How to use the ready-mix concrete volume calculator
Give the slab its width, length and thickness, the columns their two section sides plus height and count, and the beams their width, depth, length and count. The page adds the volume of each member and shows the net figure in cubic feet and cubic yards along with an order volume that includes waste. Leave a member blank if you do not have one and the result says so.
The arithmetic is simply the sum of rectangular prisms, with inch dimensions divided by twelve before multiplying, and cubic yards taken as cubic feet over twenty-seven. It is current as of October 2026; turning sizes into volume is a definition rather than a standard, so no outside source is needed.
A waste allowance was not confirmed in an authoritative source, so none is suggested and only your own figure is applied. Truck delivery counts, slump and air content, and mix design are not covered. This calculator is for reference and does not replace design. Review by a qualified engineer is required.
Frequently asked questions
Waste allowances vary with the member and the pouring method and were not confirmed in an authoritative source. No standard allowance is offered here, so the page applies only the figure you enter.
This page stops at totalling the pour volume from member sizes. Dividing that volume by mixer truck capacity is not covered, so work out deliveries separately once you have the volume.
No. The page multiplies the rectangular sizes you type, so openings and the volume taken up by reinforcing steel are not deducted. Enter already-adjusted sizes if you need those deductions.