Start with the final concrete dimensions, not the excavation size unless they are the same. Group sections with different thicknesses separately, then use one combined quantity.
What to say to the supplier
Read three numbers from the concrete calculator, in this order: the measured volume, the volume after your waste allowance, and the order quantity after the supplier’s increment. Then add the placement facts the calculator does not know: the address, whether the truck can reach the forms, whether you need a pump, who will be there, and the arrival window. Ask the supplier to repeat the order quantity in cubic yards or cubic meters before you accept it.
Turn measurements into an order quantity
Keep three numbers visible: measured volume, volume after the chosen allowance, and the quantity after rounding to the supplier’s increment. That separation makes it possible to explain why the order is larger than the geometry without pretending the extra material was measured.
Before calling
- Confirm the calculated volume and waste allowance.
- Check the supplier’s minimum order and billed increment.
- Have the delivery address, pour date, placement method, and access notes ready.
- Ask which fees apply to the quoted quantity.
- Confirm the ordered quantity, mix specification, arrival window, and cancellation terms in writing.
Describe access and placement
Tell the supplier whether the truck can reach the discharge point, whether a pump or other placement equipment is planned, and who will be ready to receive the load. Ask how much unloading time is included and what happens if the site is not ready.
Compare written quotes on the same basis
Use the same order quantity when comparing suppliers. Record price per cubic yard or cubic meter, delivery, short-load, pump, waiting, fuel or environmental charges, and tax separately. A lower unit price can still produce a higher invoice when the fee structure differs.
ConcreteQty estimates volume and entered costs. The supplier and responsible project professional should confirm the mix specification and final order.
Run these numbers in the concrete calculator. The cited sources are the yields and ordering references behind the count.