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tool.gutter-sizing Calculator
Calculates minimum gutter width and downspout count from roof catchment area and design rainfall intensity. A 5-inch K-style gutter handles about 5,300 sq ft of roof at standard slopes — undersized gutters overflow during heavy rain.
Inputs
Roof Area Sqft
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Rainfall Intensity
Reference formula or conversion factor shown for context.
Slope Pct
Reference formula or conversion factor shown for context.
Results
design flow (GPM)
Sample size or count used in the calculation.
min gutter size (approx in)
Sample size or count used in the calculation.
recommended size
Sample size or count used in the calculation.
downspout area (1 per)
The computed two-dimensional surface area.
slope
The gradient -- rise divided by run. In finance, rate of change per unit time.