How to use it
- Enter the tube diameter in inches.
- Enter the depth in feet.
- Enter how many tubes you need.
- Read the cubic yards, cubic feet, and bag count.
The Concrete Sonotube Calculator turns the size of your footing into the exact amount of concrete you’ll need. You plug in the tube’s diameter (in inches), the depth you’re pouring (feet), and how many footings you’re building. The tool instantly returns three numbers: total cubic yards for ordering, cubic feet for on‑site checks, and the number of 80‑lb bags based on the constant that each bag yields 0.6 ft³. Knowing cubic yards helps you get accurate delivery quotes, while the bag count tells you how many packages to order, avoiding shortages or excess. The results are rounded up to the next whole bag because you can’t purchase a fraction of a bag. Use the figures to budget, schedule deliveries, and keep your project on track.
Pro tips
- Add 5‑10% extra volume for spillage and uneven subgrade.
- Always round up the bag count; you can’t buy a partial bag.
- Order bags in multiples of 10 to reduce shipping costs.
- Double‑check the diameter measurement; a small error multiplies across depth.
Real-life examples
- A homeowner building a 12‑in. concrete pier for a deck.
- A contractor estimating concrete for multiple fence post footings.
- A landscaper planning a series of 8‑in. tree stumps.
Case study
Mike needed 4 footings for a new deck. He entered 12 in diameter, 3 ft depth, quantity 4 and got 0.33 cubic yards, 9 cubic feet, and 15 bags. He ordered 15 bags, avoided a last‑minute run, and finished on schedule.