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Rafter Calculator

Updated Aug 9, 2026 100% Free Mobile Friendly

Rafter Calculator

Rafter Calculator

Calculate common rafter length, roof rise, pitch angle, and run from your roof dimensions.

Rafter Calculation

Common Rafter Length
Roof Rise
Roof Angle
Pitch

This calculator gives the geometric common-rafter length from the entered run and pitch. It does not include ridge-board deductions, overhangs, birdsmouth cuts, seat cuts, or local building-code requirements.

Free & instant results
Zain Bin Shabbir
Written by

Zain Bin Shabbir

Zain Bin Shabbir is a content creator and website publisher with 2 years of experience in SEO, web content, and practical online tools. He focuses on creating clear, useful, and user-friendly resources that simplify everyday calculations.