Concrete Column Calculator
Estimate the fill volume of a measured circular column form from its internal diameter and height. This is quantity arithmetic, not column design.
Reference calculation or estimate for example inputs; assumptions and limitations apply.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Internal diameter (m) | Enter internal diameter in m; use the same basis as the other measurements. |
| Height or depth (m) | Enter height or depth in m; use the same basis as the other measurements. |
| Extra volume allowance (%) | Enter percentage units: 5 means 5%, not a fraction of 0.05. |
Understanding your result
The answer estimates quantity, coverage or cost from the dimensions and allowances you entered. It does not size a structural member, assess capacity or determine installation adequacy.
Common mistakes
- Mixing centimetres with metres, or outside dimensions with the actual filled volume.
- Treating allowance, compaction, supplier yield and density as interchangeable adjustments.
Check your calculation
- Measure independently, subdivide irregular shapes, and compare supplier pack/yield information with the units used here.
Calculation checks, sources and review limits
What volume of concrete fills my measured circular column form?
Estimate the fill volume of a measured circular column form from its internal diameter and height. This is quantity arithmetic, not column design.
Common uses
- What volume of concrete fills my measured circular column form
- Check cylinder volume and volume with allowance using the actual inputs shown.
How it works
Use the measured internal form diameter and fill height. Multiply pi by radius squared and height to calculate the cylindrical void to be filled, then apply the chosen extra-volume percentage. External form diameter and nominal structural dimensions can describe a different volume. The calculator does not select a column diameter, reinforcement or load capacity.
Worked example
Enter Internal diameter: 2 m; Height or depth: 1 m; Extra volume allowance: 0 %. Results: Cylinder volume: 3.141592653589793 m³; Volume with allowance: 3.141592653589793 m³.