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Concrete slab, footing and pier volume

Cubic yards of concrete and the number of 60 or 80 lb bags for slabs, footings or round piers.

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ShapeRectangular uses length x width x thickness; round uses diameter x height.Length (or pier height) (ft)Slab or footing length; for a pier, its height.Width (ft)Rectangular shapes only.Thickness (in)Slab thickness or footing depth; 4 in is common for patios.Pier diameter (in)Round shapes only; sonotubes come in 8, 10, 12, 16 in and up.Number of pours alikeIdentical slabs, footings or piers.Waste and over-excavation (%)5–10% covers uneven subgrade and spillage.Bag size80 lb yields about 0.60 cu ft; 60 lb about 0.45 cu ft.

For the order and cost7 more, filled with typical values

Ready-mix price ($ per CY)Delivered price per cubic yard from the plant's quote, before any short-load fee.Short-load threshold (CY)Orders under this size pay the plant's short-load fee. Ask the dispatcher; 0 if there isn't one.Short-load fee ($)Flat fee the plant adds to a small order.Bag price ($ per bag)Price of one bag of the size you picked above.Bags your crew mixes and places (bags an hour)Time your own crew with the mixer you use. This sets the labor for the bag option.Crew cost ($ per hour)The whole crew's hourly cost, wages and burden.Gravel base under the slab (in)Depth of stone or sand base. 0 skips it. Not used for piers.

Concrete slab, footing and pier volumeForge by Norventus

How it works

Press Calculate to see the volume, the cubic yards and the bags.

Concrete: in the form and in the yardage gaugeTruck, form, gauge and the bags countedThe drawing follows your numbers as you type: a slab or footing form, or a tube form for a round pier. Press Calculate and the truck pours it full; the volume, the cubic yards and the bags appear here, worked out by the tool, and the gauge and the pallet follow them.

Result

Ready when you are.Enter your numbers and press Calculate.

References

Check the work against these

The ready-mix order, the cost of ready-mix against bags and crew time, the base, vapor retarder and forms, and the checks before the pour, with sources. Numbers in the result and in the plain-words read point here.

1
Quikrete Concrete Mix (No. 1101) data sheetData
Quikrete
The bag yields this sheet uses: an 80 lb bag makes about 0.60 cu ft, plus the mixing water and curing directions printed on the bag.
2
IRC 2021, Chapter 5 Floors (R506 concrete floors on the ground)Code
International Code Council
R506.1: a slab-on-ground floor at least 3-1/2 in thick; R506.2.2: a 4 in base of clean sand or gravel where needed; R506.2.3: the vapor retarder under the slab (6 mil in the 2018 IRC, 10 mil ASTM E1745 Class A in 2021). Check your adopted edition.
3
ASTM C94/C94M, Standard Specification for Ready-Mixed ConcreteCode
ASTM International
What the delivery ticket must show and the 1-1/2 hour limit from batching to discharge, unless the purchaser waives it.
4
Concrete in Practice (CIP) sheetsHandout
National Ready Mixed Concrete Association
One-page field sheets for ordering and placing: CIP 6 joints in slabs, CIP 11 curing, CIP 14 finishing flatwork, CIP 27 cold weather.
5
ACI CODE-318-19(22), Building Code Requirements for Structural ConcreteCode
American Concrete Institute
Strength-test frequency for structural concrete (26.12): at least once a day per mix and once per 150 cu yd. Applies when the drawings call for tested concrete.

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Pro sheetPremiumConcrete pour plannerTruck loads, pour duration, truck spacing and trucks in rotation for a ready-mix pour.In the role plan · see an example →Pro sheetPremiumRebar count and weightBars each way, linear feet, 20 ft sticks and weight for a rebar mat in a slab.In the role plan · see an example →

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Concrete slab, footing and pier volume

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