Find plan area
Rectangles use length × width, ovals use the ellipse factor π ÷ 4, and round pools use π × radius².
Free South African pool-volume calculator
Pool volume calculator.
Know every litre.
Estimate litres, cubic metres, cover area, turnover flow and fill time for rectangular, oval or round swimming pools.
Start calculating ↓≈Litres · flow · fill time
01Rectangle, oval or round
02Average-depth calculation
03Turnover-flow target
04Optional label-rate scaling
01
Pool capacity
Measure volume before dosing
Accurate volume improves filtration planning and prevents chemical label rates from being scaled against a guess.
02
The method
How the estimate works
Each output shows its assumptions so you can replace defaults with the dimensions, pack sizes and rates available to you.
Average the depth
The shallow and deep depths are averaged, then multiplied by plan area to estimate cubic metres and litres.
Check circulation
Pool volume divided by the selected turnover time gives an ideal flow target before real plumbing and filter losses.
Scale labels only
Reliance Poolclear's information sheet uses length × breadth × average depth and converts cubic metres to litres. Any chemical dose here comes only from the label rate you enter.
Important boundary
Never guess a chemical dose or pump size.
Test the water, follow the exact registered product label and never mix chemicals. A pool professional must account for pipe losses, filter resistance and electrical safety.
See all calculators →Real questions
Questions homeowners ask
How do I calculate how many litres are in my pool?+
Multiply plan area by average depth to get cubic metres, then multiply by 1,000. For a sloping pool, average the shallow and deep depths first.
How do I calculate an oval pool's volume?+
Use length × width × π ÷ 4 for plan area, then multiply by average depth and 1,000 for litres.
What pool-pump flow rate do I need?+
Volume divided by the desired turnover minutes gives an ideal flow target. Final selection must use the pump curve and total plumbing resistance.
Can I use the result to dose pool chemicals?+
Only scale the exact rate on the selected product label after testing the water. The calculator intentionally provides no generic chemical prescription.