FREE ONLINE CALCULATOR

Roof Rafter Calculator

Calculate a gable roof rafter’s theoretical slope length including horizontal overhang.

✓ Instant results ✓ Editable inputs ✓ Formula explained

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CONSTRUCTION · TOOLS

MEASURE Enter project dimensions

ESTIMATE Calculate material volume

PLAN Check practical assumptions

CALCULATION TOOL

Roof Rafter Calculator

Change any value and calculate again.

Uses the values you enter. No account required.

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ABOUT THIS TOOL

When to use a roof rafter calculator

Calculate a gable roof rafter’s theoretical slope length including horizontal overhang.

All assumptions are visible and adjustable. Check rates and underlying data against original sources before making a decision.

HOW IT WORKS

The calculation

One rafter’s horizontal run = span/2 + overhang; roof rafter length = horizontal run × sqrt(1 + (pitch/12)^2).

Read the full guide →

ASSUMPTIONS

Know the limitations

Basic symmetrical gable roof with no ridge-board deduction, seat cut, heel height or structural framing requirements.

Results are estimates derived from your inputs.