Home & DIY calculators
Square footage, concrete, paint and flooring calculators to plan home projects and buy the right amount of materials.
Concrete Calculator
Work out how much concrete you need for a slab, patio, footing or post holes in cubic yards and 40, 60 or 80 lb bags.
Square Footage Calculator
Calculate square footage for rectangular, circular and triangular areas, with square meters, square yards and project cost.
Flooring Calculator
Calculate how much flooring, tile or laminate to buy, including waste, number of boxes and total cost.
Paint Calculator
Estimate how many gallons of paint you need for a room from wall dimensions, doors, windows and number of coats.
Measure once, buy right
Running out of materials halfway through a job costs a second trip; over-buying wastes money. These calculators turn room and slab measurements into the quantities stores actually sell: square feet, cubic yards, bags, gallons and boxes. Each one includes a waste allowance, because real projects always involve cuts, spills and uneven surfaces.
Measurements are in feet and inches, the units US stores use. Always round up to the next full bag, gallon or box, and keep receipts so unopened extras can be returned.
Home & DIY guides
Room Makeover Math: Estimating Paint and Flooring Like a ProMeasure a room once and work out exactly how many gallons of paint and boxes of flooring to buy, with waste allowances and budgeting tips.
How to Estimate Concrete for a Slab, Patio or FootingMeasure, convert to cubic yards, add the right waste factor and decide between bags and ready-mix, with worked examples for common DIY projects.