How to use it
- Enter the tube diameter in inches
- Enter the depth in feet
- Enter how many tubes you will pour
- Read the cubic‑feet, cubic‑yard and bag totals
The Sonotube Concrete Bag Calculator turns the dimensions of your Sonotube form into the exact amount of concrete you’ll need. By entering the tube’s diameter, its depth and how many tubes you plan to pour, the tool instantly shows the volume in cubic feet, converts that to cubic yards for larger projects, and tells you how many 80‑lb bags are required (each bag provides about 0.6 cubic ft). Knowing these numbers before you order prevents over‑buying, saves money, and keeps your schedule on track. The cubic‑feet figure reflects the raw space you’ll fill, the cubic‑yard total is useful for contractor estimates, and the bag count tells you the exact number of mixes to purchase. Use the results to place a precise order and avoid costly leftovers.
Pro tips
- Add a small waste allowance to cover spillage
- Round up the bag count to the next whole bag
- Order a few extra bags if the site is hard to access
- Double‑check diameter and depth entries for typos
Real-life examples
- A DIY homeowner building a concrete patio column
- A contractor estimating material for a fence post foundation
- A landscaper planning multiple tree‑planting tubes
Case study
Mike needed 12 concrete columns for a garden wall. He entered the tube size and quantity, got a bag count of 45, ordered exactly that amount, and finished on schedule without leftover mix.