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Convert rise and run into roof pitch, angle, rafter factor, and slope length for quick roof planning.
Roof measurements
Enter the vertical rise and horizontal run in the same units. Add the full span to estimate one sloped side.
Pitch result
Roof pitch
6/12
50% · 26.565°
Rafter factor
1.11803
One-side slope length
13.416 ft
A rise of 6 over a run of 12 produces a 50% slope. Use the Rafter Calculator for complete framing cuts and lumber details.
Converts a roof's vertical rise and horizontal run into a pitch ratio, percentage slope, angle in degrees, rafter factor, and estimated slope length.
Homeowners, roofers, framers, estimators, and DIY builders checking a roof measurement before ordering materials or cutting rafters.
Enter rise and run in the same unit. The calculator divides rise by run, converts the result to a percentage and angle, and uses the total span to estimate the sloped length of one side.
This is a geometry planning tool. It does not verify structural loads, code compliance, drainage requirements, or the final dimensions of a complex roof.
A 6/12 pitch rises 6 inches for every 12 inches of horizontal run. It is a 50% slope and an angle of about 26.565 degrees.
No. Pitch is commonly written as rise over a 12-inch run, while angle is the geometric angle between the roof surface and the horizontal plane.
Yes, when you enter a total span. It estimates one sloped side using half the span and the rafter factor; use the Rafter Calculator for complete cuts and framing details.
No. It only describes roof geometry and should not be used as structural, code, or safety advice.
Quick jumps
Home
Convert rise and run into roof pitch, angle, rafter factor, and slope length for quick roof planning.
Roof measurements
Enter the vertical rise and horizontal run in the same units. Add the full span to estimate one sloped side.
Pitch result
Roof pitch
6/12
50% · 26.565°
Rafter factor
1.11803
One-side slope length
13.416 ft
A rise of 6 over a run of 12 produces a 50% slope. Use the Rafter Calculator for complete framing cuts and lumber details.
Converts a roof's vertical rise and horizontal run into a pitch ratio, percentage slope, angle in degrees, rafter factor, and estimated slope length.
Homeowners, roofers, framers, estimators, and DIY builders checking a roof measurement before ordering materials or cutting rafters.
Enter rise and run in the same unit. The calculator divides rise by run, converts the result to a percentage and angle, and uses the total span to estimate the sloped length of one side.
This is a geometry planning tool. It does not verify structural loads, code compliance, drainage requirements, or the final dimensions of a complex roof.
A 6/12 pitch rises 6 inches for every 12 inches of horizontal run. It is a 50% slope and an angle of about 26.565 degrees.
No. Pitch is commonly written as rise over a 12-inch run, while angle is the geometric angle between the roof surface and the horizontal plane.
Yes, when you enter a total span. It estimates one sloped side using half the span and the rafter factor; use the Rafter Calculator for complete cuts and framing details.
No. It only describes roof geometry and should not be used as structural, code, or safety advice.
Quick jumps