Concrete Tube Calculator
Calculate concrete needed for cylindrical forms, sonotubes, and other tubular concrete forms for posts, columns, and piers.
Calculate Your Concrete Tube Calculator
Tube Dimensions
Concrete form tubes (also known as Sonotubes, cardboard forms, or concrete tubes) are used to create cylindrical concrete structures such as columns, piers, fence posts, and deck footings. Properly estimating the concrete needed for these forms helps ensure you have enough material for your project.
This calculator helps you determine the volume of concrete needed based on the diameter and height of your form tubes, helping you avoid costly overages or shortages.
How to Use This Calculator
- Select a standard tube size or choose "Custom Size" to enter your own dimensions
- Enter the height (or length) of the tube in feet
- Specify how many identical tubes you need to fill
- Choose whether to include a waste factor for additional material
- Click "Calculate Concrete Requirements" to get your results
Common Applications
- Deck Footings: Typically use 8"-12" diameter tubes depending on the load requirements
- Structural Columns: Often require 12"-24" diameter tubes based on engineering requirements
- Fence Posts: Usually use 8"-10" diameter tubes for stability
- Light Posts: Commonly use 10"-12" diameter tubes depending on post height
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Frequently Asked Questions
For standard residential deck posts, an 8-12 inch diameter tube is typically sufficient. Larger decks, especially those with multiple stories, may require wider tubes (14-16 inches). Always check local building codes for specific requirements.
Concrete tubes should extend below the frost line in your area to prevent frost heave. In many regions, this means at least 36-48 inches deep. The tube should also extend 6-8 inches above grade to keep the wooden post away from ground moisture.
Yes, it's recommended to place 4-6 inches of compacted gravel at the bottom of the tube before pouring concrete. This helps with drainage and provides a solid base for the concrete.
For most applications, you can remove the tube form after the concrete has cured for 48-72 hours. However, in colder weather, you may need to wait longer. Some contractors leave cardboard forms in place as they will naturally deteriorate over time.
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