basic

Gable Roof Surface Area Calculator

Area = 2 · ridge · √(rise² + run²).

Compute the total roof surface area of a simple gable (two-pitch) roof from the ridge length, the horizontal half-span (run), and the rise from eave to ridge: A = 2 · ridge · √(rise² + run²).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

ft
ft
ft

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

A = 2 · ridge · √(rise² + run²)

In depth

Compute the total roof surface area of a simple gable (two-pitch) roof from the ridge length, the horizontal half-span (run), and the rise from eave to ridge: A = 2 · ridge · √(rise² + run²).