Add a tube to a square base below it.
⚙️Calculation Parameters
📊Calculated Output
How Tube and Square Footing Calculator Works?
To combine a tube with a square footing, the Tube and Square Footing Calculator adds a rectangular pad volume to a cylinder volume. The process takes 4 steps.
Enter the square pad
Type the length, width and thickness of the base.
Enter the tube
Type the tube diameter and its height above the pad.
Sum both parts
The calculator adds the prism and the cylinder in cubic feet (ft³).
Read the totals
The tool shows cubic yards (yd³), cubic meters (m³), bags and the pad share of the total.
Tube and Square Footing Calculator Formula
The Tube and Square Footing Calculator adds a prism and a cylinder.
Pad
V_p = L × W × t ÷ 1,728Inches to ft³.
Tube
V_t = π × (D ÷ 24)² × (H ÷ 12)H measured above the pad.
Total
V = V_p + V_tNonoverlapping sum.
Worked example: 24 × 24 × 12 in pad with 12 in × 36 in tube
- V_p = 6,912 ÷ 1,728 = 4.00 ft³
- V_t = 2.356 ft³
- V = 6.356 ft³ (0.235 yd³)
Tube and Square Footing Calculator Conversion Table
The tube and square footing conversion table lists 5 combined piers on square pads.
| Tube | Square pad | Tube ft³ | Pad ft³ | Total ft³ | Total yd³ |
|---|---|---|---|---|---|
| 10 × 40 in | 20 × 20 × 8 in | 1.82 | 1.85 | 3.67 | 0.136 |
| 12 × 40 in | 24 × 24 × 8 in | 2.62 | 2.67 | 5.28 | 0.196 |
| 12 × 36 in | 24 × 24 × 12 in | 2.36 | 4.00 | 6.36 | 0.235 |
| 16 × 48 in | 30 × 30 × 10 in | 5.59 | 5.21 | 10.79 | 0.400 |
| 18 × 48 in | 36 × 36 × 12 in | 7.07 | 9.00 | 16.07 | 0.595 |
Square pads need about 27% more concrete than round pads of the same width.
What is Tube and Square Footing Calculator?
A Tube and Square Footing Calculator is a combined calculator for a Sonotube pier set on a square or rectangular footing pad.
Square pads are the most common footing in deck and porch plans. A 12 in × 36 in tube on a 24 in × 24 in × 12 in pad holds 6.36 ft³, and the pad accounts for 63% of the concrete. The calculator shows that split, which surprises many builders who size only the tube.
The pad volume often matters more than the tube volume, so leaving it out leads to running short.
What are the uses of Tube and Square Footing Calculator?
There are 4 main uses of the Tube and Square Footing Calculator.
Code deck footings
Builders size code-specified pads with tubes.
Formed pads
Crews size boxed pads poured before the tube.
Porch columns
Contractors total square bases under round columns.
Order checks
Estimators confirm pad concrete is included.
🔗Related Sonotube Calculators
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Get the volume of a round footing.
Square Footing Volume Calculator
Get the volume of a square footing.
Tube and Round Footing Calculator
Add a tube to a round footing below it.
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