FREE ONLINE CALCULATOR

Roof Pitch Calculator

Convert roof rise and run into pitch in 12, angle in degrees and slope length multiplier.

✓ Instant results ✓ Editable inputs ✓ Formula explained

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CONSTRUCTION · TOOLS

MEASURE Enter project dimensions

ESTIMATE Calculate material volume

PLAN Check practical assumptions

CALCULATION TOOL

Roof Pitch Calculator

Change any value and calculate again.

Uses the values you enter. No account required.

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ABOUT THIS TOOL

When to use a roof pitch calculator

Convert roof rise and run into pitch in 12, angle in degrees and slope length multiplier.

All assumptions are visible and adjustable. Check rates and underlying data against original sources before making a decision.

HOW IT WORKS

The calculation

Pitch = rise ÷ run × 12 (rise per 12); slope angle = atan(rise/run) in degrees; rafter multiplier = hypot(run,rise)/run.

Read the full guide →

ASSUMPTIONS

Know the limitations

Slope applies to a straight roof plane. Do not use for structural engineering or code verification.

Results are estimates derived from your inputs.