How to use it
- Enter the tube diameter (12 in).
- Input the depth in feet you plan to pour.
- Specify how many Sonotubes you need.
- Read cubic feet, cubic yards and bag count instantly.
This calculator tells you exactly how much concrete you’ll need to fill one or more 12‑inch Sonotubes. You enter the tube’s internal diameter (12 in), the depth you plan to pour (in feet), and how many tubes you’re using. The tool converts the volume to cubic feet, then to cubic yards for ordering bulk, and finally to the number of 80‑lb bags based on the constant that each bag yields about 0.6 ft³. Knowing these three numbers helps you avoid costly over‑orders or shortfalls that delay a project. Read the results: cubic feet shows the raw volume, cubic yards is the standard bulk‑order unit, and the bag count tells you how many individual bags to purchase. All calculations happen instantly, so you can plan and budget with confidence.
Pro tips
- Add 5‑10% extra for spillage and settling.
- Round bag count up to the next whole bag to ensure enough mix.
- Order bulk cubic yards if you need more than 10 bags for better pricing.
- Double‑check depth measurements; a 1‑ft error changes volume significantly.
Real-life examples
- A DIY homeowner pouring a concrete footing for a shed using multiple 12‑in. Sonotubes.
- A contractor estimating material for a small retaining wall with 12‑in. columns.
- A landscaper installing a decorative concrete post base for a garden feature.
Case study
Mike needed three 12‑in. Sonotubes 4 ft deep for a patio. The calculator showed 13.5 ft³ total, which is 0.5 yd³ and 23 bags. He ordered 24 bags, avoided a shortfall, and finished on schedule.