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Roof Pitch Calculator

Convert measured rise and run among pitch ratio, slope percentage, and angle.

Published

Pitch ratio
Pitch ratio
6:12
Angle
26.57°
Slope
50.0%

Geometry only; material limits, drainage requirements, access, and code compliance are outside this calculation.

Calculation method
Vertical distance the roof rises
in
Horizontal distance the roof spans
in

Results update as you type.

Roof Pitch Calculator

Convert measured rise and run among pitch ratio, slope percentage, and angle.

Inputs and method

Enter rise and run, angle, or slope percentage. The calculator converts among rise/run, arctangent angle, and 100 × rise ÷ run while retaining precision until the displayed digits are rounded.

Calculations retain full floating-point precision until the labeled display step. Counts and packages use an explicit upward ceiling only where a whole purchase unit is required.

Interpreting the estimate

Use the result as a planning value and keep input precision consistent with the measurements or source data you have. Small displayed differences can come from final-place rounding; intermediate values are not rounded.

Assumptions and limits

The output is geometry only. It does not determine roof-covering suitability, drainage design, structural capacity, access safety, or code compliance.

Empty entries, invalid numbers, prohibited negatives, zero denominators, impossible relationships, and unsupported options trigger a validation message instead of a misleading result.

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Roof Pitch Calculator updated at