Rafter calculator

Calculate rafter length, count, and total timber for a simple gable roof.

Project settings

Calculate rafter length and estimate pairs and total timber for a simple gable roof.

Building width

Building length

Roof pitch

Horizontal overhang

Rafter spacing

Waste allowance

Half span

Roof rise

Run with overhang

Rafter length

Rafter pairs

Total rafters

Length with waste

Quantity estimate only: adapt the values to the product, the site, and the applicable technical rules.