How to use it
- Enter the tube diameter in inches.
- Enter the depth in feet.
- Set the number of tubes you will pour.
- Read the cubic feet, cubic yards, and required 80‑lb bag count.
The Quikrete Sonotube Concrete Calculator tells you exactly how much mix you’ll need for any diameter and depth. You input the tube’s inside diameter (in), the planned depth (ft), and how many tubes you’re pouring. The tool instantly returns the volume in cubic feet, converts that to cubic yards (27 ft³ = 1 yd³), and divides the cubic‑foot total by 0.6 ft³ per 80‑lb bag to show the bag count. Knowing these numbers helps you order the right amount, avoid costly over‑orders, and keep the job on schedule. Read the results: cubic feet shows raw volume, cubic yards is the standard delivery unit, and bag count lets you purchase the exact number of 80‑lb bags. You can also adjust the quantity to see how material needs change for larger projects or multiple columns.
Pro tips
- Add 5–10% extra for spillage and compaction.
- Round bag count up to the next whole bag; you can’t buy fractions.
- Order bags in full pallets to qualify for bulk discounts.
- Double‑check diameter measurement; use the inside diameter, not the outer.
Real-life examples
- A homeowner building a 3‑ft‑deep fence post footing.
- A contractor pouring concrete columns for a deck foundation.
- A landscaper installing a garden statue base using a Sonotube.
Case study
Mike needed concrete for four 4‑in‑diameter, 2‑ft‑deep Sonotubes. Using the calculator, he saw he required 0.94 yd³, which translated to 5 bags. He ordered exactly five 80‑lb bags, avoided a $30 over‑order, and finished the project on time.