A material calculator for home projects. Say the job in plain words and it works out what to buy.
Guess low and you drive back. Guess high and nine bags sit in the garage till spring.
Free, and nothing leaves your browser.
Say what you are building and this tells you what to buy, rounded to whole bags, gallons, rolls or sheets, with the arithmetic beside the answer. Every number written in ink is yours to change — tap one and type. Twenty sheets, free, nothing uploaded.
A free browser tool that works out how much material a home project needs. Type the job in plain words — "mulch for a 20 by 10 bed, 3 inches deep" — and it picks the right sheet from twenty, asks for anything missing, and gives you a number you can take to the store. No signup, no app, nothing uploaded.
Area times depth, divided by 27 for cubic yards. A 20 by 10 bed at 3 inches is 50 cubic feet, or 25 bags at 2 cu ft. Depth is the whole calculation: the same bed at 2 inches versus 4 is twice the mulch and twice the money.
Wall area times coats, divided by the coverage on the can. A 14 by 12 room with 8 ft ceilings is 416 sq ft, so two coats at 350 sq ft per gallon is 3 gallons. That coverage figure decides the answer far more than door and window deductions do — read your can and change it.
An 80 lb bag yields 0.60 cu ft, a 60 lb bag 0.45, a 40 lb bag 0.30. A 10 by 10 slab at 4 inches is 33 cu ft, so 62 bags at 80 lb with waste allowed. Past a cubic yard, a ready-mix truck is usually cheaper and always faster.
A ring is a circle, so the maths is the distance across, halved, squared, times pi. A 5 ft ring at 3 inches deep works out at 20 sq ft, 5 cubic feet, or 3 bags at 2 cu ft. Type "mulch a 5 ft tree ring, 3 inches deep" and the sheet draws it. Keep the mulch off the trunk — a ring, not a volcano.
Past about two cubic yards, usually yes — that is 27 or more bags to open and haul. Under that, bags win on handling. The sheet flags the crossover when your job is near it.
On any sheet driven by an area, tap "Add a part" for another rectangle or "Add a circle" for a round one. Parts add together, so an L shape is two rectangles and a T is three. For a tree ring or a round bed, tap "Make it round" and give the distance across — or just say it: "mulch a 5 ft tree ring, 3 inches deep." You can also type the square footage straight in if you already know it.
Manufacturer data sheets and university extension programs — Quikrete, Sherwin-Williams, Benjamin Moore, Valspar, National Gypsum, Cabot, Pavestone, UMass, Penn State, UMN and UF/IFAS — named on the sheet with the date they were read. Where nobody publishes a figure, like the weight of a yard of gravel, the sheet says so and leaves it editable rather than inventing one.
Put the shelf price in the blank beside the answer and the sheet works out the total. A 20 by 10 bed at 3 inches is 25 bags; at $4.97 a bag that is $124.25. The price stays on the sheet, so you can change the depth and watch the total move before you decide.
Say so in the job line — "seed a 5,000 sq ft lawn, I have 20 lb" — and the answer becomes what is still missing rather than the whole job. If you already have enough, it says so and tells you what to leave at home.
The ceiling, yes: the paint sheet ends with coats on the ceiling, set to none by default. Tap it to 1 or 2 and the ceiling area joins the total. Paint also rounds to quarts, not just gallons, so a closet reads three quarts instead of a whole gallon you will not finish. Trim is not built yet.
No. Everything runs in your browser. Nothing you type is uploaded, and your last job on each sheet is kept on this device only, so you can pick up where you left off.
Yes. The sheet stacks to one column, the answer comes first, and the number fields bring up a numeric keypad. It works offline once the page has loaded.
You do not pick a calculator first — you describe the job and it picks. Every answer prints its own arithmetic and names its source, and quantities round to what a store actually sells rather than to a decimal. If you want general math instead, try Pocket Calculator.