Gutters and downspouts
Gutter end-cap calculator
Estimate end caps. Gutter run takeoff.
Try the calculation
Count the open ends of each 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
End caps are counted from open gutter-run ends.
Steps
- Enter the number of open-ended runs.
- Count the physical runs in the layout.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
end caps = 2 × runs.
Variables and units
- Open-ended runs (runs)
- Required. Use a positive value. Use a whole number. Starting example: 3. Replace it for your task.
What the result means
The result assumes two capped ends per entered run. It does not classify outlets or corners.
Worked example
Inputs: Open-ended runs = 3.
Calculation: 3 open-ended runs × 2 = 6 end caps.
Result: 6 end caps.
Frequently asked questions
What if a run has only one capped end?
This two-end model does not fit it; count the caps manually rather than entering a fractional run.
Can runs be zero?
No. This page requires a positive whole-run count.
Does it include inside or outside corners?
No.