How do I use a concrete slab cost calculator?

Find cubic yards (or sq ft), then multiply by $/cu yd ready-mix or $/sq ft installed. Add waste and delivery/short-load fees.

How much does a concrete slab cost?

Installed slabs often range roughly $4–$15+ per sq ft depending on thickness, finish, access, and region. Material-only ready-mix is often $120–$200+/cu yd.

How do I calculate concrete pad cost?

Same as a slab: volume × unit price. An 8 × 10 pad at 4 inches ≈ 1.0 cu yd; with waste ~1.1 cu yd of material.

How do I estimate concrete driveway cost?

Calculate driveway sq ft and thickness for yards, then apply local installed $/sq ft. Driveways are often thicker (4–6 in) than patio slabs.

How do I calculate concrete weight for a slab?

Tons ≈ cubic yards × 2.0. A 2.5 cu yd slab weighs about 5 US tons.

Do I need gravel under a concrete slab?

Many slabs use 4–6 inches of compacted crushed stone for drainage and support. Calculate that volume separately with a gravel calculator.

Concrete Slab Cost Calculator Guide: Pads, Driveways & Weight

Quick answer

Concrete slab cost ≈ cubic yards × $/cu yd (material) or sq ft × $/sq ft installed. First get yards with the concrete calculator: sq ft × thickness (in) ÷ 324.

Concrete slab calculator → cost

Calculate cubic yards (include 5–10% waste).
Multiply by ready-mix price per cubic yard for material.
Or multiply slab square footage by installed price per sq ft.
Add gravel base, reinforcement, finishing, and permits separately.

Slab	Sq ft	4 in cu yd	Material @ $150/cu yd*
10 × 10	100	1.23	~$185
12 × 12	144	1.78	~$267
20 × 20	400	4.94	~$741
12 × 40 driveway (5 in)	480	7.41	~$1,112

*Illustrative material-only estimate before delivery fees and labor.

Pad, patio & driveway pricing notes

Pads and patios are usually 4 inches. Driveways often need more thickness and a stronger base, so installed cost per square foot is higher. Always get local quotes — finish (broom, stamped, colored) changes price more than the calculator can guess.

Weight & gravel base

Plan on ~2 US tons per cubic yard of concrete. For base stone under the slab, use the gravel calculator. Yardage how-to: how to calculate yards of concrete.