Civil & Construction
Civil & Construction
Civil and earthwork calculators.
CV
NewCulvert Size Calculator
Size a round culvert with Manning's equation. Get the full-flow capacity in cfs and velocity for a diameter, or the minimum standard pipe size for a design flow — concrete, CMP, or HDPE. Free, no sign-up.
Civil & Construction
CV
NewRational Method Calculator
Estimate peak stormwater runoff with the Rational Method, Q = C·i·A. Build a weighted runoff coefficient from multiple surfaces, enter the rainfall intensity and area, and get the peak flow in cfs. Free, no sign-up.
Civil & Construction
CV
NewCut and Fill Calculator
Calculate cut and fill earthwork volume with the average end area method. Enter cross-section areas along the alignment to get total cut, fill, and the net import or export in cubic yards. Free, no sign-up.
Civil & Construction