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Concrete Volume Calculator

Calculating concrete volume sounds simple — length × width × thickness — but the conversion to cubic yards (the unit ready-mix is sold in) and bags (for smaller jobs) is where most homeowners and DIYers get tripped up. This calculator handles the conversion plus a real-world FL waste factor, and tells you whether bags or ready-mix delivery is the right call for your project.

Concrete volume calculator

Cubic yards, bags needed, and ready-mix delivery cost. FL waste factor included.

Volume needed
8.69 cu yd
Equivalent bags
392 × 80-lb
Bags cost (retail)
$2,666–$4,116
Ready-mix delivered
$1,391
For most slabs over 1 cubic yard, ready-mix delivery is the right call. Below that, bags are usually fine and avoid the short-load premium.

How to use this calculator

  1. Enter the length and width of your slab or footing in feet. For irregular shapes, break it into rectangles and add up the volumes.
  2. Set the thickness in inches. Standard FL slab thickness: 4 inches for driveways/patios, 5–6 inches for trucks or RVs, 6+ inches for slab-on-grade home foundations.
  3. Adjust the waste percentage. 10% is typical for clean slab pours; 15–20% for footings, trenches, or anywhere over-pour is harder to control.
  4. Pick bag size if you're buying bags — 80-pound is more economical for larger projects; 60-pound is easier to handle for older homeowners or DIYers.
  5. Adjust the ready-mix price if you've gotten a quote — FL ready-mix runs $140–$185/yd delivered depending on metro and short-load fees.
Numbers updated quarterly
Material rates and labor multipliers come from BuildPriced's internal contractor quote dataset and published industry reports. Last reviewed 2026-05-09.

Calculator FAQs

When should I use bags vs ready-mix?

Under about 1 cubic yard, bags are usually cheaper and more practical — you can mix at the project site as needed without a delivery fee. Above 1 cubic yard (typically a slab over about 81 sqft at 4-inch thickness), ready-mix delivery becomes cheaper and saves the labor of mixing 50+ bags. Most concrete delivery has a short-load minimum charge of $80–$200, so very small jobs just don't make sense for delivery.

Why is FL ready-mix more expensive than other states?

Florida's Portland cement supply chain runs longer than most states (most cement comes from Texas, Mexico, or marine imports through Tampa and Jacksonville), and FL contractors often pour during early-morning windows to avoid heat — which adds labor cost. Expect to pay $10–$30 more per cubic yard than national average pricing.

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