Concrete Calculator Need to figure out how much concrete you’ll need for your project? Use any of these handy calculators: Slabs, Square Footings, or Walls length footinchyardmetercentimeter width footinchyardmetercentimeter thickness or height footinchyardmetercentimeter quantity Hole, Column, or Round Footings diameter footinchyardmetercentimeter depth or height footinchyardmetercentimeter quantity Circular Slab or Tube outer diameter footinchyardmetercentimeter inner diameter footinchyardmetercentimeter length or height footinchyardmetercentimeter quantity powered by calculator.net