How to use it
- Enter the tube’s diameter in inches.
- Enter the depth in feet.
- Enter the quantity of tubes you’re filling.
- Read the cubic yards, 80‑lb bags, and cubic feet results.
The calculator takes the tube’s 8‑inch diameter, the depth you plan to pour, and the number of tubes, then instantly returns three useful measures: total cubic yards of concrete, how many standard 80‑lb bags you’ll need, and the total cubic feet. Knowing cubic yards helps you order from a ready‑mix supplier, while bag count is handy for DIY projects where you’ll mix on‑site. The cubic‑foot figure lets you verify the volume against your project plans or compare different mix options. No complex math is required – just input your dimensions and let the tool do the work.
Pro tips
- Add a 10% waste allowance to the bag count to avoid shortfalls.
- Round up the cubic‑yard figure to the nearest full yard when ordering ready‑mix.
- Order a few extra bags if you’ll be mixing on‑site to cover spillage.
- Double‑check that the diameter is entered as 8 in; using a different size changes the volume.
Real-life examples
- A homeowner pouring a concrete footing for a shed needs to know how many 80‑lb bags to buy.
- A contractor estimating material for a row of 8‑inch Sonotube piers on a new deck.
- A DIY landscaper calculating concrete for multiple garden planters.
Case study
Mike needed concrete for four 8‑inch Sonotube footings. Using the calculator, he saw he required 0.9 cubic yards, which translated to 15 bags. He ordered 16 bags, had enough material, and finished on schedule.