How to Calculate Roof Pitch
Use rise and run to calculate a roof pitch ratio, slope percentage, and angle in degrees without making structural or code assumptions.
Read guideChoose the right roofing calculator
Estimate roof surface area, translate pitch, plan shingle bundles, convert roofing squares, or total gutter runs. Each tool explains its assumptions and keeps area calculations separate from structural or code decisions.
What are you measuring?
Roof area and pitch
Start with roof dimensions or determine slope from rise and run.
Shingle quantities and roofing squares
Convert measured area into common roofing ordering units.
Gutter runs
Plan linear gutter length and standard stock pieces by roof edge.
How to choose
Use the Roofing Calculator when you know horizontal roof dimensions and pitch and need surface area with waste. If rise and run are the measurements you have, the Roof Pitch Calculator reports the ratio, slope percentage, and angle.
After establishing area, use the Shingle Calculator to estimate bundles from a stated coverage rate, or the Roofing Squares Calculator for direct area conversion. The Gutter Calculator handles linear roof-edge runs and rounds each run to whole stock pieces, avoiding unrealistic reuse of offcuts between separate runs.
Measure with context
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