How to use it
- Enter the tube diameter in inches.
- Enter the depth in feet.
- Enter the number of tubes you need.
- Read cubic feet, cubic yards, and bag count results.
This tool lets you enter the Sonotube diameter, depth, and how many you need, then instantly shows the total concrete in cubic feet, cubic yards, and the number of 80‑lb bags required. Knowing the exact volume prevents ordering too much or too little, which saves money and avoids project delays. The calculator converts the cylinder volume you input into cubic feet, then divides by 27 to give cubic yards—a standard delivery unit. It also divides cubic feet by 0.6 to tell you how many 80‑lb bags to order. Read the results: cubic feet is the raw volume, cubic yards is what most suppliers quote, and bag count tells you how many bags to accurately place before you place on your order sheet.
Pro tips
- Add a 10% waste allowance to cover spillage and over‑fill.
- Round up the bag count to the next whole bag to ensure you have enough.
- Order bags in multiples of 5 for easier delivery and handling.
- Measure the inside diameter of the tube; using the outside size adds extra volume.
Real-life examples
- Homeowner building a 4‑ft fence post foundation with Sonotube columns.
- Contractor pouring footings for a deck that uses multiple Sonotube forms.
- DIY landscaper installing a garden retaining wall using Sonotube columns.
Case study
Mike needed three 12‑in Sonotubes 6 ft deep for a patio pier. Using the calculator he saw he required 2.9 cubic yards, which translates to 135 bags. He ordered 140 bags, avoided a last‑minute shortage, and finished on schedule.