Metric Republic / Roof & Site Geometry / Roof Pitch Calculator

Roof Pitch Calculator

Convert roof rise and horizontal run into angle, slope percentage, pitch ratio and slope factor.

How it works

Convert roof rise and horizontal run into angle, slope percentage, pitch ratio and slope factor.

Core method:
Angle = atan(rise/run). Slope % = rise/run × 100. Slope factor = √(rise² + run²) / run.

Before you use the result: Check project drawings, supplier data and site conditions before ordering materials.

Practical use

Enter dimensions from the latest drawings or verified site measurements. Adjust allowances and material properties to the supplier or specification you are actually using. Results update instantly as inputs change.

Keep units consistent with the source information.
Use project-specific densities, pack sizes and coverage rates where provided.
Round purchasing quantities to supplier packaging and delivery rules.

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