French Drain Calculator

Sizes stone, pipe and filter fabric for a trench, plus fall and depth at the outlet. Imperial/metric, free, no signup.

Free

French Drain Calculator website

About

Free French drain calculator for drainage trenches. Estimates stone, pipe and filter fabric quantities, and helps with fall and outlet depth. Supports imperial and metric. Aimed at homeowners and landscapers planning a drain run—not a licensed engineering stamp. Free, no sign-up.

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