Measure once. Buy the right amount.

Free calculators for concrete, decks, fences, flooring, tile, paint, roofing and more. Get the quantity, the bags and a cost estimate before you head to the store. No sign-up, nothing to install.

Quick concrete slab

I need

1.36 yd³

That's 62 bags of 80 lb mix, or 82 bags of 60 lb. Includes 10% extra.

Open the full concrete calculator

What are you building?

Every calculator shows its formula and works on your phone at the store. Pick the job closest to yours.

Concrete & Yard

Slabs, patios, fences, decks and garden beds

Floors & Paint

Flooring, tile, drywall, trim and paint

Roof & Siding

Re-roofs, new builds and siding

Free, with no accountOpen a calculator and type. Nothing to sign up for.

Private by designThe math runs on your device. We never see your measurements.

The formula is on the pageEach result shows how it was calculated, so you can check it.

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Tips before you buy

Measure in feet and inches, then let the calculator convert. Always buy a little extra: 5% to 10% for concrete and gravel, 10% to 15% for flooring and shingles. Returning a spare bag is easier than a second trip mid-pour.