Roof Pitch Calculator
Calculate roof pitch, roof angle and slope percentage from rise and run.
How to Use the Roof Pitch Calculator
Enter roof rise and run to calculate pitch, slope percentage and approximate roof angle.
Practical Example
A roof that rises 6 units for every 12 units of run has a 6:12 pitch and an angle of about 26.6 degrees.
Factors That Affect the Result
Measurement point, roof shape, framing method, overhangs and local roofing conventions can affect how pitch is reported and used.
Frequently Asked Questions
What does 6:12 mean?
The roof rises 6 units for every 12 units of horizontal run.
Is pitch the same as angle?
No. Pitch is a ratio, while angle is measured in degrees.
Can I use this for material estimates?
Yes as an input, but roof area and waste must also be considered.
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Roof Pitch Calculation Notes
Roof pitch describes how much the roof rises over a given horizontal run. Enter rise and run from the same section of roof and use consistent units. Pitch can be expressed as a ratio, percentage or angle, so choose the format that matches your plans or material specifications. Steeper roofs increase surface area and can affect drainage, roofing material choice and installation difficulty. For construction work, confirm the calculated pitch against measured framing dimensions before ordering materials.