CALCULATORROOF-PITCH-MULTIPLIER-CALCULATCALCULATE · DECIDE · ACT
Roofing Calculators · reviewed September 1, 2026
Roof Pitch Multiplier Calculator
Convert a roof pitch such as 4/12, 6/12, or 12/12 into the slope multiplier used to turn horizontal footprint area into sloped roof area.
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Enter your measurements and calculate.
Enter your measurements and calculate.
Worked example
Example
A 6/12 pitch has a multiplier of about 1.118 and an angle of about 26.6 degrees.
References
Sources & assumptions
Last reviewed September 1, 2026. Defaults are starting points; product-specific inputs are editable wherever coverage varies.
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FAQ
Common questions
What is the multiplier for a 6/12 roof?
Approximately 1.118.
What is a 12/12 roof angle?
45 degrees.
What do I multiply by the pitch factor?
Multiply the horizontal projected area by the factor to estimate sloped surface area on a simple roof.