CrewMeasure.com

Concrete Calculator

Estimate concrete volume for footings, slabs, and round piers.

Switch between rectangular and round pours, add waste, and optionally convert the result into 60 lb or 80 lb bag counts.

Material List
Order 0.41 cu yd of concrete for this pour.

Pour shape

Switch between slab and footing rectangles or round piers.

LengthWidthDepth
Shape
Bag estimate

Turn this off if you're buying ready-mix by the truck instead of bagged concrete.

Dimensions

Type a plain number in feet, or tape-measure notation like 10' 6-3/4".

Bag size

Mix ratio

Optional — enter all three parts (e.g. the standard 1:2:4 cement:sand:gravel) to break the total volume into component volumes. Leave any part blank to skip.

Rebar grid

Optional — enter a spacing and bar size to compute a rebar grid's linear footage and weight for this rectangular pour.

Order 0.41 cu yd of concrete for this pour.

Order

Concrete estimate

Waste-adjusted concrete
0.41 cu yd

Actual: 0.40740740740740744 cu yd (rounded to nearest for purchase)

Bag count
21 bags

Warnings

  • INFO Material estimate only. Footing depth, size, reinforcement, frost depth, and bearing capacity must be verified locally.

Detail values

Cubic feet
10
Cubic yards
0.37
Waste-adjusted cubic yards
0.41
Bag count
21
Effective depth (incl. frost line)
0.5 ft

Assumptions

  • Concrete density for bag estimate: 4050 lb per cubic yard
  • Bag mode enabled: Yes

Included: concrete volume, waste allowance.

Not included: labor, delivery, permits, disposal, compaction (enter your intended post-compaction depth/volume — this estimate does not account for compaction itself), rebar and forms.

Formula details
  • Rectangular volume: length x width x depth
  • Round volume: pi x radius^2 x depth
  • Cubic yards: cubicFeet / 27
  • Bag count: ceil((wasteAdjustedCubicYards x 4050) / bagSize)

FAQ

Can I estimate sonotube piers here?

Yes. Use the round mode, enter diameter and depth, and the calculator returns cubic feet, yards, and optional bag counts.

Why is there a local verification warning?

Concrete quantity alone does not verify footing design, reinforcement, frost depth, or bearing capacity.

Are bag counts based on waste-adjusted volume?

Yes. The bag estimate uses the waste-adjusted cubic-yard total before rounding up to full bags.

Disclaimer

Material estimate only. Footing depth, size, reinforcement, frost depth, and bearing capacity must be verified locally.