How do I convert roof pitch to degrees?

Use the formula degrees = arctan(rise ÷ 12). For a 6:12 pitch: arctan(0.5) = 26.57°. This calculator does it instantly for any pitch from 1:12 to 24:12.

What is a pitch multiplier?

The pitch multiplier is √(rise² + 144) ÷ 12. Multiply your roof footprint area by this number to get the true sloped surface area — what you actually need to order material for.

What is the most common roof pitch?

The most common residential roof pitch is 6:12 (26.57°), followed by 4:12 and 5:12. Pitches between 4:12 and 8:12 are considered conventional slope.

Free Tool

Roof Pitch Calculator

Convert any roof pitch to degrees, calculate the pitch multiplier, and estimate true sloped area from your footprint.

Roof Pitch (rise : 12) 6 : 12

1:12 (nearly flat)12:12 (45°)24:12 (gothic)

Degrees

26.57°

Pitch Multiplier

1.118

Classification

Conventional

Footprint area (sq ft) 2,000 sq ft

200 sq ft10,000 sq ft

True sloped surface area: 2,236 sq ft

Roofing squares needed: 22.4 squares

Bundles (3 per square, no waste): 67.1 bundles

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