Pick a project.
Get a usable plan.
Start broad or choose a focused calculator for the exact job you have in mind. Every tool keeps the measurement assumptions visible and uses deterministic formulas for the final quantity.
Concrete calculators
Volume and purchasing tools for patios, slabs and bagged concrete.
Concrete Calculator
Slabs, patios, pads and rectangular pours.
Open calculator →Concrete Patio Calculator
Calculate concrete for a patio from length, width and thickness.
Open calculator →Concrete Slab Calculator
Estimate concrete volume for a rectangular slab using length, width and thickness, with waste allowance, bag equivalents and editable material pricing.
Open calculator →Concrete Bag Calculator
Estimate how many 60-lb or 80-lb bags of concrete a small rectangular pour may require, with waste allowance and equivalent concrete volume.
Open calculator →Gravel calculators
Estimate aggregate by volume, weight and project depth.
Gravel Calculator
Aggregate volume, weight and planning cost.
Open calculator →Gravel Driveway Calculator
Estimate gravel for a driveway using length, width and depth.
Open calculator →Gravel Depth Calculator
Calculate how much gravel a rectangular area needs at a selected depth, including volume, estimated weight, allowance and editable material cost.
Open calculator →Fence calculators
Turn fence-line length and spacing assumptions into a material takeoff.
Fence Calculator
Panels, posts, rails, gates and post concrete.
Open calculator →Fence Material Calculator
Estimate fence panels, posts, rails, gate openings and post concrete from total fence length and section width.
Open calculator →Fence Post Spacing Calculator
Estimate how many fence posts and sections you may need from total fence length and chosen spacing, with gate openings and post concrete.
Open calculator →Paint calculators
Estimate interior or exterior wall paint using editable coverage assumptions.
Paint Calculator
Wall area, openings, coats, primer and paint quantity.
Open calculator →Interior Paint Calculator
Estimate interior wall paint from room length, width, ceiling height, doors, windows, coats and paint coverage.
Open calculator →Exterior Paint Calculator
Estimate exterior wall paint for a simple rectangular building footprint using length, width, wall height, openings, coats and paint coverage.
Open calculator →Paint Coverage Calculator
Estimate paint quantity from wall area, coats and an editable square-feet-per-gallon or metric coverage rate.
Open calculator →Describe the project instead.
The PrepMyBuild intake can route a plain-English description to the right calculator and fill the measurements it understands.