Concrete slab and wall calculator

Answers the question: How much concrete do I need?

This concrete slab and wall calculator will help you figure out how much concrete you need in cubic meters, the total number of concrete bags required, and the total concrete cost.


Cubic meters of concrete: 0.3375
Number of pre-mixed concrete bags: 41
Total concrete cost: $ 287

Calculating your concrete needs is easy as long as you measure correctly. Keep this in mind as you enter your measurements. A small section where the slab thickness is a bit thicker can significantly affect the calculations on a small concrete project.

Our calculations

At Calculatorian, we are keen to share our knowledge, be transparent and open to feedback. Here are the calculations used to create this calculator. If you find an error or deficiency, contact us and we'll fix it in an instant!

Cubic meters of concrete was calculated like this:

Number of pre-mixed concrete bags was calculated like this:

Total concrete cost was calculated like this:

Variables used in this formula

w = Width of wall or slab in meters
l = Length of wall or slab in meters
t = Thickness of wall or slab in centimeters
pmb = Pre-mixed concrete bag size in kilograms
cb = Cost per pre-mixed concrete bag