Spike's Calculators

Pentagon Shaped Concrete Slab

Calculator For Pentagons Spike VM

A pentagon is a 5-sided polygon and can come in many shapes. This calculator is for calculating the volume of a regular pentagon.

In a regular pentagon, all sides are equal in length, and each interior angle is 108°. To calculate the volume of this slab, you need to provide the length of one side plus the required thickness.

Pentagon Shaped Volume Calculator - Imperial

Length of Side:   ft  in.
Depth:   in.

Amount of concrete needed:

Area:   ft ²
Perimeter:   l.ft
Cubic Feet:   ft ³
Cubic Yards:   yd ³
Cubic Meters:   m ³


  1. enter the length of one side in feet
  2. slab thickness in inches


  1. the area of the slab in square feet
  2. the perimeter of the slab in lineal feet for forming material
  3. concrete needed for pouring this slab in cubic feet
  4. amount of concrete in cubic yards
  5. amount of concrete in cubic metres

When Ordering Concrete

This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed, does not include any waste. It is recommended, depending on the job you are doing, to add anywhere from an extra 4% to 10% to your concrete order to make sure you have enough concrete to finish the job. Ask when ordering the concrete. They will be able to give you a good idea of what is needed.
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