Gutters and downspouts
Gutter slope/drop calculator
Calculate gutter slope drop. New gutter run.
Try the calculation
Calculate the fall along one gutter run.
Adjustable example. Change these illustrative inputs to match your task, then recalculate. Reset restores the example and its result.
Understand the result
How this calculation works
Slope drop is the vertical fall across one gutter run.
Steps
- Enter the run length and the selected slope in inches per foot.
- Keep the slope as an arithmetic input.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
drop = run length × slope.
Variables and units
- Run length (ft)
- Required. Use a positive value. Starting example: 40. Replace it for your task.
- Slope (in per ft)
- Required. Use a positive value. Starting example: 0.0625. Replace it for your task.
What the result means
The page calculates the entered slope. The example slope is not a universal installation recommendation.
Worked example
Inputs: Run length = 40; Slope = 0.0625.
Calculation: 40 ft × 0.0625 in/ft = 2.5 in of fall.
Result: 2.5 in drop.
Frequently asked questions
Does it choose a minimum slope?
No.
Can the run be longer?
Yes, if the project condition fits the entered model.
Does drop include outlet placement?
No, it is only the end-to-end fall.