How to use it
- Enter the tube’s inside diameter in inches.
- Enter the depth in feet.
- Set the number of tubes you plan to pour.
- Click “Calculate” to see cubic yards, 80‑lb bags, and cubic feet.
What it does – The Sonotube calculator turns the dimensions you input into three practical quantities: total cubic feet of concrete, the equivalent in cubic yards, and the number of standard 80‑lb bags required. Knowing these numbers before you order prevents over‑buying or shortfalls that can delay a project.
Why it matters – Concrete is heavy and expensive; ordering the right amount saves money and reduces waste. Contractors and DIY homeowners alike rely on accurate volumes to schedule deliveries and keep a job on time.
How to read the results – Cubic feet is the raw volume of the hole. Divide that by 27 to get cubic yards, the unit most suppliers quote. Finally, the calculator divides cubic feet by 0.6 ft³ per bag to tell you how many 80‑lb bags to purchase.
Pro tips
- Add 5‑10 % extra for spillage and settling.
- Round up bag count to the next whole bag.
- Order bags in multiples that match delivery truck capacities.
- Double‑check diameter measurement at the widest point of the tube.
Real-life examples
- A homeowner pouring a 12‑inch diameter, 3‑foot deep footing for a deck.
- A contractor estimating concrete for a row of 8‑inch Sonotubes in a new driveway.
- A landscaper filling multiple 10‑inch, 2‑foot deep decorative pillars.
Case study
Mike needed concrete for four 10‑inch, 4‑ft deep Sonotubes. Using the calculator he saw he required 2.3 cubic yards, which translated to 4 bags of 80‑lb mix. He ordered exactly that amount, avoided a $120 over‑order, and finished the project on schedule.