Trade calculators
Works in your browser. Nothing is uploaded.Roof pitch & slope
Turn a rise and run, an angle, a percent or a roof pitch into all the others, or work out the fall over a distance.
Type in any box. The others follow.
°
%
in 12
1 : n
Rafter factor
–
Rise per metre
–
Fall over the distance
–
In the other unit
–
How to use it
- Type what you know
A rise and run, an angle, a percent or a pitch like 6 in 12.
- Read the rest
Every other box and the drawing follow what you typed.
- Need a fall?
Fall over a distance gives the drop for a drain, a shower floor or a patio.
Tips
- Same units
Rise and run only need the same unit: inches, centimetres or bricks.
- Rafter length
Multiply the run by the rafter factor to get the length along the slope.
- Measure it
Lay your phone on the roof edge or a rafter and read the angle with the level.
In the app
Roof pitch & slope in Clinometer
- Lay the phone on it and read the pitch
- Ramps, stairs, ladders, drains and shower floors
- Checked against US, England or Australia rules
- Save checks to Records
Get it onGoogle PlayComing soon to the App Store
Roof pitch & slope guide ›