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POOL EQUIPMENT TOOLSEquipment sizing made clearer
Pool circulation
& filtration calculator
Turn customer pool dimensions into preliminary sizing references for circulation and filtration equipment.
Metric & imperialFour pool shapesNo sign-up
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Project inputs
Define your pool
Suggested starting point
6 h turnover 25 m/h filtration rate
Applied automatically for hotel & club pool. Adjust when local requirements or product data call for a different value.Unit system
Filter assumptionsSand / glass media
This calculator uses a media-filter loading rate. Cartridge and D.E. filters require model-specific flow and surface-area data, so confirm those options against the manufacturer's product information.
For irregular pools, enter the customer's estimated water surface and average depth. All results are preliminary equipment-sizing references.
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Calculated output
Equipment sizing snapshot
Required circulation flow
62.5m³/hPool volume375.0m³
Water surface250.0m²
Average depth1.50m
Filter area2.08m²
Planning flow allowance66–72m³/h
Turnover period6.0h
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Equipment selection referenceBilanda supplies pool equipment. These results support preliminary product guidance and are not engineering or construction design.
Live geometry
See the pool take shape.
The drawings update with the customer's shape, dimensions and selected unit system.
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Plan view
Indicative geometry for equipment-sizing reference only—not an engineering or construction drawing.
Transparent by design
From dimensions to a practical starting point.
The calculator keeps its inputs clear, helping customers describe their pool before asking Bilanda for suitable equipment guidance.
Pool volume
Length × width × mean end depth
Design flow
Pool volume ÷ turnover period
Filter area
Design flow ÷ filtration rate
Planning band
Design flow with 5–15% flow margin
Direct sizing answers
How do I size circulation and filtration for my pool?
These plain-language rules explain the same calculations used above, so customers and search assistants can verify every result.
How do I calculate swimming-pool volume?
For a rectangular pool, multiply length × width × average water depth. For a sloped pool, use the shallow section, transition and deep section separately. Circular volume uses π × radius² × depth; oval volume uses π × half-length × half-width × depth.
What circulation flow does my pool need?
Required circulation flow in m³/h equals pool volume in m³ ÷ turnover period in hours. A 250 m³ pool with a 4-hour turnover therefore requires 62.5 m³/h before any planning allowance.
How much filter area is required?
Required filter area in m² equals circulation flow in m³/h ÷ filtration rate in m/h. Lower filtration rates require more filter area and normally provide more conservative filtration.
How many Bilanda sand filters are suitable?
First calculate the flow here, then open the Bilanda selector. It adds the chosen reserve, checks operating rate, catalogue flow and connection capacity, and compares identical filters installed in parallel.
Calculate filter quantity →Built by equipment specialists
Practical tools, backed by Bilanda manufacturing experience.
Bilanda develops and manufactures water pumps, filtration equipment and pool-system components for projects worldwide.
Explore Bilanda products24+Years of experience
99+Patents & certificates
50+Export countries
30,000+m² factory area
Practical pool guides
Clear answers before equipment selection.
Short English references explain the inputs behind the calculators and link each answer to the relevant Bilanda tool.
POOL VOLUME
How to calculate swimming pool volume
Rectangular, circular, oval and irregular pools, including sloped bottoms.
Read guide →FILTER QUANTITYHow many sand filters does a pool need?
Turn required flow into a conservative single or parallel filter arrangement.
Read guide →DESIGN INPUTSPool turnover and filtration rate guide
Understand what the two rates mean and why application matters.
Read guide →