Pick model of footing form being utilized.
Pick quantity of forms being utilized.
Pick dimension of construction tube utilized.
Pick length/height of construction tube being utilized.
Pick quanity of construction tubes being utilized. (Should be the same as the quantity of footings chosen)
Press on CALCULATE button.
This will calculate total amounts of concrete you need to order or pickup for your project.
Use this to clear calcuations and repeat the process again if needed.