All calculators
Every tool is free, works on your phone at the jobsite or the store, and shows its math so you can trust the numbers.
Concrete Calculator
Cubic yards for slabs and footings, plus 40/60/80-lb bag counts with waste factored in.
Calculate →Mulch Calculator
Cubic yards and bag counts from bed size and depth — no more half-empty truck beds.
Calculate →Gravel & Aggregate Calculator
Yards, tons, and bag counts for driveways, drainage, and patio bases.
Calculate →Paint Calculator
Gallons needed by square footage and coats — for walls, ceilings, and exteriors.
Calculate →Fence Calculator
Posts, pickets, rails, and concrete from linear footage. Privacy, picket, or ranch.
Calculate →Roofing Calculator
Squares, shingle bundles, underlayment, and drip edge — adjusted for roof pitch.
Calculate →Deck Calculator
Decking boards, joists, and fasteners from deck dimensions and board width.
Calculate →Flooring Calculator
Boxes to buy with waste factor, plus underlayment for laminate and vinyl plank.
Calculate →Drywall Calculator
Sheets, joint compound, tape, and screws from room dimensions.
Calculate →Sod Calculator
Pallets and rolls needed by lawn area — order fresh sod with confidence.
Calculate →How it works
Built for the way real projects get planned — on a phone, in a driveway, five minutes before the supply run.
Measure
Each calculator tells you exactly what to measure and how. No tape-measure anxiety — most projects need just length, width, and one more number.
Calculate
Get material quantities instantly with sensible waste factors built in. Every result shows the underlying math so you can sanity-check it.
Get it done
Bring the list to the store — or skip the DIY and get free quotes from up to 3 vetted local pros through our quote form.
Why trust JobMath Pro?
We're not a content farm. Every calculator is built on standard trade math — the same formulas contractors use — with conservative waste factors and plain-English guidance.
Real trade math
Concrete at 27 cubic feet per yard. Paint at 350 sq ft per gallon per coat. Three bundles per roofing square. The formulas are shown on every page.
Conservative estimates
We'd rather you have a bag left over than make a second trip. Waste factors default to realistic jobsite numbers, and you can adjust them.
No signup, no spam
Calculators are free with no account required. If you request quotes, we share your details with up to 3 local pros — and tell you so upfront.
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