Pour a patio, shed pad or footing with confidence by calculating the concrete volume before you order. Enter the slab length and width in feet and the thickness in inches, and the calculator returns the volume in cubic feet and cubic yards. Ready mix trucks and most suppliers sell by the cubic yard, so that number tells you what to order, while the bag counts help for small jobs mixed by hand. A standard eighty pound bag of concrete mix yields about six tenths of a cubic foot, and a sixty pound bag about half a cubic foot, which the tool uses to give bag totals rounded up. Always add a little extra for spillage and uneven subgrade on real pours. Every figure is computed instantly in your browser without sending your project dimensions anywhere.
It multiplies slab length, width, and thickness to get volume and converts it to cubic yards, the standard concrete unit.
An 80 lb bag of concrete mix yields about 0.6 cubic feet, so roughly 45 bags make one cubic yard, which the tool uses for its bag count.
Yes. A small overage of about 5 to 10 percent is wise to cover spillage and uneven subgrade.
Pour a patio, shed pad or footing with confidence by calculating the concrete volume before you order. Enter the slab length and width in feet and the thickness in inches, and the calculator returns the volume in cubic feet and cubic yards.
Yes. Concrete Slab Calculator is completely free, with no sign-up and no usage limits.
Yes. Concrete Slab Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Concrete Slab Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.