Get the concrete for your deck piers.
⚙️Calculation Parameters
📊Calculated Output
How Deck Pier Concrete Calculator Works?
To estimate deck piers, the Deck Pier Concrete Calculator multiplies the pier size by the pier count from your deck plan and adds rebar, gravel and bags. The process takes 4 steps.
Enter the pier layout
Type the number of piers from the beam layout, such as 3 beams × 3 posts = 9 piers.
Enter pier size
Type the tube diameter and the depth below frost plus the reveal above grade.
Pick extras
Choose the bag size, the gravel depth and the vertical bars per pier.
Read the materials
The calculator lists concrete in cubic feet (ft³) and cubic yards (yd³), bags, rebar and gravel.
Deck Pier Concrete Calculator Formula
The Deck Pier Concrete Calculator combines pier volume with deck layout math.
Pier count
n = beams × posts per beamFrom the framing plan.
Concrete
V = n × π × (D ÷ 24)² × (H ÷ 12) × (1 + w)All piers with waste.
Tributary load
P = deck area ÷ n × design loadLoad per pier in pounds (lb); sizes the pier.
Worked example: 12 × 16 ft deck, 9 piers at 12 in × 42 in
- V = 9 × 2.749 = 24.74 ft³
- With 10%: 27.21 ft³ → 46 bags of 80 lb
- Load per pier ≈ 192 ft² ÷ 9 × 50 psf = 1,067 lb (484 kg)
Deck Pier Concrete Calculator Conversion Table
The deck pier conversion table lists concrete, bags and #4 rebar bar counts for 5 typical deck layouts.
| Deck | Piers | Net ft³ | Net yd³ | 80 lb bags (+10%) | #4 bars (4 per pier) |
|---|---|---|---|---|---|
| 8 × 10 ft platform | 4 × 10 in × 42 in | 7.64 | 0.283 | 14 | 16 |
| 10 × 12 ft deck | 6 × 10 in × 42 in | 11.45 | 0.424 | 21 | 24 |
| 12 × 16 ft deck | 9 × 12 in × 42 in | 24.74 | 0.916 | 46 | 36 |
| 16 × 20 ft deck | 12 × 12 in × 48 in | 37.70 | 1.396 | 70 | 48 |
| Two-story 12 × 20 ft | 8 × 16 in × 48 in | 44.68 | 1.655 | 82 | 32 |
Pier size and spacing come from the deck design and local code. The 50 psf (pounds per square foot) load is a common combined live and dead load for residential decks.
What is Deck Pier Concrete Calculator?
A Deck Pier Concrete Calculator is a deck-specific concrete calculator that estimates pier concrete, bags, rebar and gravel from the deck pier layout.
Deck piers carry the beams that carry the joists. Their size depends on the load each pier supports and the soil below it. A 12 × 16 ft deck on 9 piers puts about 1,067 lb on each pier at a 50 psf design load. The calculator sizes the concrete for that layout.
The tool works for freestanding decks and ledger-attached decks, where one row of piers is replaced by the house rim.
What are the uses of Deck Pier Concrete Calculator?
There are 4 main uses of the Deck Pier Concrete Calculator.
Deck material lists
Builders get concrete, bags, rebar and gravel in one list.
Permit drawings
Owners show pier sizes and counts on a deck permit.
Bid pricing
Contractors price the footing stage of a deck job.
Load checks
Designers estimate load per pier from deck area.
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