Roof & Gutter Issues
Gutters overflow, downspouts can't keep up, or roof drainage needs sizing.
4 calculators recommended for this problem
Recommended Calculators
These tools are most useful for solving "roof & gutter issues" problems.
Roof Rainfall Demand Calculator
Enter roof area, rainfall intensity and drain count to calculate total and per-drain rainfall flow. Use manufacturer flow-versus-head data for drain selection and capacity checks.
Downspout Sizing Calculator
Enter roof area and rainfall intensity to select round or rectangular downspout sizes from IPC sizing tables.
Gutter Flow Calculator
Enter gutter shape, dimensions, slope, and roughness to calculate flow capacity, velocity, hydraulic radius, and Froude number with Manning's equation.
Rational Method Calculator
Enter runoff coefficient, rainfall intensity, drainage area, and return period to calculate Rational Method peak discharge (Q = CiA), adjusted C, and a transparent calculation breakdown.
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