Concrete Depot Concrete Calculators & Tools

Concrete Deck Footing Calculator

Estimate concrete for deck post footings, round piers, square pads, and bell footings. Get total volume, bag count, material cost, and a printable report with a 3D measurement diagram.

Measurement inputs

Live calculation updates as you type.

Deck footings
Used in the saved report.
Changes starter units only.
Shape changes the volume formula.
Deck posts or piers to pour. Enter at least 1 footing.
Common deck pier diameters are 10–18 in. Enter a diameter greater than 0.
Used for square and rectangular pads. Enter a width greater than 0.
Hidden for square footing mode. Enter a length greater than 0.
Use local frost depth where required. Enter a concrete depth greater than 0.
Use 0 if concrete stops at grade. Above-grade height cannot be negative.
Bottom diameter of the enlarged base. Enter a bell diameter greater than the pier diameter.
Modeled as a flared frustum. Enter a bell depth from 0 to total depth.
Shown as excavation depth, not concrete. Gravel depth cannot be negative.
Use 5–15% for most pours. Waste cannot be negative.
Usually use volume with waste.
Optional material-only estimate. Cost cannot be negative.
For simple bearing pressure check only. Load cannot be negative.
Used only when load is entered. Enter a soil value greater than 0.

Live 3D deck footing preview

The same SVG is used in the report.

Round pier
Footing size —
Concrete depth —
Footings —
Order quantity with waste
—

Enter values to calculate deck footing concrete.

For planning only. Deck footings may be controlled by frost depth, local code, soil conditions, uplift, lateral load, post base hardware, reinforcement, and engineered plans.
Base concrete—
Concrete per footing—
Footing footprint—
40 lb bags—
60 lb bags—
80 lb bags—
Estimated material cost—
Total excavation depth—
Bearing pressure check—
Formula used
Round pier volume = π × radius² × depth × quantity

All dimensions are converted to feet before concrete volume is calculated.

Calculation steps
  1. Enter valid measurements to see the steps.