Concrete Calculator

The Concrete Calculator estimates the volume and weight of concrete necessary to cover a given area.


About concrete calculators

Our concrete calculator can help you determine how much concrete you need, the costs involved, if you require concrete bags or ready mix, a how-to formula, and the waste allowance amount.

Definition of a concrete calculator

A concrete calculator is an automated program used to estimate the amount of concrete, in volume or weight, to fill a given area. Typically in the US concrete is sold in pound bags or by the cubic yard.

How to calculate how much concrete is needed?

  1. Determine the width, length, and depth of the area you want to concrete
  2. Multiply width by length (this = Square Footage)
  3. Convert depth from inches into feet by dividing by 12
  4. Now multiply the square footage (width x length) by the converted depth (depth inches / 12)
  5. This is the total cubic feet needed.
  6. To convert into cubic yards, start by dividing cubic feet by 27

Concrete equation

((w x l) x (d / 12)) / 27 = cubic yard
w = Width, l = length, d = depth


Mr. Calculate needs a slab of concrete covering 20 feet by 20 feet at 6 inches deep.

((20 x 20) x (6 / 12)) / 27 = 7.407 cubic yards

Popular square footage areas

Disclaimer: All calculators, tools, and results featured on are to be finalized and not be considered a quotation or binding contract.
Proofs and formulas are provided as references.