Convert slope between percent grade, degrees, rise over run, ratio, inches per foot, feet per foot, and roof pitch for construction, drainage, ramps, roofs, grading, and site layout.
Percent grade to feet per foot:
feet per foot = percent grade ÷ 100
Percent grade to inches per foot:
inches per foot = percent grade × 0.12
Inches per foot to percent grade:
percent grade = inches per foot × 8.3333
Degrees to percent grade:
percent grade = tan(degrees) × 100
Slope conversions are useful for drainage pipe slope, sewer slope, ramp slope, driveway grade, roof pitch, site grading, landscaping, sidewalks, patios, concrete slabs, and construction layout.
Use this converter when switching between grade, angle, pitch, rise/run, and construction slope references.
Your result shows the entered slope converted from the starting unit into the selected ending unit. The converter also shows common references such as percent grade, degrees, inches per foot, feet per foot, and roof pitch.
This converter changes slope units only. For code-sensitive work such as ramps, stairs, drainage, roofs, or sewer lines, always confirm the required slope with local code, plans, or project specifications.
Divide percent grade by 100, then take the arctangent. For example, a 10% grade is about 5.71 degrees.
Multiply inches per foot by 8.3333. For example, 1/4 inch per foot equals about 2.0833% grade.
A 2% slope means 2 units of rise or fall for every 100 units of horizontal run. It also equals 0.24 inches per foot.
A 4:12 roof pitch is about 18.43 degrees.
They are related. Slope is the general rise-over-run relationship. Pitch is often used for roofs and is commonly written as inches of rise per 12 inches of run.