Gutters and downspouts
Gutter hanger calculator
Estimate hanger/bracket count. New gutter installation.
Try the calculation
Choose the spacing rule for the selected product.
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
Hanger count rounds a gutter run up by the selected spacing.
Steps
- Enter run length and hanger spacing in inches.
- Use the spacing rule for the selected product or layout.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
hangers = ceiling(length × 12 ÷ spacing).
Variables and units
- Run length (ft)
- Required. Use a positive value. Starting example: 95. Replace it for your task.
- Hanger spacing (in)
- Required. Use a positive value. Starting example: 24. Replace it for your task.
What the result means
It is a spacing-only estimate. End hooks, corners and snow or wind adjustments are outside the calculation.
Worked example
Inputs: Run length = 95; Hanger spacing = 24.
Calculation: 95 ft × 12 ÷ 24 in = 47.5, so 48 hangers.
Result: 48 hangers.
Frequently asked questions
Does it add end hangers?
No, it follows the current spacing formula.
Can spacing be 18 inches?
Yes, when that is the selected assumption.
Does a count prove structural adequacy?
No.