Home & Construction
Pool Volume, Fill Time & Water Cost Calculator
Updated Aug 25, 2026 Reviewed Aug 25, 2026
Estimate capacity, partial fill or drain volume, ideal time and optional water cost for supported pool shapes or combined sections.
Pool capacity and water planning
Enter pool sections, water depths and fill scenario
Result
Calculation summary
Enter values to see the result
Your result, breakdown, assumptions, and warnings will appear here.
Pool profile preview
Plan shape, average depth and level change
Full capacity
15,148.05 US gal
Fill or drain volume
15,148.05 US gal
Ideal transfer time
25.25 h
How to use this calculator
- 1Add one or more non-overlapping pool sections.
- 2Enter shallow and deep water depths.
- 3Set current and target fill levels.
- 4Enter measured flow and optional water price.
Formula
Volume = plan area × average water depth
Average depth is the arithmetic mean of shallow and deep depth.
Calculation steps
- Calculate each plan area.
- Calculate average water depth.
- Sum full capacity.
- Apply current and target percentages.
- Calculate ideal time and optional fill cost.
Worked example
A 10 m × 5 m rectangular pool averaging 1.5 m deep holds about 75 m³.
Assumptions
- Depth changes sufficiently uniformly.
- Sections do not overlap.
- Kidney area is an approximation.
- Flow remains constant.
- Equipment sizing is excluded.
Sources
Frequently asked questions
How is average depth calculated?
It is the mean of shallow and deep water depths.
Can I model an irregular pool?
Yes, divide it into non-overlapping supported sections.
Can it calculate a top-up?
Yes, set current and target percentages.
Can it calculate draining?
Yes, set target below current.
Does time include pressure changes?
No, flow is assumed constant.
Does it size equipment?
No, pump and filter sizing are outside scope.
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