Drain Slope Calculator (1/4 per Foot)

What is the total drop for a 1/4 per foot pipe slope over 50 feet?

At 1/4 inch per foot, a 50-foot run drops 50 × 0.25 = 12.5 inches total. That is a steady 2% grade end to end — keep it uniform rather than dropping fast then running flat, or solids can settle where the slope flattens.

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