Swimming Pool Volume Calculator
Determine the exact water capacity of your residential or commercial swimming pool in US gallons, litres, and cubic metres. Select rectangular, circular, or oval geometries and specify variable shallow-to-deep depths to calculate water volume, filtration pump turnover duration, chlorine shock dosage, and swimming lap counts.
Geometry used to apply specific volumetric integration formulas
Longest internal waterline dimension (or diameter for circular pools)
Internal waterline width across narrowest axis (ignored for circular pools)
Water depth at the shallow steps or beach entry
Water depth at the deepest drain point
Filtration pump turnover flow rate in gallons per minute
Total capacity in US liquid gallons (standard for chemical treatment packaging)
How to Use This Calculator
- Select your pool geometric shape: rectangular, circular, or oval.
- Enter the internal length and width in metres measured at the waterline.
- Specify the water depth at the shallowest point and deepest main drain.
- Optionally verify your filtration pump rating in gallons per minute (GPM).
- Review immediate water volume, required pump run time, and workout lap requirements.
Formula & Calculation Methodology
Water capacity is computed by multiplying the horizontal surface area by the arithmetic average depth between shallow and deep ends, then converting cubic metres to liquid US gallons and litres.
Worked Example
A 10m × 5m rectangular in-ground pool with shallow depth 1.0m and deep end 2.0m
Frequently Asked Questions
Why is calculating exact pool volume critical for pool maintenance?↓
Accurate water volume is required to correctly dose sanitizing chemicals (chlorine, bromine), balance pH and alkalinity, add algaecide, and size the filtration pump and heater. Under-dosing invites bacterial and algae growth, while over-dosing damages pool liners and causes skin irritation.
What is water turnover time and why does it matter?↓
Turnover time is the duration required for the pool circulation pump to filter 100% of the water volume. The Association of Pool & Spa Professionals (APSP) recommends residential pools complete at least one full turnover every 6 to 8 hours.
How do I calculate volume for a kidney-shaped or irregularly contoured pool?↓
For freeform or kidney pools, calculate the average width across the two main lobes, measure the total length, and apply the oval formula (Length × Average Width × Average Depth × 0.85).
How many laps in a 10-metre pool equal a competitive 1,500m swim workout?↓
In a 10-metre pool, swimming 1,500 metres requires 150 single lengths (or 75 round-trip laps). In a standard 25-metre short-course pool, 1,500 metres is 60 lengths.
What are the physical volume limits of this calculator?↓
This calculator assumes uniform vertical or trapezoidal bottom slope gradients. Pools featuring multi-tier tanning ledges, beach entries, or integrated hot tubs require calculating individual section volumes separately and summing them.
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Open calculator →Source Citation & Disclaimer
Informational tool only; not licensed tax, legal, or financial advice.