How to use it
- Enter the tube diameter in inches.
- Enter the depth in feet.
- Enter how many tubes you’ll pour.
- Read the cubic yards, cubic feet, and 80‑lb bag count instantly.
The Concrete Bag for Sonotube Calculator turns the three dimensions you know—diameter, depth, and quantity—into the exact volume of concrete you’ll need. It first converts the tube’s circular cross‑section to cubic feet, multiplies by depth and quantity, then shows the total in cubic feet and the more contractor‑friendly cubic yards (27 ft³ per yd³). Finally it divides the cubic‑foot total by 0.6 ft³ per 80‑lb bag, giving you the bag count you must order. Knowing these three numbers lets you budget accurately, avoid costly over‑orders, and keep your project on schedule. The results appear instantly, so you can adjust dimensions or quantities and see the impact in real time. You can also compare the bag total with supplier minimums, and the cubic‑yard figure aligns with most delivery quotes. The calculator works for any standard 80‑lb mix, making it a reliable tool for DIY homeowners and professional crews alike.
Pro tips
- Add a 10% waste allowance to the bag count for spillage or settling.
- Round up bag totals; you can’t order a fraction of a bag.
- Check supplier minimum order quantities before finalizing your purchase.
- Verify the tube depth includes any extra footings or embedments.
Real-life examples
- A homeowner estimating concrete for a new deck footings using 10‑in Sonotubes.
- A contractor planning multiple wall anchors for a retaining wall project.
- A landscaper ordering concrete for a series of garden planters with varying depths.
Case study
Mike needed 4 ft‑deep 12‑in Sonotubes for a fence footing. The calculator showed 0.85 cubic yards, 2 bags per tube, total 8 bags. He ordered exactly 8 bags, saved $30 and finished on schedule.