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Free, easy-to-use calculators for construction, landscaping, interiors, everyday math, and more. Get clear results in seconds and make smarter decisions.
Popular Calculators
Choose from our most-used calculators and get useful estimates for your projects and plans.
Concrete Slab, Footing and Column Calculator
Estimate concrete for slabs, footings, pads, and columns; compare ready-mix with 40, 50, 60, and 80 lb bags.
Open calculator →MeasureSquare Footage Calculator
Add or subtract rectangular, circular, triangular, and trapezoidal areas with flexible measurement units.
Open calculator →MeasureCubic Yard Calculator
Calculate net volume for multiple rectangular, circular, triangular, or trapezoidal material zones.
Open calculator →LandscapingGravel Tonnage and Cost Calculator
Estimate gravel volume, compacted tonnage, bags, supplier minimums, delivery, and cost for multiple zones.
Open calculator →LandscapingMulch Calculator
Estimate bulk mulch, bags, minimum orders, delivery, and cost across multiple landscape-bed shapes.
Open calculator →InteriorRoom Paint and Primer Calculator
Estimate wall, ceiling, primer, and paint quantities for multiple rooms with doors and windows deducted.
Open calculator →Browse Calculators by Project
Choose a focused collection for the material, space, or project stage you are planning.
Concrete & Masonry
Plan slabs, footings, columns, driveways, reinforcing steel, mortar, and other concrete work with editable ordering assumptions.
Browse category 5 calculatorsMeasurement & Math
Measure project areas and volumes, total lumber, or handle everyday and scientific calculations with transparent results.
Browse category 19 calculatorsLandscaping & Yard
Estimate gravel, mulch, soil, sod, seed, fertilizer, drainage, irrigation, stone, and other landscape-project materials.
Browse category 21 calculatorsExterior Projects
Plan roofing, siding, framing, paving, fencing, decks, stairs, openings, excavation, and other exterior project quantities.
Browse category 18 calculatorsInterior Projects
Estimate paint, flooring, drywall, insulation, trim, cabinets, ceilings, HVAC planning, and other interior project quantities.
Browse categoryHow it works
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