Add up the piers under a pier and beam home.
⚙️Calculation Parameters
📊Calculated Output
How Pier-and-Beam Concrete Calculator Works?
To estimate a pier-and-beam foundation, the Pier-and-Beam Concrete Calculator builds the pier grid from the building footprint and spacing, then totals the concrete. The process takes 4 steps.
Enter the footprint
Type the building width and length in feet (ft) or meters (m).
Enter pier spacing
Type the grid spacing in each direction, commonly 6 ft to 8 ft (1.8 m to 2.4 m).
Enter pier size
Type the tube diameter and depth, or set perimeter and interior piers to different sizes.
Read the grid
The calculator counts piers, totals the concrete and recommends bags or ready-mix.
Pier-and-Beam Concrete Calculator Formula
The Pier-and-Beam Concrete Calculator multiplies a pier grid by the pier volume.
Pier rows
r = ⌊W ÷ s⌋ + 1 and c = ⌊L ÷ s⌋ + 1W, L footprint and s spacing.
Pier count
n = r × cGrid of piers.
Concrete
V = n × π × (D ÷ 24)² × (H ÷ 12)Cubic feet (ft³).
Worked example: 16 × 32 ft tiny home, 8 ft grid, 12 in × 48 in piers
- r = 16 ÷ 8 + 1 = 3 and c = 32 ÷ 8 + 1 = 5, so n = 15
- V = 15 × 3.142 = 47.1 ft³ (1.75 yd³)
- With 10%: 1.92 yd³ → ready-mix order of 2.00 yd³
Pier-and-Beam Concrete Calculator Conversion Table
The pier-and-beam conversion table lists the pier grid and concrete for 5 building footprints.
| Building | Pier grid | Pier size | Net ft³ | Net yd³ | yd³ + 10% |
|---|---|---|---|---|---|
| 12 × 16 ft shed | 9 piers (3 × 3) | 10 in × 36 in | 14.7 | 0.55 | 0.60 |
| 12 × 24 ft cabin | 15 piers (3 × 5) | 12 in × 42 in | 41.2 | 1.53 | 1.68 |
| 16 × 32 ft tiny home | 15 piers (3 × 5) | 12 in × 48 in | 47.1 | 1.75 | 1.92 |
| 24 × 40 ft modular | 24 piers (4 × 6) | 16 in × 48 in | 134.0 | 4.96 | 5.46 |
| 28 × 48 ft house | 28 piers (4 × 7) | 16 in × 48 in | 156.4 | 5.79 | 6.37 |
Spacing depends on beam size and building load. Follow the foundation design.
What is Pier-and-Beam Concrete Calculator?
A Pier-and-Beam Concrete Calculator is a foundation calculator that totals the concrete piers under a building raised on beams.
Pier-and-beam foundations hold a floor above grade on a grid of piers and beams. They suit sloped lots, flood zones, cabins, sheds and modular homes. The calculator turns the footprint and spacing into a pier count, then into a concrete order. A 24 × 40 ft modular on an 8 ft grid needs 24 piers.
Larger jobs pass 1 yd³ fast. The calculator flags when ready-mix beats bagged concrete.
What are the uses of Pier-and-Beam Concrete Calculator?
There are 4 main uses of the Pier-and-Beam Concrete Calculator.
Cabins and tiny homes
Builders size pier grids for small raised buildings.
Sheds
Owners place sheds on piers instead of a slab.
Modular homes
Contractors total piers for factory-built homes.
Flood-zone builds
Designers raise floors on pier grids.
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