Construction Calculators
Every HomeBuild Atlas calculator is free, requires no sign-up, documents its formulas, and includes a worked example, a common-values table, a downloadable PDF report of your results, and honest guidance on when the job needs a licensed professional. Pick the tool that matches your project:
ConcreteConcrete CalculatorSlab, patio, driveway, and footing volume in cubic yards; bag counts for 40/60/80 lb bags; weight; ready-mix order size with waste; optional cost estimate.
AggregateGravel & Aggregate CalculatorCrushed stone, gravel, sand, and base material in loose cubic yards and tons, corrected for compaction and waste, with truckload and cost estimates.
EarthworkExcavation & Trench CalculatorBank volume for pads and trenches (vertical or sloped sides), loose volume after soil swell, and dump-truck load planning with hauling cost.
DrainageFrench Drain CalculatorComplete materials list: trench excavation, washed stone in tons, perforated pipe sections, filter fabric with overlap, and required elevation drop.
GradingSlope & Grade CalculatorConvert rise/run, percent grade, and degrees; ratio form, slope length, and fall in inches over 10, 25, 50, and 100 feet.
LandscapingMulch & Topsoil CalculatorMulch, topsoil, and compost in cubic yards and bag counts (2 and 3 cu ft), with weight estimates and the bags-vs-bulk break-even.
ConcreteFence Post Concrete CalculatorBags of concrete per post and per fence line from hole diameter and depth, with post-hole sizing rules by fence height.
UniversalCubic Yard CalculatorRectangles, circles, and triangles to cubic yards, cubic feet, cubic meters, and tons by material - the first step of every estimate.
How our calculators are built
Formulas follow standard construction-estimating practice: volumes computed geometrically, waste factors applied per industry norms, soil swell and aggregate compaction from published earthwork references, and material densities from typical supplier values. Full details, assumptions, and limitations are on our methodology page. Results are planning estimates - always confirm quantities with your supplier and check local c