How do I calculate cubic yards of concrete?

Multiply length × width × thickness (all in feet), then divide by 27 to convert cubic feet to cubic yards. For example, a 10' × 10' slab at 4" thick is 10 × 10 × 0.33 = 33 cubic feet ÷ 27 = 1.22 cubic yards.

What thickness should my concrete slab be?

Residential driveways: 4-6 inches, sidewalks: 4 inches, garage floors: 4-6 inches, patios: 4 inches, footings: 8-12 inches depending on load. Heavy vehicle traffic or commercial use requires thicker slabs.

How much does a cubic yard of concrete cost?

Concrete prices typically range from $120-$150 per cubic yard for standard residential delivery, plus delivery fees. Prices vary by location, additives, and minimum order requirements. Small loads under 10 yards often incur additional charges.

Should I order extra concrete?

Yes, order 5-10% extra to account for spillage, uneven subgrade, and calculation errors. It's better to have slightly too much than run short mid-pour. Most companies charge premium rates for same-day return trucks.

How long does concrete take to cure?

Concrete is typically walkable after 24-48 hours but takes 28 days to reach full strength. Avoid heavy loads for at least 7 days. Keep concrete moist during curing for best results, especially in hot weather.

Everyday

Concrete Calculator

Calculate concrete volume in cubic yards and bags needed.

Project Type

Length (ft)

Width (ft)

Thickness (inches)

Enter dimensions

How to Use This Calculator

Measure the Area

Measure length and width of the area in feet. For irregular shapes, break into rectangles or use the average width. Determine the thickness in inches (typically 4-6 inches for most residential projects).

Input Dimensions

Enter length, width, and thickness into the calculator. Make sure to convert thickness to the correct unit (inches to feet if needed) or use the thickness field in inches.

Calculate Cubic Yards

The calculator converts your measurements to cubic yards, the standard unit for ordering concrete. Review the result and note any special requirements for your project.

Add Extra and Order

Add 5-10% to your calculated amount for waste and spillage. Contact concrete suppliers with your total cubic yards. Prepare the site and have adequate labor ready for the delivery window.