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Get a reliable spa volume estimate in seconds. No complicated math required.
We’ll show the correct measurement guide and dimensions for your selected spa.
We don’t store your data. Calculations are done in your browser.
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Enter your spa dimensions to see your estimated volume
Model: CPS-CF100
Ideal for spas up to 10,000 gallons.
Delivers efficient filtration for clean, swim-ready water.
Your spa is approximately XX,XXX gallons, which may be beyond the recommended range for our standard Clarus filter systems.
Our team can help determine the right filtration setup based on your spa volume, flow rate, plumbing, and application.
Use our Pump Run Time Calculator
Use our Chemical Dosage Calculator
Get expert tips, seasonal reminders, free calculators, and 10% off your first order.
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Measure the inside waterline dimensions of your spa rather than the outside edge of the cabinet or shell.
For length and width, measure across the water surface. For depth, measure from the waterline to the spa floor and enter an estimated average water depth.
If your spa has a mostly uniform depth, measure from the waterline to the spa floor.
If the depth varies because of seating, steps, or a footwell, take a few representative depth measurements and average them before entering the result.
You do not need to measure each feature separately. Enter the main inside-waterline dimensions of your spa and use an estimated average water depth.
Keep in mind that molded seats, loungers, steps, footwells, and curved walls displace water, so the calculated volume may be higher than the spa’s actual water capacity.
Select the shape that most closely matches the overall water surface of your spa.
If your spa has an irregular or non-standard shape, choose Irregular / Custom for the closest estimate.
Knowing your spa volume helps you calculate the right amount of chemicals, understand filtration and circulation needs, and maintain clean, balanced water.
The calculator provides an estimate based on the spa shape, dimensions, and average water depth you enter.
Actual water capacity can vary because of molded seats, loungers, steps, footwells, curved walls, and equipment areas. For the most accurate capacity, refer to your spa manufacturer’s specifications when available.
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