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Concrete Calculator

Accurately estimate concrete volume for slabs, footings, and columns. Calculate premix bags needed instantly.

Project Type: Square Slab

Calculate for rectangular driveways, patios, or sidewalks.

TOTAL VOLUME

0.00 yd³

(0.00 Cubic Feet)

PREMIX BAGS NEEDED

80lb Bags
0
60lb Bags
0

How to use the Concrete Calculator

Pouring concrete is permanent, so proper estimation is critical. Our calculator helps you order the right amount of Ready-Mix concrete (measured in cubic yards) or buy the correct number of bags for smaller projects.

  • Step 1: Measure the length and width of the area you want to pave in feet.
  • Step 2: Determine the thickness in inches. Standard sidewalks and patios are 4 inches thick. Driveways often require 6 inches or more for heavy vehicle support.
  • Step 3: Calculate. The results show exactly how many 80lb or 60lb bags you need to purchase from the hardware store, or the cubic yardage to order from a truck.

Pro Tip

Always add 5-10% extra to your order to account for spillage, uneven ground, or waste. It's much cheaper than running out halfway through a pour!

What is a Cubic Yard?

Concrete is sold by volume, not weight (for trucks). One cubic yard is a volume of 3 feet x 3 feet x 3 feet.

27 Cubic Feet
45 80lb Bags

(Approximate conversion for 1 Cubic Yard)