Kidney Pool Calculator
Surface Area, Internal Shell Area & Volume
Calculation Results
Kidney-shaped pools are very popular in homes and resorts because they look natural and fit nicely into curved landscapes. However, their shape makes them harder to measure than simple rectangular or circular pools. When you want to fill the pool, add chemicals, install a pump, or order a pool cover, you must know the exact size and water volume.
This is where the Kidney Pool Calculator becomes useful. It helps you estimate the surface area and water volume of a kidney-shaped pool using a few simple measurements. Instead of guessing, you get accurate results that save time, money, and effort.
In this guide, every step is explained clearly so anyone can understand how the calculator works and how to use it correctly.
What the Kidney Pool Calculator Is
A Kidney Pool Calculator is an online tool that estimates:
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The surface area of a kidney-shaped pool
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The total water volume
Because kidney pools have curved sides, normal rectangle or circle formulas do not work. The calculator uses a special shape factor that matches the natural curve of the pool.
This tool is useful for:
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Pool owners
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Maintenance workers
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Contractors
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Resort managers
It helps with filling the pool, chemical dosing, equipment sizing, and overall pool planning.
How the Kidney Pool Calculator Works
Inputs You Enter
To get accurate results, the calculator usually asks for:
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Pool length (L) – the longest distance from end to end
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Wide width (W₁) – the widest part of the pool
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Narrow width (W₂) – the narrowest part
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Shallow depth – depth at the shallow end
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Deep depth – depth at the deep end
These measurements describe the full shape of the pool.
Calculation Process
The calculator:
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Estimates the surface area using a kidney-shape formula
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Calculates the average depth
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Multiplies area by depth to get volume
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Converts volume into gallons or litres
Output You Get
You receive:
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Pool surface area
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Total water volume
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Gallons or litres needed to fill the pool
Key Formulas Used
Kidney Pool Surface Area Formula
A \approx 0.45 \times (W_1 + W_2) \times LWhere:
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A = Surface area
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L = Pool length
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W₁ = Wide width
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W₂ = Narrow width
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0.45 = Kidney shape factor
This factor adjusts for the curved edges.
Average Depth Formula
D_{avg} = \frac{Depth_{shallow} + Depth_{deep}}{2}This gives a simple depth estimate for the whole pool.
Pool Volume Formula
Volume = A \times D_{avg}This gives volume in cubic units.
Convert to Gallons
Gallons = Volume_{cuft} \times 7.48Convert to Litres
Litres = Volume_{m^3} \times 1000Step-by-Step Examples
Example 1: Medium Backyard Pool
Measurements:
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Length = 12 m
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Wide width = 6 m
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Narrow width = 4 m
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Shallow depth = 1.2 m
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Deep depth = 2.0 m
Step 1: Surface area
A = 0.45 \times (6 + 4) \times 12
A = 54 \text{ m}^2
Step 2: Average depth
D_{avg} = \frac{1.2 + 2.0}{2} = 1.6 \text{ m}Step 3: Volume
Volume = 54 \times 1.6 = 86.4 \text{ m}^3Step 4: Convert to litres
Litres = 86.4 \times 1000 = 86,400So, the pool holds 86,400 litres of water.
Example 2: Small Pool in Gallons
If volume = 1,200 cubic feet:
Gallons = 1200 \times 7.48 = 8,976The pool holds 8,976 gallons.
Features of the Kidney Pool Calculator
Accurate Shape Handling
It uses a special formula for curved pools.
Easy Measurements
Only basic dimensions are needed.
Automatic Conversions
Gives results in gallons and litres.
Fast Results
No manual math required.
Beginner Friendly
Simple and easy to use.
Uses and Applications
Pool Filling
Know exactly how much water is needed.
Chemical Dosing
Correct chlorine and treatment amounts.
Pump and Filter Sizing
Ensure proper water circulation.
Pool Covers and Liners
Estimate surface area correctly.
Maintenance Planning
Better scheduling and cost control.
Helpful Tips for Best Results
Measure Carefully
Use a tape or measuring wheel.
Use Average Depth
Do not guess the depth.
Stay Consistent With Units
Do not mix meters and feet.
Measure Widths Correctly
Use both wide and narrow points.
Round Slightly Up
Always allow a small safety margin.
Common Mistakes to Avoid
Using Rectangle Formulas
Kidney pools are not rectangles.
Guessing Depth
This causes big volume errors.
Ignoring Narrow Width
Both widths are important.
Mixing Units
Keep all measurements in one system.
Forgetting Shape Factor
It adjusts for curves.
Frequently Asked Questions
What Is a Kidney Pool?
A curved, natural-shaped swimming pool.
Why Is Volume Important?
It controls water and chemical use.
Can I Use This for Any Pool?
Only for kidney-shaped pools.
Is the Result Exact?
It is a very close estimate.
Do I Need Special Tools?
Just a measuring tape.
Final Words
The Kidney Pool Calculator is a simple and reliable tool for estimating pool area and water volume. It removes the confusion of curved shapes and gives you accurate results for better pool planning.
Whether you are filling a new pool, adjusting chemicals, or planning maintenance, this calculator helps you make smart and confident decisions. Measure carefully, enter the correct values, and let the calculator do the work for you.