Material calculators that match how a jobsite actually measures

Enter feet and inches, get cubic yards and bags. No sign-up, no app, no ads between you and the number. Every calculator shows the formula so you can check it by hand.

Concrete Calculator Slabs, footings and pads — cubic yards and bags of 60/80 lb mix. Paint Calculator Wall and ceiling area, minus doors and windows, in gallons. Gravel Calculator Driveways and beds — cubic yards and tons by depth. Tile Calculator Tiles and boxes from room size, tile dimensions and layout. Mulch Calculator Beds in cubic yards and 2 or 3 cubic foot bags. Sod Calculator Rolls and pallets from lawn area, with waste. Drywall Calculator Sheets, mud, tape and screws for a whole room. Fence Calculator Posts, pickets, rails and concrete bags.

Why a calculator beats a rule of thumb

Most “how much do I need” answers online are a single number repeated without context: one bag per post, one gallon per room. Those numbers are wrong often enough to cost a second trip to the yard. The three variables that actually determine the result are volume, waste and the yield printed on the bag. Every tool here asks for all three.

How the estimates hold up

Each calculator uses the published yield or coverage rate from the product category, then adds a waste allowance you control. Concrete is computed from a bag yield of 0.60 ft³ for an 80 lb bag; paint from 350 ft² per gallon for a single coat; gravel from bulk density in tons per cubic yard. If your supplier lists a different number, change the input — the math is transparent on purpose.

Ordering concrete? Round up to the next full bag or quarter yard. Running short mid-pour means a cold joint, which is the one mistake you cannot fix later.

What is coming next

Tile, mulch, sod, deck stain and drywall are in the queue, each with the same treatment: real inputs, visible formula, worked example. If a calculator you need is missing, the about page has the contact address.