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Rafter Length Calculator

Total building width

Typical overhang: 12-24 inches

Standard 2x lumber: 1.5 inches actual

Calculate precise rafter lengths including all cuts and measurements needed for proper installation. Our calculator provides total length, cutting angles, and layout measurements.

Cite this page as:

Daniel, P. Rafter Length Calculator. Available at: https://constructioncalculators.com/rafter-length-calculator/. Accessed: October 25, 2026.