Construction

Instant, private, and free

Concrete Tube Calculator.

Calculate annular tube volume and conversions.

On-device calculationNo signup
01

Set your values

Results update as you type.

outerRadius: 2

outerRadius

0.000
innerRadius: 1

innerRadius

0.000
crossSectionArea: 9.425

crossSectionArea

0.000
Volume: 94.248

Volume

0.000
Cubic yards: 3.491

Cubic yards

0.000
Cubic meters: 2.669

Cubic meters

0.000

Use Cases

Estimating concrete for tube forms

When pouring concrete into cylindrical forms (e.g., for deck footings or columns), this calculator helps estimate the required concrete volume based on the form's dimensions.

Example: A tube with 1 ft outer diameter, 0.5 ft inner diameter, and 10 ft length holds about 5.9 cubic feet of concrete.

Planning material for hollow pipes

For construction projects involving hollow concrete pipes or culverts, calculate the volume of concrete needed to fill the annular space between two diameters.

Example: Outer diameter 2 ft, inner diameter 1.5 ft, length 20 ft yields approximately 27.5 cubic feet.

Frequently Asked Questions

How do I use the Concrete Tube Calculator?
Enter the outer diameter, inner diameter, and tube length in feet. The calculator computes the annular volume (the space between the outer and inner circles) and provides conversions to other units like cubic yards or gallons.
What is an annular tube?
An annular tube is a hollow cylinder with a circular cross-section, like a pipe or a concrete form. Its volume is the difference between the volume of the outer cylinder and the inner cylinder.
Can I use this calculator for any unit?
This calculator specifically uses feet for all inputs. If your measurements are in other units, convert them to feet first to get accurate results.

Tips & Common Mistakes

Tips

  • Ensure all measurements are in feet before entering them. Convert inches to feet by dividing by 12.
  • The inner diameter must be less than the outer diameter; otherwise, the volume will be negative or zero.
  • For concrete ordering, add a waste factor (e.g., 10%) to the calculated volume to account for spillage or over-excavation.
  • Use the conversion results to compare with supplier units, such as cubic yards (1 cubic yard = 27 cubic feet).

Common Mistakes to Avoid

  • Mixing units: entering diameters in inches while length is in feet leads to incorrect volume.
  • Forgetting that the inner diameter is the diameter of the hollow space, not the radius.
  • Assuming the calculator accounts for wall thickness; it uses the difference between outer and inner diameters.

Last updated: August 13, 2026