How to use it
- Enter the tube diameter in inches.
- Enter the depth in feet.
- Enter the quantity of tubes.
- Read the cubic yards, cubic feet, and 80‑lb bag totals.
The Sonotube Concrete Calculator takes the three inputs you already know—diameter, depth, and quantity—and instantly tells you three critical outputs: total cubic feet, cubic yards, and how many 80‑lb bags of mix you’ll need. Knowing the volume in cubic yards helps you communicate with suppliers, while the bag count lets you budget accurately. The calculator uses the standard conversion that one 80‑lb bag yields 0.6 ft³, and it converts cubic feet to cubic yards (1 yd³ = 27 ft³). After you enter your numbers, the results appear immediately, so you can adjust dimensions or quantity before you place an order, avoiding costly over‑ or under‑estimates.
Pro tips
- Add 5‑10% extra for waste and spillage.
- Round bag count up to the nearest whole bag; you can’t buy a fraction.
- Order a little more than the calculator shows to cover unexpected variations.
- Double‑check that the diameter is measured inside the tube, not the outer skin.
Real-life examples
- A homeowner planning a 12‑inch diameter, 8‑ft deep concrete footing for a deck.
- A contractor estimating materials for 15 Sonotube columns on a new patio.
- A DIYer ordering concrete for a raised garden bed using 6‑inch Sonotubes.
Case study
Mike needed concrete for ten 10‑inch Sonotubes, 6 ft deep. The calculator showed 13.3 yd³, 360 ft³, and 600 80‑lb bags. He ordered 610 bags, avoided a shortfall, and finished on schedule.