Sonotube Concrete Calculator
Calculate the amount of concrete needed for a cylindrical sonotube form. Enter the diameter and height to get the volume in cubic yards, cubic feet, and number of 80lb bags.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Sonotube Concrete Calculator
This calculator estimates the concrete volume needed for a cylindrical sonotube (column form) and the number of 80lb bags required.
- Enter Diameter (inches): Input the inside diameter of the sonotube in inches (e.g., 12 for a 12-inch tube). Must be greater than 0.
- Enter Height (feet): Input the height of the sonotube in feet (e.g., 4 for a 4-foot column). Must be greater than 0.
- Click "Calculate": Press the blue button or hit Enter on your keyboard.
Results shown:
- Cubic Yards: Total concrete volume in cubic yards (for ordering ready-mix).
- Cubic Feet: Volume in cubic feet (for reference).
- 80lb Bags: Number of 80lb bags needed (rounded up). Each bag yields 0.6 cubic feet.
Note: All inputs are in imperial units (inches and feet). The formula uses π × (radius in feet)² × height.
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Frequently Asked Questions
A sonotube is a cylindrical cardboard form used to create concrete columns or footings.
It provides a good estimate. Always order slightly more concrete to account for waste and spillage.
An 80lb bag yields about 0.6 cubic feet. For 60lb bags, use 0.45 cubic feet per bag. Adjust accordingly.