How this calculator works
π × radius² × filled depth, multiplied by the form count.
Measurement and ordering notes
Measure the inside of the forms and check depth in several places. Volume estimates include the selected waste allowance when shown. Bag yields, aggregate density, concrete weight, prices, and site conditions vary by product and supplier.
Material and cost estimates
Optional material breakdowns use clearly stated planning assumptions. Cost results use the price you enter and do not automatically include delivery, pumping, labor, tax, minimum loads, or equipment.
Frequently asked questions
How do I use this calculator?
Enter measured form dimensions, quantity, and a waste allowance. The tool converts the volume into common units.
Does it design the structure?
No. It estimates material quantity only. Follow approved drawings and local requirements for structural dimensions and reinforcement.
Why should I confirm the final order?
Form dimensions, subgrade, placement, supplier minimums, and product yield can change the amount needed.