How to use it
- Enter the tube diameter in inches.
- Enter the depth in feet.
- Enter the quantity of tubes you need.
- Read the cubic yards, 80‑lb bags, and cubic feet results.
What it does – the calculator turns the tube’s diameter, depth and quantity into three practical measures: cubic feet, cubic yards, and the number of 80‑lb bags (each bag ≈ 0.6 ft³). Why it matters – ordering too little leaves you scrambling, ordering too much wastes money and space. How to read – cubic feet is the raw volume, divide by 27 for cubic yards, and divide cubic feet by 0.6 for bag count. Example: a 12″ tube (1 ft diameter) 4 ft deep, 1 piece gives 3.14 ft³, 0.12 yd³, and about 6 bags (round up). Use the results to place a precise concrete order.
Pro tips
- Add 5‑10% extra for spillage and uneven subgrade.
- Round bag count up to the next whole bag; you can’t buy a fraction.
- Order bags in multiples of 5 or 10 to reduce delivery fees.
- Double‑check the depth; a common mistake is mixing inches with feet.
Real-life examples
- A homeowner pouring a 12‑inch footings for a new deck needs exact bag count to avoid delays.
- A contractor estimating concrete for multiple sonotubes on a small commercial build.
- A DIY gardener installing a raised‑bed foundation wants to know total volume before ordering.
Case study
Mike needed a 12‑inch sonotube 3 ft deep for his patio. Using the calculator he saw he required 2.36 ft³, 0.09 yd³ and 4 bags. He ordered 4 bags, saved $150 on excess material, and finished on schedule.