How this calculator works
Concrete volume and a nominal ratio are used to estimate cement bags.
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
Are the material quantities a mix design?
No. They are rough estimates using a nominal ratio and simplified yield assumptions. Use an approved mix design for construction.
Why can bag counts differ?
Cement bulk density, bag size, moisture, mix ratio, and yield differ by product.
Does the calculator include water?
It shows an approximate water guide from the entered water-cement ratio; actual batch water must follow the approved mix and moisture corrections.