Two column shapes
Calculates circular or rectangular cross sections.
Choose round or rectangular columns, enter the count and dimensions, and calculate net volume, concrete order quantity, and estimated bags.
Round column volume = pi x (diameter / 2)^2 x height x count; rectangular column volume = width x depth x height x count.
Calculates circular or rectangular cross sections.
Multiplies one-column geometry by the entered count.
Adds waste and converts volume into whole bags using editable yield.
Select the column shape and enter the number of identical columns. For round columns, the calculator uses diameter and ignores the rectangular width and depth fields. For rectangular columns, it uses width and depth and ignores diameter. Imperial height is entered in feet while cross-section dimensions are inches; metric height is meters and cross-section dimensions are centimeters.
Use actual concrete dimensions rather than nominal tube, block or form names. Calculate groups separately when height or cross section changes. This page estimates full solid geometry; it does not subtract reinforcement and does not include bases, capitals, beams, footings, pedestals or embedded voids unless those volumes are calculated separately.
Tall or narrow placements require planning for form pressure, access, lift height, consolidation, segregation control and placement rate. Column size, reinforcement, cover, concrete specification, bracing, formwork and construction sequence are safety-critical design matters. Follow approved drawings, code requirements, product instructions and qualified professional direction.
| Input | What it means | Planning note |
|---|---|---|
| Shape | Round or rectangular cross section | Only the relevant dimension fields are used. |
| Count and height | Number of identical columns and concrete height | Split varying columns into separate calculations. |
| Diameter or width/depth | Cross-section dimensions | Measure the actual inside form dimensions. |
| Waste and bag yield | Order allowance and product output | Confirm supplier and manufacturer values. |
Estimate concrete for identical cylindrical placements.
Calculate designed column or pier geometry.
Plan volume for formed posts and structural columns.
Multiply pi by radius squared and height, then multiply by the number of columns and add waste.
No. Enter the full inside diameter; the calculator divides it by two to obtain radius.
Calculate each size group separately and add the order volumes.
No. Calculate pads or footings separately with the appropriate geometry.
Last reviewed: August 26, 2026. Results estimate geometric volume only; confirm dimensions, reinforcement, mix, code requirements, and order quantity with qualified professionals and suppliers.
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