01
The purpose
What does this calculator estimate?
Concrete needed for your pool shell — floor and walls — in cubic yards, with weight and cost.
Construction & Design · F2
Concrete Pool Shell Volume Calculator
Concrete needed for your pool shell — floor and walls — in cubic yards, with weight and cost.
Measure the inputsOrder about 10% extra — shell thickness varies and over-spray happens.
Read the full resultThicker shells cost more but resist cracking in expansive or unstable soil.
Check the boundaryConcrete weighs roughly 2 tons per cubic yard — confirm truck access to the site.
Useful forConstruction & DesignPlanningComparisonVerification
Live calculation
Shell inputs
✓ Checked May 2026
Enter pool size, depths, and shell thickness.
Calculated result
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Enter the required values to calculate.
Enter the known values. Let the engine handle the calculation.
✓ Formula checked↻ Live result○ No account needed
Planning estimate only. Confirm product labels, equipment specifications, qualified-professional advice and local requirements before acting.
The result, explained
Use the Concrete Pool Shell Volume Calculator result with context.
Concrete needed for your pool shell — floor and walls — in cubic yards, with weight and cost.
02
The tool
What information does it use?
- Pool length: enter a measured or verified value
- Pool width: enter a measured or verified value
- Shallow end depth: enter a measured or verified value
- Deep end depth: enter a measured or verified value
- Shell thickness: Gunite walls/floor, typically 6–8 inches.
- Concrete type: Gunite or shotcrete.
03
The method
How to use this calculator
- Pool lengthEnter the value you can verify.
- Pool widthEnter the value you can verify.
- Shallow end depthEnter the value you can verify.
- Deep end depthEnter the value you can verify.
- Shell thicknessGunite walls/floor, typically 6–8 inches.
- Concrete typeGunite or shotcrete.
04
The relationship
The formula in plain English
Concrete = (floor area + wall area) × shell thickness
Surface area = L×W + perimeter × avg depth. Cubic yards = cubic ft × 0.037. Add 10% waste.05
Worked through
A worked example: 32 × 16 ft pool, 3.5/8 ft depths, 6-inch shell
- Avg depth = 5.75 ft; floor = 512, walls = 96 × 5.75 = 552 → 1,064 ft²
- Shell ft = 0.5; concrete = 1,064 × 0.5 = 532 cu ft
- CY = 532 × 0.037 = 19.7; +10% ≈ 21.7 CY
| Pool size | Avg depth | Surface area | Concrete CY |
|---|---|---|---|
| 28 × 14 ft | 5.5 ft | 854 ft² | 15.8 CY |
| 32 × 16 ft | 5.75 ft | 1,064 ft² | 19.7 CY |
| 36 × 18 ft | 6.0 ft | 1,296 ft² | 24.0 CY |
| 40 × 20 ft | 6.25 ft | 1,550 ft² | 28.7 CY |
| 20 × 40 ft | 6.5 ft | 1,580 ft² | 29.3 CY |
06
Why it matters
How the result supports the next decision
Order about 10% extra — shell thickness varies and over-spray happens.
Thicker shells cost more but resist cracking in expansive or unstable soil.
07
Good inputs
Improve the estimate before relying on it
- Order about 10% extra — shell thickness varies and over-spray happens.
- Thicker shells cost more but resist cracking in expansive or unstable soil.
- Concrete weighs roughly 2 tons per cubic yard — confirm truck access to the site.
- Gunite (dry mix) and shotcrete (wet mix) differ in handling but compute the same volume.
- Schedule the shoot in one continuous pour for a monolithic, leak-resistant shell.
08
The boundary
How to interpret the result
Confirm structural assumptions, site conditions and local requirements with qualified professionals.
The engine reports invalid inputs and safety warnings beside the result. Resolve those messages before using the estimate.
09
Before acting
What should override this estimate?
- Measured site conditions and current test results
- Product labels and manufacturer specifications
- Qualified-professional advice and applicable local codes
10
Common questions
Frequently asked questions
How much concrete does a pool shell need?
Take the total surface area — the floor plus the walls — and multiply by the shell thickness in feet to get cubic feet, then convert to cubic yards. A typical 32-by-16-foot pool with a 6-inch shell needs roughly 14 to 16 cubic yards before adding a waste allowance.
How thick should a pool shell be?
Six inches is common for residential gunite shells, increasing to eight or more in expansive soils, for deep ends, or where engineering calls for it. Thicker shells cost more concrete and steel but resist cracking and movement better. Always follow the structural engineer's specification for your site.
What's the difference between gunite and shotcrete?
Both are sprayed concrete for pool shells. Gunite is a dry mix combined with water at the nozzle; shotcrete is pre-mixed wet and pumped. They yield similar finished shells and the volume math is identical — the choice is largely about crew preference, equipment, and how the mix is delivered.
How much does a pool shell weigh?
Concrete weighs roughly two tons per cubic yard, so a 15-cubic-yard shell weighs around 30 tons. That's separate from the water load. Knowing the shell weight matters for soil bearing and for confirming the site and access can handle the equipment and material.
Why add a waste allowance to concrete?
Real shells aren't perfectly uniform — thickness varies as crews shoot curves and benches, and some material rebounds or is trimmed. Adding about 10 percent ensures you don't run short mid-pour, which is critical because the shell should be shot continuously for a strong, watertight result.
How many yards of concrete for a pool?
Roughly 14–16 cubic yards for a 32×16 pool with a 6-inch shell, before a 10% waste allowance.
How thick is a gunite pool shell?
Typically 6 inches residential, 8+ inches in expansive soil or per the engineer's spec.
Is gunite or shotcrete better?
Both make strong shells; the difference is dry-mix vs wet-mix application, not final quality.
Primary sources
Use the result with current guidance.
These official references support safe planning context. Product labels, local requirements and qualified-professional advice take priority over a general calculator estimate.