Slab 1
Length: — ft · Width: — ft · Thickness: — in
Concrete order planner
How much concrete do you need?
Enter the measurements. Get an order-ready quantity with waste and supplier rounding shown separately.
Quantity, not structural designMath shown with every result
Project
Transparent by design
Every extra yard is explained.
ConcreteQty keeps the calculated volume, waste allowance, and order rounding separate. The worked tables below use that same engine. They are not a second formula and they do not look up a local price.
Start with the shape you are pouring
Each calculator keeps its own worked table. Pick the geometry in front of you instead of averaging a slab, a footing, and a post hole into one thickness.
Common slab sizes at the default allowanceConcrete Slab Calculator
The thickened-edge row uses a 12 in edge and 8 in of extra depth under a 4 in field. It is not a design recommendation.
Bag counts for small poursConcrete Bag CalculatorYields are 0.30, 0.45, and 0.60 ft³ for the 40, 60, and 80 lb columns. A different product label replaces these yields.
Fence and deck holesPost Hole Concrete CalculatorPost subtraction uses the diameter you enter. The calculator does not choose embedment or frost depth.
Round forms by diameter and fillSonotube Concrete CalculatorDiameter is the inside of the form. Reinforcement is not subtracted from the purchasing quantity.
Strip footing runsConcrete Footing CalculatorOrder quantity rounds the wasted volume up to 0.25 yd³. Confirm the supplier increment before you buy.
Walls with and without openingsConcrete Wall CalculatorOpening length and height are in feet. Thickness is in inches. Formwork and reinforcement are not included.
Round and square columns at the same nominal sizeConcrete Column CalculatorEnter the inside of the form. The calculator does not add formwork, steel, or excavation.
Where the bag load stops being a small jobReady-Mix vs. Concrete Bags CalculatorWeight is bag count times 80 lb. It is a handling figure, not a delivered price.
Order size before any dollar amountConcrete Cost CalculatorNo price in this table is a local quote. Enter supplier figures in Adjust assumptions before comparing invoices.
Six different shapes, one ordering methodConcrete CalculatorMixed shapes are totaled before rounding. Do not round each shape and then add the order numbers.
Read this before you call a supplier
Bags40, 50, 60, and 80 lb yields
See why rounding each small pad before the total adds an extra bag.
OrderWhat to say on the phoneMeasured volume, waste, and the supplier increment, in that order.
FeesDelivery lines that are not the yard priceShort-load, pump, waiting, and fuel stay blank until the quote names them.
CheckWhat to match on the supplier’s paperConfirm the unit, the increment, and that waste was not added twice.