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Concrete Calculator for Yards, Bags & Cost

By Nick Major · Founder, Calculator Campus Last updated June 29, 2026

Use this concrete calculator to estimate a pour before you order ready-mix or buy premix bags. Enter the project shape, dimensions, quantity, and overage. The calculator returns cubic yards, cubic feet, cubic meters, rounded-up bag counts, estimated weight, and optional material cost. If you already have bags on hand, switch modes to see how much slab area they can cover at your chosen thickness.

Start with project dimensions for a ready-mix or bag estimate. Switch to Bags on Hand when you already own bags and want to know how much area they can cover.

Calculation mode

Choose dimensions-to-volume for a project estimate, or bags-on-hand to work backward from an existing bag inventory.

Primary output 1.36 cu yd
Imperial uses feet and inches; metric uses meters and centimeters for thickness/diameters.
Length in feet or meters.
Slab width in feet/meters; strip-footing width in inches/centimeters.
Slab thickness or footing depth. Use inches in imperial mode or centimeters in metric mode.
Used for bag counts, bag-cost mode, and bags-on-hand coverage.
How many premix bags you already have.
Thickness for bags-on-hand coverage, in inches.
Advanced options
Cost — Weight 5,000 lb Warnings —
Optional named project starting point. Preset buttons above can fill the same values faster.
Pick the geometry that matches the pour.
Round-column or post-hole diameter in inches or centimeters.
Column height, post-hole depth, or tube length in feet/meters.
Tube outer diameter in inches or centimeters.
Tube inner diameter; must be smaller than the outer diameter.
Number of identical slabs, columns, holes, or footing runs.
Extra concrete added before order quantity and bag count. 10% is a common residential starting point.
Choose whether optional cost uses cubic yards of ready-mix or rounded-up premix bags.
Optional ready-mix material price for cost estimates.
Optional bag price for cost estimates.
Normal-weight concrete is commonly estimated around 150 lb per cubic foot.
Answer 1.36 cu yd
Concrete volume 1.23 cu yd
Order volume with overage 1.36 cu yd
Selected bag count 62 × 80 lb bags
Estimated material cost —
Show calculation details
Cubic feet 33.33 cu ft
Cubic meters 0.94 m³
40 lb bags 123
60 lb bags 82
80 lb bags 62
Estimated weight 5,000 lb
Notes —

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Turn the concrete result into an order check

Before buying bags or calling a ready-mix supplier, use these checks to make sure the estimate matches the actual pour conditions and ordering constraints.

Confirm the geometry

Measure the formed area after excavation and base preparation, not just the plan dimensions. Uneven subgrade depth, thickened edges, and repeated post holes can change the cubic-yard result enough to matter at order time.

Match the buying method

Use ready-mix pricing when you are ordering by the cubic yard and bag pricing when you plan to buy premix. Compare the material subtotal with delivery fees, minimum-load charges, equipment rental, and the labor needed to place the concrete before it sets.

References

  1. https://www.concretenetwork.com/concrete/howmuch/calculator.htm

  2. https://www.quikrete.com/calculator/main.asp

  3. https://www.cemexusa.com/ready-mix-concrete-calculator

  4. https://www.sakrete.com/concrete-calculators/

Frequently asked questions

How many cubic feet are in a cubic yard of concrete?
There are 27 cubic feet in one cubic yard. Ready-mix suppliers in the United States usually quote and dispatch concrete by the cubic yard.
How much extra concrete should I order?
A 10% overage is a common starting point for residential estimates. Complex forms, uneven subgrades, and small hand-mixed jobs may need more judgment.
Can this tell me how many bags I need?
Yes. The calculator converts the order volume into whole bag counts using the selected premix bag weight and typical bag yields.

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