Get the concrete for porch piers.
⚙️Calculation Parameters
📊Calculated Output
How Porch Pier Concrete Calculator Works?
To estimate porch piers, the Porch Pier Concrete Calculator totals the piers under porch posts and columns and lists the concrete and bags. The process takes 4 steps.
Enter post count
Type the number of porch posts or columns, including corners.
Enter pier sizes
Type the diameter and depth. Covered porches carry roof loads and often need larger piers than open decks.
Add step piers
Enter extra piers under stair stringers, if the design calls for them.
Read the order
The calculator lists concrete in cubic feet (ft³) and cubic yards (yd³), bags and pier weight.
Porch Pier Concrete Calculator Formula
The Porch Pier Concrete Calculator totals porch piers.
Porch concrete
V = Σ nᵢ × π × (Dᵢ ÷ 24)² × (Hᵢ ÷ 12)Column piers plus step piers.
Roof load per post
P = roof area ÷ posts × roof loadPounds (lb) per post.
Bearing check
q = P ÷ (π × (D ÷ 24)²)Pressure under the pier in psf.
Worked example: covered porch, 6 posts at 14 in × 48 in
- V = 6 × 4.276 = 25.66 ft³ (0.950 yd³)
- With 10%: 48 bags of 80 lb
- Bearing area per pier = 1.07 ft² (0.099 m²)
Porch Pier Concrete Calculator Conversion Table
The porch pier conversion table lists concrete, bags and total pier weight for 5 porch layouts.
| Porch | Pier | Net ft³ | Net yd³ | 80 lb bags (+10%) | Pier weight lb |
|---|---|---|---|---|---|
| Front stoop, 2 columns | 12 in × 42 in | 5.50 | 0.204 | 11 | 797 |
| Small porch, 4 posts | 12 in × 42 in | 11.00 | 0.407 | 21 | 1,594 |
| Portico, 2 heavy columns | 16 in × 48 in | 11.17 | 0.414 | 21 | 1,620 |
| Wraparound porch, 10 posts | 12 in × 48 in | 31.42 | 1.164 | 58 | 4,555 |
| Covered porch, 6 posts | 14 in × 48 in | 25.66 | 0.950 | 48 | 3,720 |
Covered porches tie into the house roof. Pier sizes follow the porch design and local code.
What is Porch Pier Concrete Calculator?
A Porch Pier Concrete Calculator is a porch-specific calculator that totals the concrete piers under porch posts, columns and steps.
Porches carry a roof as well as a floor, so their piers see heavier loads than deck piers of the same size. Porch columns are fewer and wider spaced, which concentrates load. The calculator sizes the concrete for each column pier and adds step piers.
A 6-post covered porch on 14 in × 48 in piers needs 48 bags of 80 lb mix with a 10% margin.
What are the uses of Porch Pier Concrete Calculator?
There are 4 main uses of the Porch Pier Concrete Calculator.
Covered porches
Builders size piers under roof-bearing posts.
Porticos and stoops
Contractors size piers under 2 entry columns.
Porch rebuilds
Crews replace rotted brick or block piers.
Step supports
Installers add piers under stair stringers.
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