1. What is Roof Pitch?

Roof pitch is the steepness of a roof expressed as a ratio of vertical rise to horizontal run. It determines how quickly water runs off the roof and affects the roofing materials that can be used.

2. How to Calculate Roof Pitch

The calculator uses the roof pitch formula:

Where:

• Rise — Vertical height (in feet)
• Run — Horizontal distance (in feet)

Common Roof Pitches:

• Flat roof: 0.5:12 to 2:12
• Low slope: 2:12 to 4:12
• Conventional: 4:12 to 9:12
• Steep slope: 9:12 and above

3. Importance of Roof Pitch

Details: Roof pitch affects water drainage, snow load capacity, material choices, installation methods, and the overall aesthetic of a building.

4. Using the Calculator

Tips: Measure the vertical rise and horizontal run of your roof section. Enter both values in feet. The calculator will provide the pitch ratio, angle, and percentage grade.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between pitch and slope?
A: Pitch is the ratio of rise to run (e.g., 4:12), while slope is the ratio of rise to run expressed as a percentage.

Q2: How do I measure roof pitch without climbing?
A: You can measure from inside your attic - measure 12" horizontally from the edge, then measure vertically to the roof.

Q3: What pitch is best for my area?
A: Steeper pitches (6:12 or more) are better for snowy areas, while lower pitches work in dry climates.

Q4: Can I install any roofing material on any pitch?
A: No, materials have minimum pitch requirements (e.g., asphalt shingles need at least 2:12 with special underlayment).

Q5: How does pitch affect roof area?
A: Steeper pitches increase the actual surface area compared to the footprint area.