Calculator · Geometry & layout
Rafter Length Calculator
The free Rafter Length Calculator answers one question: Rafter length for a shed or gable roof. Enter your numbers in inches or millimeters and the result updates instantly in your browser, with no sign-up and no app to install. Use it on your phone at the bench, then copy or print the result for your cut list.
Run is half the building width. Pitch is inches of rise per 12 inches of run.
Rafter Length
- Rafter length (no overhang)
- 53.666″
- With overhang
- 67.082″
- Ridge height above wall
- 24″
- Plumb cut angle
- 26.6°
Pro tools · unlock
Which other geometry & layout calculators help with this project?
- Arc Radius Calculator — Radius from the chord width and arc height.
- Circle Calculator — Circumference and area for round tabletops.
- Roof Pitch & Angle Calculator — Pitch, angle and slope from rise and run.
- Diagonal & Squareness Calculator — Check a carcass or frame for square.
What you'll need for this project
Tools
Screws & hardware
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Build it · Advanced · 3–4 weekends
Download the complete plan with cut list and materials list (PDF)
8 × 10 ft Garden Shed — Full framing plan for an 8 × 10 ft gable shed with door and window. Drawings, cut list with board-foot totals, hardware list and step-by-step instructions.
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