How much concrete do I need for a 10 × 10 slab?

At 4 inches thick, a 10 × 10 ft slab uses about 1.24 cubic yards net, or 1.36 cubic yards with 10% waste. That is 62 × 80 lb bags. A ready-mix order rounds up to 1.5 cubic yards.

How many bags of concrete are in a cubic yard?

One cubic yard is about 45 × 80 lb bags, 60 × 60 lb bags, 72 × 50 lb bags, or 90 × 40 lb bags. Always confirm the yield printed on the product you buy.

Should I use bags or ready-mix?

Under about 1 cubic yard, bags are often practical. Over 2–3 cubic yards, ready-mix usually saves substantial labor. Small truck deliveries may carry a minimum order and a short-load surcharge, both included in this estimate.

How thick should a concrete slab be?

A common starting point is 4 inches for patios, walkways, and sheds; 5 inches for car driveways; and 6 inches for heavier vehicles or garages. Soil, load, frost depth, and local code govern the final design.

What rebar do I need?

Light 4-inch slabs often use 6 × 6 wire mesh or #3 bar. Vehicle slabs commonly use #4 bar at 12–18 inches on center. These are estimating defaults, not structural design; local code and an engineer govern.

How much does concrete weigh and cost?

Normal concrete weighs about 150 lb per cubic foot, roughly two tons per cubic yard. Ready-mix commonly runs around $140–185 per yard before local delivery charges. Every price in the calculator is editable.

Do you store my measurements?

Calculations run in your browser and this site uses no account, analytics, or advertising cookies. Your last inputs may be stored locally on your device. If you open or share a generated link, its measurement parameters are included in that URL.

Terms of Use

Effective July 20, 2026

Effective July 20, 2026

This calculator provides planning estimates only. Actual concrete yield, site conditions, form dimensions, compaction, spillage, delivery minimums, taxes, and local prices vary.

Thickness and reinforcement suggestions are general estimating defaults, not engineering advice. Soil, load, drainage, frost depth, local code, permits, and a qualified professional govern your project.

Verify quantities against the bag label and your ready-mix supplier before buying. The service is provided “as is,” without warranties. To the fullest extent permitted by law, the site owner is not liable for losses arising from use of an estimate.