French Drain Calculator

Estimate pipe, gravel, fabric, and excavation for your French drain project.

Drain Dimensions

Drain Length (ft) Total length of the drain

Trench Depth (in) Depth of the trench

Trench Width (in) Width of the trench

Pipe Diameter (in) Diameter of drain pipe

Gravel & Fabric

Gravel Type Type affects drainage

Fabric Wrap Prevents silt infiltration

Gravel Depth (in) Depth of gravel around pipe

Waste Factor Add waste for settling

Gravel 0.0 tons

Pipe 0 ft

Fabric 0 ft²

Excavation 0.0 yd³

Gravel Volume 0.0 ft³

Pipe Length 0 ft

Fabric Width 0 ft

Gravel Type 3/4" Stone selected

Slope Needed 1/8" per ft minimum slope

Total Cost $0 approx. materials

Maintain 1/8" to 1/4" slope per foot for proper drainage

Gravel weight ≈ 1.4 tons per cubic yard Excavation = Length × Width × Depth / 27 (yd³)