How to Calculate a Concrete Slab

Written by elizabeth arnold
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Building a concrete slab for a home, office or deck requires basic math and calculation skills. Concrete slabs are available in many different sizes, shapes and thickness. The one that you choose will depend on your home building needs. Measuring a simple rectangular concrete slab is easy, but the task can get a little more complicated if you are trying to calculate the cubic yards needed for a circle slab.

Skill level:
Moderately Easy

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Things you need

  • Tape measure
  • Concrete slab
  • Paper
  • Writing utensil

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  1. 1

    Measure the length of the slab with a tape measure. Record the measurements on a piece of paper.

  2. 2

    Measure the width of the slab with a tape measure. Again, record the measurement on a piece of paper.

  3. 3

    Measure the thickness of the slab with a tape measure. Record the figure on a piece of paper.

  4. 4

    Multiply the length by the width by the height of the slab.

  5. 5

    Divide the number you reached in Step 4 by 27 to measure the cubic yards of the concrete slab.

Tips and warnings

  • For slabs that comprise multiple rooms, it will be easier to calculate the cubic yards of each room and then add them together to get the total cubic yards. For triangle slabs, measure the same way you would for a rectangle or square slab. Then divide by two to get cubic yards.

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