Gutters and downspouts
Splash block quantity calculator
Estimate splash block count. Surface discharge at downspouts.
Try the calculation
Count only outlets that you have selected for surface discharge and a splash block.
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
Splash block quantity matches selected surface-discharge outlets one for one.
Steps
- Enter the number of outlets that will discharge to a splash block.
- Count only the selected surface outlets.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
splash blocks = selected outlets.
Variables and units
- Selected surface-discharge outlets (outlets)
- Required. Zero is accepted. Use a whole number. Starting example: 4. Replace it for your task.
What the result means
The result is a part count, not a drainage design or grading check.
Worked example
Inputs: Selected surface-discharge outlets = 4.
Calculation: 4 selected outlets produce 4 splash blocks.
Result: 4 splash blocks.
Frequently asked questions
Can the count be zero?
Yes, when no surface outlet is selected.
Does it include downspout extensions?
No.
Does one block serve two outlets?
Count one block per selected outlet.