Convert roof pitch between x:12 pitch, degrees, percent grade, rise over run, inches per foot, and slope ratio for roofing, framing, drainage, construction layout, and estimating.
Pitch to slope ratio:
slope ratio = pitch ÷ 12
Pitch to percent grade:
percent grade = pitch ÷ 12 × 100
Pitch to degrees:
degrees = arctan(pitch ÷ 12)
Degrees to pitch:
pitch = tan(degrees) × 12
Pitch conversions are useful for roofing, rafters, framing, roof takeoffs, shingles, metal roofing, roof slope labels, attic planning, shed roofs, porch roofs, and construction layout.
Use this converter when switching between roof pitch, slope angle, percent grade, and rise-over-run measurements.
Your result shows the entered pitch converted from the starting unit into the selected ending unit. The converter also shows common references such as roof pitch, degrees, percent grade, inches per foot, and rise-over-run ratio.
This converter changes pitch units only. For roof design, framing, drainage, or code-sensitive work, confirm the required pitch with local code, plans, product requirements, or project specifications.
A 4:12 pitch means the roof rises 4 inches for every 12 inches of horizontal run.
A 4:12 roof pitch is about 18.43 degrees.
A 6:12 roof pitch equals a 50% grade because 6 divided by 12 equals 0.5.
A 45 degree roof angle equals a 12:12 pitch.
They are closely related. Pitch usually refers to roof rise over 12 inches of run, while slope is the general rise-over-run relationship.