–Degrees
–Pitch ratio
–mm / m
Measure horizontal run and vertical rise over the same section. Any matching units work.
Locked
0.0°
Tap start, then lay the phone flat on the slope with the top of the phone pointing up the roof.
– m²
Enter footprint and pitch for a sloped-area estimate.
Assumes a simple gable or mono-pitch over the full footprint (plan area ÷ cos pitch). Hips, valleys, dormers and overhangs will change the real figure — always confirm with a site measure.
Suitable
Too flat
Minimum pitches are typical New Zealand figures (NZBC E2/AS1 and common manufacturer specs) and are a guide only. Always confirm against the current E2/AS1 tables and the manufacturer's installation requirements.