise
Run
Pitch (rise per 12 in)
Angle
Slope
Rafter multiplier
Rafter length for this run
Material note
Frequently asked questions
How do I use the Roof Pitch Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.