Spike's Calculators

Plastic Concrete Footing Form

Calculate the amount of concrete needed using plastic forms

There are a few different brands available, and they will be easier to use for the average person that needs to place forms for pillars or posts that have to support a deck or an overhang.

Brand Model Concrete Volume
Bigfoot BF20 1.75 ft³
Bigfoot BFT10 2.18 ft³
Bigfoot BF24 2.50 ft³
Bigfoot BF28 3.25 ft³
Bigfoot BF36 6.0 ft³
SquareFoot SF-22 2.0 ft³
SquareFoot SF-28 4.5 ft³
SquareFoot SF-32 7.0 ft³
Redi Base 8" x 24" 2.0 ft³

Example of how to use this calculator:

4 big foot BF24 concrete forms with 10" diameter concrete tubes
BF24 = 2.5 ft³ - enter in field one of calculator  2.5
tube diameter = 10" -  enter in field two of calculator  10
form 1 concrete tube height = 1' - 6"
form 2 concrete tube height = 2' - 1"
form 3  concrete tube height = 1' - 7"
form 4  concrete tube height = 2' - 4"
for a total height  of   7' - 6" enter in field three of calculator  7 feet  6 inches
four forms used - enter in field four of calculator a 4
Result:  you will need  14.09 ft³ of concrete
Plastic Concrete Footing Form

Plastic Concrete Footing Forms

Capacity of Plastic Form ft³
Diameter of Concrete Tube Form in
Height of Concrete Tube Form ft in.
Number of Plastic Forms #

Amount of concrete needed:

Cubic Feet of Concrete Needed ft³
Cubic Yards of Concrete Needed yd³
Cubic Metres of Concrete Needed


  1. enter the volume of your concrete form in cubic feet
  2. diameter of the tube in inches
  3. height of tube(s) in feet and inches (for multiple forms add all individual height sections together)
  4. number of forms used


  1. amount of concrete needed in cubic feet
  2. amount of concrete needed in cubic yards
  3. amount of concrete needed 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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