Roof Pitch Calculator
Find your roof pitch angle and ratio.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator converts a roof's rise and run into its pitch ratio (e.g. 6:12), angle in degrees, and rafter length multiplier — the pitch ratio expresses how many inches the roof rises for every 12 inches of horizontal run, the standard way roofing is specified in the US.
Roofers and contractors use it to order the right amount of roofing material (steeper pitches need more material per square foot of footprint) and to select fasteners and shingles rated for that slope, while DIYers building a shed or extension use it to figure out rafter lengths before cutting lumber.
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