Calculate the exact volume, weight, and number of bags needed for circular or square concrete piers with live 3D visualization.
1. Select the shape of your pier (Circular or Square).
2. Enter the depth/height of the pier in feet.
3. Enter the diameter (for circular) or width/length (for square) in inches.
4. Specify the total number of piers you are pouring and your desired waste margin (10% is standard).
5. The results and 3D visualization will update automatically. Use the visual to verify your dimensions before downloading your report.
Circular Pier Volume: π × (Diameter ÷ 2)² × Depth
Square Pier Volume: Width × Length × Depth
Total Volume (cu yd): (Volume in cu ft × Quantity) ÷ 27
Weight: Total cu ft × 150 lbs/cu ft (standard concrete density)
Bags: Total cu ft ÷ 0.45 (for 60lb) or ÷ 0.60 (for 80lb)