Estimate the concrete you need for slabs, footings, and walls. This calculator computes cubic feet, cubic yards, 80lb bag count, and cost — all in one place. Perfect for DIY patio pours, driveway estimates, and foundation planning.
US average: $150/yd³. Adjust for your region.
📊 Concrete Estimate
Volume — Cubic Feet—
Volume — Cubic Yards—
80 lb Bags Needed—
60 lb Bags Needed—
Estimated Cost—
Surface Area—
Includes a 5% waste factor. Order 5–10% extra for safety.
How to Use the Concrete Calculator
Start by selecting your project type — Slab (patios, driveways, shed floors), Footing (continuous foundation footings), or Wall (retaining walls, foundation walls). Enter the dimensions in feet and inches as prompted. The calculator instantly converts depth/thickness from inches to feet for accurate volume calculations.
The cost estimate defaults to $150 per cubic yard, which reflects the national average for ready-mix concrete delivery. Adjust this value based on quotes from your local supplier — prices can range from $120 to $200 per yard depending on your region, the concrete mix, and delivery fees. For small DIY jobs, the bag count estimate tells you exactly how many 80 lb or 60 lb bags to buy at the hardware store.
All results include a 5% waste factor to account for spillage, uneven ground, and minor measurement errors. For critical structural pours, we recommend ordering an additional 5–10% beyond the calculated amount.
Concrete Project Tips
Always over-order. Coming up short on a pour is expensive — a second short-load delivery costs far more than the extra yard you didn't order.
Subgrade prep matters. Compact and level your gravel base before pouring. A 4-inch slab on loose soil will crack within the first year.
Check your local frost line. Footings must extend below the frost depth in your area to prevent heaving. Check your local building code.
For bagged concrete: one 80 lb bag yields about 0.6 cubic feet. Mix smaller batches if you're working alone — concrete sets fast in hot weather.
You need approximately 45 bags of 80 lb concrete or 60 bags of 60 lb concrete per cubic yard. One 80 lb bag yields about 0.6 cubic feet of mixed concrete. Our calculator does this math automatically so you can walk into the hardware store knowing exactly what to buy.
For most residential projects: patios and walkways need 4 inches, driveways for standard vehicles need 4–5 inches, and garage floors or heavy-use areas need 6 inches. Always check local building codes — some municipalities require a minimum of 4 inches with wire mesh reinforcement for any occupied structure.
Ready-mix concrete typically costs $120–$200 per cubic yard delivered, with a national average around $150/yd³. Short-load fees apply for orders under 5 yards. Bagged concrete costs more per yard (roughly $180–$250/yd³ in 80 lb bags) but eliminates delivery fees and minimum order requirements.
A slab is a flat horizontal pour (patios, floors, driveways). A footing is a continuous strip foundation that sits below frost line and supports walls. A wall pour is vertical — used for foundation walls and retaining walls. Each has a different volume formula, which our calculator handles by letting you switch between modes.
Use ready-mix delivery for any job over 1 cubic yard — it's cheaper per yard and saves hours of mixing labor. Bagged concrete is best for small repairs, fence post settings, or any pour under 20 bags. A typical cement mixer holds 2–3 bags at a time; mixing 45 bags by hand for a full yard is grueling work.