Get the concrete for pergola piers.
⚙️Calculation Parameters
📊Calculated Output
How Pergola Pier Concrete Calculator Works?
To estimate pergola piers, the Pergola Pier Concrete Calculator totals the post piers, adds post anchor embedment and lists the bags. The process takes 4 steps.
Enter the pergola size
Type the footprint and post count, usually 4, 6 or 8 posts.
Enter pier size
Type the tube diameter and depth. Freestanding pergolas resist wind uplift and often use 12 in to 16 in tubes.
Pick the post anchor
Choose a wet-set or bolt-down post base, and the anchor embedment in inches.
Read the order
The calculator lists concrete, bags, anchors and the volume displaced by any embedded post.
Pergola Pier Concrete Calculator Formula
The Pergola Pier Concrete Calculator totals piers by post count.
Pier concrete
V = n × π × (D ÷ 24)² × (H ÷ 12)n = post count.
Embedded post
V_post = n × w² × E ÷ 1,728For posts set into the concrete top.
Uplift weight
W = V × 145 lb/ft³Pier dead weight that resists wind uplift.
Worked example: 12 × 16 ft pergola, 6 piers at 12 in × 48 in
- V = 6 × 3.142 = 18.85 ft³
- With 10%: 20.73 ft³ → 35 bags of 80 lb
- Dead weight per pier = 3.142 × 145 = 456 lb (207 kg)
Pergola Pier Concrete Calculator Conversion Table
The pergola conversion table lists concrete and bags for 5 pergola layouts, net of 6×6 posts set 4 in into the pier top.
| Pergola | Pier | Net ft³ | Net yd³ | 80 lb bags (+10%) | Post anchors |
|---|---|---|---|---|---|
| 10 × 10 ft, 4 posts | 12 in × 42 in | 10.72 | 0.397 | 20 | 4 |
| 12 × 12 ft, 4 posts | 12 in × 48 in | 12.29 | 0.455 | 23 | 4 |
| 12 × 16 ft, 6 posts | 12 in × 48 in | 18.43 | 0.683 | 34 | 6 |
| 14 × 20 ft, 6 posts | 16 in × 48 in | 33.09 | 1.226 | 61 | 6 |
| Freestanding 16 × 24 ft, 8 posts | 16 in × 48 in | 44.12 | 1.634 | 81 | 8 |
Wind uplift sizing depends on local wind speed and the roof cover. Follow the pergola design.
What is Pergola Pier Concrete Calculator?
A Pergola Pier Concrete Calculator is a pergola-specific calculator that totals the concrete piers under pergola posts, with anchors and bag counts.
Pergolas have few posts and an open roof that catches wind. Each pier carries roof weight down and holds the post against uplift. A 12 in × 48 in pier weighs about 456 lb (207 kg), which adds to the uplift resistance of the anchor. The calculator reports that weight next to the concrete quantity.
Pergolas attached to a house have fewer piers than freestanding ones. The calculator handles both.
What are the uses of Pergola Pier Concrete Calculator?
There are 4 main uses of the Pergola Pier Concrete Calculator.
Backyard pergolas
Owners size piers for 4-post kits.
Freestanding shade
Builders size larger piers for wind exposure.
Pergola kits
Installers match pier size to kit instructions.
Anchor planning
Crews order one post base per pier.
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