NumberTally Home & DIY Calculators
Measure twice, buy once. These free estimators turn your room and project dimensions into exact material counts — tiles, cubic yards of mulch, drywall sheets, roofing squares, concrete bags, and paint gallons — with waste factors built in so you never come up short mid-project. Everything runs in your browser; no sign-up, no fees.
All home & diy calculators tools
Tile Calculator
Tiles and boxes needed for any floor or wall — with waste factor and custom tile sizes.
Mulch & Topsoil Calculator
Cubic yards, bag counts and weight for mulch, topsoil, gravel and sand.
Drywall Calculator
Sheets, screws and joint compound for walls and ceilings, minus doors and windows.
Roofing Calculator
Roof squares and shingle bundles from footprint and pitch — with waste included.
Concrete Calculator
Cubic yards and bag counts for slabs and columns — includes 5% waste.
Paint Calculator
Gallons of paint from wall dimensions — doors and windows subtracted.
Measure once, cut the guesswork
Every estimator here follows the same pattern: enter your dimensions, get the material count with waste already added. For tile, that means floor area divided by tile area, rounded up, plus your waste percentage. For roofing, footprint times the pitch multiplier gives true roof area, divided into 100-square-foot "squares." The steps shown under each result walk through your exact numbers.
Why waste factors matter
The difference between a smooth project and a third trip to the store is the waste allowance. Diagonal tile layouts can waste 15%, complex roofs with valleys more. These calculators default to sensible waste percentages and let you adjust — buying 10% extra up front is always cheaper than a second delivery fee.
Frequently asked questions
How much extra material should I buy for waste?
Tile and flooring: 10% is the standard allowance for cuts and breakage. Roofing: 10–15% depending on complexity. Drywall: about 10%. Our calculators include an adjustable waste factor so you can match your project.
How many square feet are in a roofing square?
One roofing "square" covers 100 square feet. A 1,500 sq ft roof needs 15 squares before waste — shingles are sold by the square (usually 3 bundles each).
How do I convert cubic feet to cubic yards for mulch?
Divide cubic feet by 27. A 10×10 ft bed at 3 inches deep is 25 cubic feet, or just under 1 cubic yard.
Are these estimates exact?
They are planning estimates. Real projects vary with cuts, overlaps, and site conditions — always round up and confirm with your supplier before ordering.