Rafter Length Calculator
Calculate rafter length, rise, run, and angle using the Pythagorean theorem.
Roof Dimensions
Horizontal distance from wall to ridge
Vertical height from top of wall to ridge
Rise in inches per foot of run
Eave extension beyond wall
Options
Display units
Add waste for cuts
Price per foot of lumber
Rafter Length
0.00
ft
Angle
0.0
°
Total Rise
0.00
ft
Run
0.00 ft
Rise
0.00 ft
Overhang
0.00 ft
Pitch
0.0/12
Total Length (w/waste)
0.00 ft
Total Cost
$0
Slope
0.0
%
Roof Area (per side)
0.0
ft²
Board Feet
0.0
bd ft
Rafter Length = √(Run² + Rise²). Add overhang for total rafter length.
Rafter Length = √(Run² + Rise²)
Pitch = (Rise / Run) × 12