Concrete Calculator
Work out how many cubic yards of concrete you need for a slab, floor, patio or pad.
How the math works
Concrete is ordered in cubic yards. Multiply length x width x thickness (all in feet) to get cubic feet, then divide by 27, because there are 27 cubic feet in a cubic yard. Thickness is usually in inches, so divide it by 12 first.
Example: a 24 x 24 foot slab at 4 inches is 24 x 24 x 0.333 = 192 cubic feet, divided by 27 = about 7.1 cubic yards. With 10% extra, about 7.8 yards.
Why order extra
Bases are never perfectly flat, forms flex a little and some concrete stays in the chute. A small cushion keeps you from coming up short at the end of a pour, which is far worse than a little left over.
Footings and thickened edges
For a monolithic slab, figure the slab, then add the thickened edge as its own long, narrow piece: perimeter length x edge width x extra depth. Footings work the same way. For a big floor like the 60 yard barndominium floor we poured in Holland Patent, getting this right matters.
Want a real number?
We'll measure on site and give you a free estimate that includes the base, forms, reinforcement and finish. Call or text (607) 244-5118.
Get a real number
(607) 244-5118Call or text, or send the form. Tell us what you're thinking and where the job is, and we'll get back to you.
- Phone
- (607) 244-5118
- natebenn03@gmail.com
- Based in
- Norwich, NY
Straight answers.
Don't see yours? Call (607) 244-5118. You'll talk to the people doing the work.
How many yards of concrete for a 24 x 24 garage floor?
At 4 inches thick, about 7.1 cubic yards, or about 7.8 with 10% extra.
How do I convert cubic feet to cubic yards?
Divide by 27.