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Calcimator

Roof Pitch Calculator

Calculate roof pitch in degrees and percentage from rise and run measurements. Determine roof type and rafter length.

Inputs

inches
inches

Results

Pitch Ratio

6/12

Pitch (Degrees)26.57°
Pitch (Percent)50%
Roof TypeConventional
Rafter Length (per foot of run)13.42 in

Pitch Ratio

6/12

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Rise — Vertical height the roof rises over a 12-inch horizontal span Accepts values from 0 inches to 48 inches (default: 6 inches).
  3. Run — Horizontal distance measured — typically 12 inches for standard pitch notation Accepts values from 1 inches to 48 inches (default: 12 inches).
  4. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  5. Pitch Ratio — your calculated result. This is the primary result of this calculator.
  6. Pitch (Degrees) — shown as a numeric value.
  7. Pitch (Percent) — shown as a numeric value.
  8. Roof Type — your calculated result.
  9. Rafter Length (per foot of run) — shown as a numeric value.
  10. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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