Compare the concrete for each tube width.
⚙️Calculation Parameters
📊Calculated Output
How Sonotube Diameter Comparison Tool Works?
To compare diameters, the Sonotube Diameter Comparison Tool holds depth and count fixed and recalculates volume for each selected diameter. The process takes 4 steps.
Set a fixed depth
Type one depth, such as 48 in (122 cm), and one pier count.
Select diameters
Tick 2 or more sizes from 6 in to 48 in.
Compare volumes
The tool lists volume, bags and bearing area for each diameter side by side.
Read the ratio
Each row shows a multiple of a base size, so the cost of going up one size is clear.
Sonotube Diameter Comparison Tool Formula
The Sonotube Diameter Comparison Tool uses the square law of circle area.
Volume ratio
V₂ ÷ V₁ = (D₂ ÷ D₁)²At equal depth.
Bearing area
A = π × (D ÷ 2)²In square inches (in²).
Extra concrete
ΔV = V₁ × ((D₂ ÷ D₁)² − 1)Added by moving up a size.
Worked example: 10 in vs 12 in at 48 in deep
- (12 ÷ 10)² = 1.44, so the 12 in tube holds 44% more
- V₁₀ = 2.18 ft³ and V₁₂ = 3.14 ft³
- ΔV = 0.96 ft³ per pier, about 1.6 bags of 80 lb mix
Sonotube Diameter Comparison Tool Conversion Table
The diameter comparison conversion table compares 8 tube sizes at a fixed 48 in (122 cm) depth against a 10 in base.
| Diameter | Area (in²) | ft³ | 80 lb bags | vs 10 in |
|---|---|---|---|---|
| 6 in (15 cm) | 28.3 | 0.79 | 2 | 0.36× |
| 8 in (20 cm) | 50.3 | 1.40 | 3 | 0.64× |
| 10 in (25 cm) | 78.5 | 2.18 | 4 | 1.00× |
| 12 in (30 cm) | 113.1 | 3.14 | 6 | 1.44× |
| 14 in (36 cm) | 153.9 | 4.28 | 8 | 1.96× |
| 16 in (41 cm) | 201.1 | 5.59 | 10 | 2.56× |
| 18 in (46 cm) | 254.5 | 7.07 | 12 | 3.24× |
| 24 in (61 cm) | 452.4 | 12.57 | 21 | 5.76× |
Bearing area and volume grow with the square of diameter.
What is Sonotube Diameter Comparison Tool?
A Sonotube Diameter Comparison Tool is a side-by-side tool that compares concrete volume, bags and bearing area across tube diameters at the same depth.
Picking a tube size is a trade between strength and concrete. Going from 10 in to 12 in raises bearing area and volume by 44%. Going from 12 in to 16 in raises both by 78%. The tool puts those numbers next to each other, so the step up is a measured choice.
Bearing area matters on weak soils, where the pier base must spread the load. The tool lists area in square inches for that check.
What are the uses of Sonotube Diameter Comparison Tool?
There are 4 main uses of the Sonotube Diameter Comparison Tool.
Size selection
Builders pick the smallest tube that meets the load.
Cost trade-offs
Estimators price each diameter for the same job.
Soil bearing
Designers compare base areas against allowable soil pressure.
Client options
Contractors show owners the cost of upsizing.
🔗Related Sonotube Calculators
View all 106 subtools →Sonotube Measurement Range Calculator
See the volume for a range of sizes.
Sonotube Height Comparison Tool
Compare the concrete for each tube height.
Sonotube Volume Calculator
Find how much concrete fills a round tube.
Sonotube Cubic Yards Calculator
See your concrete in cubic yards.