Roof Area Calculator

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Calculate sloped roof area from plan dimensions and rise.

RoofingWorking calculatorMobile friendly

Roof Area CalculatorVisual reference for this tool.

Use this calculator for quick estimating and planning. Verify project-specific assumptions before final procurement or design.

Building Length (m)

Half Span (m)

Rise (m)

Number of Slopes (nos)

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Calculations run locally in your browser; no backend is required.

Slope Length = √(Half Span² + Rise²); Roof Area = Length × Slope Length × Number of Slopes

For half span 4 m and rise 1.5 m, slope length is about 4.27 m.

For structural, electrical, code-compliance or safety-critical work, use this as a preliminary estimate and verify with a qualified professional.

Short answers for common estimation questions.

They are estimation values. Site conditions, product specifications and local practice can change final quantities.

Yes. Civil Micros is designed to work on mobile browsers without a backend.

Continue your calculation workflow.