Utility
Roof Pitch Calculator
Easily calculate roof pitch, angle, rafter length, and more with our free online Roof Pitch Calculator. Perfect for roofing professionals and DIYers.
Roof Pitch Calculator
Results
Pitch Ratio (Rise/Run) -
Angle (Degrees) -
Percentage Grade -
Multiplier factor -
FAQ
Frequently asked questions
What is roof pitch?
Roof pitch is the steepness or slope of a roof, usually expressed as a ratio of the vertical rise to the horizontal run (e.g., 4/12).
How do I calculate roof pitch?
Measure the vertical rise in inches over a 12-inch horizontal distance (the run). The ratio of rise over run is your roof pitch.
What is a standard roof pitch?
Standard roof pitches range from 4/12 to 9/12, which are common in residential construction and considered safe for most roofing materials.
Why is roof pitch important?
Roof pitch affects water drainage, the type of roofing materials you can use, snow load capacity, and the overall aesthetic of the building.
How do I convert roof pitch to degrees?
To convert pitch to degrees, divide the rise by the run, calculate the arctangent (inverse tangent) of the result, and convert from radians to degrees.
What is a flat roof vs. a pitched roof?
A flat roof has a pitch less than 2/12, while a pitched roof has a pitch of 2/12 or greater. Flat roofs require special sealing to prevent pooling water.
How does roof pitch impact solar panel installation?
The pitch determines the angle of the solar panels relative to the sun. An optimal pitch maximizes energy capture. Panels on flat roofs usually need angled mounting racks.
Related tools
All calculators →Date Difference Calculator
Calculate the gap between two dates in years, months, days, weeks, hours, and business days.
Open
Time Zone Converter
Convert any time across 25+ major cities worldwide — DST and offsets handled automatically.
Open
Word Counter
Count words, characters, sentences, paragraphs, and estimate reading time instantly.
Open