Excavation & Sitework Calculators

Free, no-signup tools for the math dirt work contractors run every day: concrete yardage, pipe fall percentage, material weight, and stormwater peak discharge. Bookmark this page for easy access in the field.

Basic Concrete Calculator

Calculate cubic yards of concrete needed from length, width, and depth.

Concrete Bags & Cost

Estimate the number of concrete bags needed and total material cost for a pour.

Percent of Fall

Calculate pipe slope percentage from invert elevations and run length for underground utility installs.

Material Weight

Estimate the total weight of gravel, sand, asphalt, concrete, or soil from a given volume.

Rational Method (Peak Discharge)

Estimate peak stormwater discharge for drainage design and erosion control planning using the Rational Method (Q = CIA).

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