Rise Over Run Calculator
Find the slope from the rise and run (or two points) as a fraction, decimal, angle and percent grade.
Change the values and press Calculate to work out your own figures.
From rise and run
Enter the rise and the run.
Show the working
- slope = rise ÷ run; angle = arctan(slope); grade = slope × 100%
From two points
Enter two points.
Show the working
- slope = rise ÷ run; angle = arctan(slope); grade = slope × 100%
How to use it
Enter the rise and the run. Enter two points.
Enter coordinates as whole numbers, decimals or fractions (3/4). Show the working gives the formula with your numbers.
Key facts
slope = rise ÷ run
Roof pitch and ramps
A 3-in-12 roof has a slope of 1/4 (14.04°, 25%); an accessible ramp is at most 1 : 12.
Questions
What slope is 3 over 12?
1/4 = 0.25, 14.03624347°, 25%.
What about a run of 0?
A vertical line: no slope.
Formulas
slope = rise ÷ run
Sources
Limitations
- Vectors have two or three components (leave z blank for 2-D).
- Earth distances assume the WGS 84 ellipsoid (sea level).