Concrete Sonotube Calculator
Uses the same round column math as the column calculator with deck/post wording.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Use inside tube diameter and pour height from top of footing to cut height.
What the math is doing
Volume = π × (d/2)² × height × number of tubes.
Frequently asked questions
Belleville washers?
Hardware not included.
Above-grade cuts?
Height is net concrete only.
Bigfoot bases?
Add base block volume separately.
Inspection?
Follow local pier depth tables.