Gutters and downspouts
Gutter length calculator
Measure total gutter length. New installation or replacement.
Try the calculation
Add each eave run receiving a gutter.
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
Gutter length is the sum of measured eave runs receiving gutter.
Steps
- Measure each run separately, enter up to three runs and leave unused optional rows blank.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
total length = run 1 + run 2 + run 3.
Variables and units
- Run 1 (ft)
- Required. Use a positive value. Starting example: 40. Replace it for your task.
- Run 2 (ft)
- Optional; blank contributes zero. Zero is accepted. Starting example: 35. Replace it for your task. Leave blank if unused.
- Run 3 (ft)
- Optional; blank contributes zero. Zero is accepted. Starting example: 20. Replace it for your task. Leave blank if unused.
What the result means
The total is measured footage. It does not infer corners, outlets or downspout locations.
Worked example
Inputs: Run 1 = 40; Run 2 = 35; Run 3 = 20.
Calculation: 40 ft + 35 ft + 20 ft = 95 linear ft.
Result: 95 linear ft.
Frequently asked questions
Should I include both sides of a corner?
Measure each installed run once.
Can a run be blank?
Yes, unused optional runs contribute zero.
Does this choose gutter stock lengths?
No, use the section calculator for that.