Sonotube Calculator
Calculate the number of concrete bags needed for a sonotube column based on diameter and height.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Sonotube Calculator
This calculator estimates the number of 60lb concrete bags needed to fill a cylindrical sonotube (form).
- Enter Diameter (inches): Type the tube's inner diameter (e.g., 12 for a 12-inch tube).
- Enter Height (feet): Type the tube's height in feet (e.g., 4 for 4 feet).
- Click "Calculate": Press the button or hit Enter.
Output: You'll see the total number of 60lb bags required, plus the calculated volume in cubic feet.
Note: All inputs must be positive numbers. The formula uses imperial units (inches and feet).
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Frequently Asked Questions
A sonotube is a cylindrical cardboard form used to pour concrete columns or footings.
A 60lb bag of concrete mix typically covers about 0.45 cubic feet. Use 1/0.45 ≈ 2.22 bags per cubic foot.
The calculator accepts diameter in inches and converts to feet internally. Height should be in feet.