Column Concrete Calculator
This column concrete calculator finds the concrete volume for a column from its cross section and height. Enter a round diameter or the rectangular sides, plus the height, and the column concrete calculator returns the volume in cubic meters. As a circular concrete calculator it handles round columns, and it covers square and rectangular columns too.
Results
The Column Concrete Calculator is part of our Concrete collection. Browse more concrete to size, convert, and check your work alongside this tool.
What the column concrete calculator shows
A column is a vertical concrete member, and the column concrete calculator finds how much concrete it takes. It works out the cross section area, from a diameter for a round column or the sides for a rectangular one, then multiplies by the height. As a circular concrete calculator it uses the circle area for round columns, so you get the volume in cubic meters for one column or a set.
How the column concrete calculator finds volume
The column concrete calculator multiplies the cross section area by the height:
For a round column, the circle area is pi times the radius squared, which is the circular column concrete formula. For a rectangular column, the area is the two sides multiplied. Multiplying by the height gives the volume, so the column concrete calculator returns cubic meters for the pour.
Column concrete calculator example
A round column 400 mm across and 3 m tall. The column concrete calculator applies the circular column concrete formula:
So the column needs about 0.38 cubic meters of concrete. A 300 by 300 mm square column 3 m tall comes out at 0.27 m³. Change the size and the column concrete calculator updates the volume at once.
How to use the column concrete calculator
Choose round or rectangular, enter the diameter or the two sides in millimeters, and the height in meters, then the column concrete calculator returns the concrete volume. For several identical columns, multiply the single volume by the count. This concrete calculator for round columns uses the diameter to build the circle area, so enter the finished column size, not the formwork.
Reading the column concrete calculator result
The volume in cubic meters is what you order concrete by, whether mixed on site or delivered ready mix. Add a small allowance for spillage and over excavation, and round up to the nearest quarter meter for a ready mix order, since part loads still cost. For several columns, multiply by the count and order in one pour where you can. The column concrete calculator gives the concrete only, not the rebar cage inside the column, which is a separate takeoff.
When to use the circular concrete calculator
- Pouring round columns with the circular concrete calculator
- Finding the circular column concrete quantity for an order
- Sizing square or rectangular columns by volume
- Estimating a set of pillars with a concrete pillar calculator
Common column concrete calculator mistakes
- Using diameter as radius. The circle area needs the radius, half the diameter, squared after halving.
- Entering formwork size. Use the finished column dimension, not the outside of the shutter.
- Forgetting waste. Add a little for spillage and round up ready mix orders.
Tips for column pours
- Halve the diameter to the radius before squaring for round columns.
- Multiply one column volume by the count for a set.
- Round up ready mix orders and pour together where you can.
Circular column concrete formula
The circular column concrete formula is the volume of a cylinder: the circle area, pi times the radius squared, times the height. The one place people slip is the radius, since columns are quoted by diameter, so the radius is half the diameter and must be squared after halving, not before. Because the area depends on the radius squared, a small rise in diameter adds a lot of concrete: a 600 mm column holds four times the concrete of a 300 mm column at the same height, not twice. That is why the circle column concrete formula rewards checking the diameter carefully, and why a concrete calculator for round columns is worth using rather than estimating, especially across many columns where a small per column error multiplies.
Round column concrete quantity and formula
Working out round column concrete quantity for a job means repeating the formula across every column and summing, then adding for waste. Order in one pour where the schedule allows, since ready mix has a minimum charge and part loads waste money. Formwork sets the finished size, so enter the internal tube or box dimension, not the outside of the shutter. Reinforcement runs up the middle as a cage of vertical bars and ties, but it displaces so little concrete that the round column concrete formula ignores it for volume. For the steel itself, the rebar calculator lays out the bars and spacing, so pair it with this column concrete calculator to order both the concrete and the cage.
Circular column concrete quantity chart
Concrete volume for a round column 3 m tall by diameter, a quick circular column concrete quantity reference:
| Diameter | Cross section | Volume (3 m tall) |
|---|---|---|
| 300 mm | 0.071 m² | 0.212 m³ |
| 400 mm | 0.126 m² | 0.377 m³ |
| 450 mm | 0.159 m² | 0.477 m³ |
| 600 mm | 0.283 m² | 0.848 m³ |
Column Concrete Calculator FAQ
What is the circular column concrete formula?
The circular column concrete formula is volume = π × radius² × height, the circle area times the height. The column concrete calculator applies it for round columns.
How do I find round column concrete quantity?
Take pi times the radius squared for the area, then multiply by the height. For a 400 mm column 3 m tall that is about 0.38 m³, the round column concrete quantity this tool returns.
Does it work for square columns?
Yes. Choose rectangular and enter the two sides; the column concrete calculator multiplies the sides by the height, so square and rectangular columns work too.
Does the volume include rebar?
No. This gives the concrete volume only. The steel cage is a separate takeoff, since rebar displaces very little of the concrete.