Measure Roof Pitch From the Ground
No ladder, no climbing. Take a photo from the ground and use simple geometry to estimate your roof pitch — safe and good enough for most needs.
⚠️ Accuracy note: Ground-based measurement is an approximation (±1 pitch unit). For permits, construction, or material orders, use the roof or attic method for exact measurements.
Method A: Photo Method
- 1. Stand directly in front of the gable end (the triangular wall side of your home) at least 20 feet back.
- 2. Take a photo of the roof peak, holding your phone level (use the grid overlay to check).
- 3. Open the photo in any image editor or your phone's gallery.
- 4. Measure the vertical rise and horizontal run of the triangle in pixels using a ruler tool or by counting grid squares.
- 5. The ratio stays the same regardless of image size: rise/run in pixels = actual pitch. Convert to X/12 format.
Method B: Protractor App
- 1. Download a free protractor or angle measurement app (most phones have one built in).
- 2. Stand at the side of the house where you can see the roof slope clearly.
- 3. Hold your phone up so the screen edge aligns visually with the roof slope.
- 4. Read the angle in degrees from the app.
- 5. Enter the angle into our pitch calculator to convert to X/12 format.
Method C: Visual Estimate
Experienced roofers can estimate pitch by eye. Here are reference points:
3/12
Very shallow — looks almost flat from the ground
6/12
Moderate — the most common residential look
8/12
Noticeably steep — colonial and traditional
12/12
Dramatic 45° — looks like a capital A from the side