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Roof Pitch Calculator
Convert roof rise and run into pitch, angle, slope percentage, slope factor, and optional sloped roof area with waste allowance.
ROOFING
LOCAL
NO DATA SENT
ROOF PITCH CALCULATORRISE / RUN / ANGLE / SLOPE FACTOR
PITCHENTER RISE AND RUN
A 6:12 roof rises 6 inches for every 12 inches of horizontal run. The optional area input uses the slope factor to estimate sloped surface area from horizontal plan area.
ANGLE—
SLOPE %—
SLOPE FACTOR—
SLOPED AREA—
AREA + WASTE—
HOW IT WORKSTRIGONOMETRY BEHIND PITCH
READYEnter rise and run to calculate roof pitch.
PLANNING TOOL: Measurements stay in your browser. This calculator covers basic roof geometry only. Roof structure, loading, drainage, material restrictions, fall protection, flashing, code requirements, and installation details need separate professional review.
FIELD NOTE / 080
Roof pitch is the vertical rise compared with horizontal run.
The angle is arctangent(rise ÷ run). The slope factor is √(rise² + run²) ÷ run, which converts a horizontal plan area into an estimated sloped surface area for a simple roof plane.