Concrete Calculator
Estimate how much concrete your project needs — cubic yards, bags, and a ballpark material cost. Then let CSP Concrete handle the prep, pour, and finish.
Tip: 4" is standard for patios, sidewalks & most slabs; 5–6" suits driveways and heavier loads. Measure in feet, thickness in inches.
Concrete needed
5.50 yd³
Includes ~10% for waste & spillage · 4.94 yd³ net.
297
60-lb bags
223
80-lb bags
Ready-mix material estimate
$770 – $1,020
Material only (delivered concrete). A finished, professionally poured project also includes site prep, forms, reinforcement, labor & finishing.
How to calculate how much concrete you need
Concrete is ordered by the cubic yard. To figure out your volume, multiply length × width × thickness (all in feet), then divide by 27 to convert cubic feet into cubic yards. Since thickness is usually measured in inches, divide the inches by 12 first.
Formula: (Length ft × Width ft × (Thickness in ÷ 12)) ÷ 27 = cubic yards. Add ~10% for waste. The calculator above does all of this for you and rounds up to the nearest quarter yard.
Getting the base and thickness right matters as much as the volume — a slab is only as good as the compacted sub-base under it, especially in Florida's sandy soil. If you'd rather skip the math, see our concrete slab and driveway & flatwork pages, or just request a free estimate.
Concrete calculator FAQ
Common concrete quantity questions
How much concrete do I need for a 10×10 slab?
A 10×10 slab at 4 inches thick is about 1.23 cubic yards — roughly 1.35 cubic yards once you add ~10% for waste. Enter your exact dimensions in the calculator above for a precise number.
How many bags of concrete are in a cubic yard?
A cubic yard is 27 cubic feet. An 80-lb bag yields about 0.6 cubic feet (≈45 bags per yard) and a 60-lb bag about 0.45 cubic feet (≈60 bags per yard). For anything larger than a small pad, ready-mix delivery is usually cheaper and stronger than bags.
How thick should my concrete be?
Four inches is standard for patios, sidewalks, and most slabs. Driveways and areas that carry heavier vehicles or loads are usually poured 5–6 inches thick over a properly compacted base.
Should I order extra concrete?
Yes. Always order about 10% extra to cover spillage, an uneven sub-base, and form variations — running short mid-pour is far worse than having a little left over. The calculator adds this overage for you.
How much does poured concrete cost in Central Florida?
Ready-mix material runs roughly $140–$185 per cubic yard delivered, but a finished project also includes site prep, forms, reinforcement, labor, and finishing. For an all-in price, request a free estimate from CSP Concrete.
Free estimates · No pressure
Ready to pour new concrete in Ocala?
Tell us about your driveway, slab, patio, or sidewalk project. We'll measure the site, walk you through finish options, and send a clear written estimate — usually within a day or two.