Concrete Calculator
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Project type
Slab (patio, floor, driveway)
Footing (wall, fence, shed)
Post hole (round)
Sonotube / round column
Stairs (risers + treads)
Curb / gutter / stem wall
Bag size to estimate
60 lb bags (0.45 cu ft yield)
80 lb bags (0.60 cu ft yield)
Subgrade / form complexity
Clean (level subgrade, rigid forms) — 10% waste
Typical residential — 15% waste
Rough (soft soil, uneven forms) — 20% waste
Slab length
ft
Slab width
ft
Slab thickness
in
Footing length
ft
Footing width
in
Footing depth
in
Hole or tube diameter
in
Hole or tube depth/height
ft
Number of holes / tubes
Stair width
ft
Tread run
in
Riser height
in
Number of steps
Length
ft
Height
in
Thickness
in
You need
Concrete volume
1.36 cu yd
33.33 cu ft + 10% waste
60 lb bags
82 bags
60 lb bag yields 0.45 cu ft
Ready-mix truck
Order 2.00 cu yd
Most suppliers require a 3 cu yd minimum. Below that, expect a $50-200 short-load fee — or ask for a volumetric (mobile-mix) truck which delivers as little as 0.5 yd.
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