Concrete · updated 2026
Concrete Slab Cost Calculator
Slab, pad, and patio describe the same basic concrete-volume problem: length × width × thickness, with waste and the project’s finish, reinforcement, prep, and labor added separately. Enter the footprint and use case to estimate cubic yards, 80-lb bag equivalents, material cost, reinforcement, labor, cost per square foot, and total. Rates are TBD — verify.
Use the main concrete calculator for a broader concrete material estimate.
TBD — verify ready-mix or local material price
TBD — verify locally
Show the math
Slab volume = 10 × 10 × (4 ÷ 12) ÷ 27
Add 5% waste: cubic yards = slab volume × 1.05 = 1.30
80-lb bag equivalent = waste-adjusted cubic feet ÷ 0.6 = 59 (rounded up)
Total = concrete + reinforcement + site prep + labor = 0 – 0; cost per sq ft = 0 – 0
Slab, pad, and patio
These terms often describe a flat concrete project with the same volume math. The important differences are thickness, load, reinforcement, finish, site preparation, access, and labor.
The calculator leads with a patio but also offers shed-pad, parking-pad, and custom thickness options.
How to use the calculator
Enter length and width, choose a use case, then enter local ready-mix, reinforcement, prep, and labor inputs. The waste-adjusted cubic yards and 80-lb equivalent are shown separately.
The dollar result is only as useful as the rates and scope you enter. Small orders may have delivery or short-load charges that are not inferred.
Thickness, reinforcement, and finish
Four inches is a common planning point for foot traffic; vehicles and heavy loads can require more. Wire mesh, rebar, fiber, joints, and base design depend on the project and local conditions.
Broom and stamped finishes are not the same labor scope. Enter local adders rather than using a generic national price.
Site prep and DIY versus pro
A slab needs a suitable base, forms, drainage, access, placement plan, finishing, and curing. Site prep and labor can exceed the concrete material cost on a small project.
DIY concrete work is time-sensitive. A pro crew may be valuable for placement and finish quality, while local code still controls reinforcement and thickness.
Methodology and assumptions
The calculator uses length × width × thickness ÷ 27, adds 5% waste, and rounds the 80-lb bag equivalent up. Reinforcement, prep, and labor use your entered rates. All price ranges are TBD — verify.
What the numbers mean
Cubic yards is how ready-mix is sold — this calculator adds a 10% waste factor because forms shift, subgrade varies, and spillage happens. Under about 1.5 cubic yards, mixing 80-lb bags yourself is usually cheaper than paying a ready-mix short-load fee; above that, ready-mix wins on both cost and consistency.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| Ready-mix concrete | $140.00 – $180.00 / cubic yard | Verified Wave 1 Batch 3 planning range; short-load and delivery fees vary |
| 80-lb concrete mix bag | $6.50 – $7.50 / 80-lb bag | Verified Wave 1 Batch 3 planning range |
Material, labor, coverage, density, and installation rates are TBD — verify with your local supplier, manufacturer, or contractor. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Use the actual finished footprint and confirm thickness from the project design.
- Four inches is a common patio planning thickness; vehicle and RV pads may need 5–6 inches or an engineered section.
- Reinforcement does not correct a weak subgrade, poor drainage, or missing control joints.
- Plan grading and drainage before forms and concrete delivery.
- Ready-mix short-load fees, access, pump work, and finishing crew minimums can affect small slabs.
- Check local permits, frost conditions, property lines, and utility locations before excavation.
Common questions
Frequently asked questions
How much does a concrete slab cost?
A 2026 installed per-square-foot range is TBD — verify because thickness, size, reinforcement, finish, prep, access, and labor change the quote. The calculator gives a 10×10 example using your entered rates.
What is the difference between a concrete slab cost calculator and a concrete pad cost calculator?
There is no meaningful math difference here. Slab, pad, and patio are common wording choices for a flat concrete project; thickness, reinforcement, finish, prep, and labor define the actual scope.
How much does a 10×10 concrete slab cost?
At 10×10 feet and 4 inches with 5% waste, the calculator returns about 1.30 cubic yards and 59 80-lb bag equivalents. The dollar total is TBD until you enter concrete, reinforcement, prep, and labor rates.
How thick should a concrete patio slab be?
Four inches is a common foot-traffic planning thickness. Parking pads, trucks, and RVs may need 5–6 inches or a designed reinforcement and base section; verify the actual load and local requirements.
Do I need rebar in a concrete slab?
Mesh or rebar may be appropriate for patios and vehicle pads, while light-duty work may use fiber or another design. Follow the project design and local requirements; use the rebar calculator for a separate bar takeoff.
How much is a concrete slab per square foot?
The calculator shows a materials-and-adders result per square foot after your footprint, thickness, reinforcement, prep, and labor inputs. National ranges are TBD — verify; material-only and installed scopes are not interchangeable.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.