Free · Water tank and vessels calculators 🏊

Rectangular & Oval Pool Fill Calculator

Estimate pool water volume and fill cost from average depth.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A rectangular pool 10 meters long and 4 meters wide, with end depths of 1 and 2 meters, has a modeled volume of 60,000 liters. At 2 per cubic meter, filling it costs 120.

Average depth = (depth 1 + depth 2) ÷ 2; volume = plan area × average depth

Worked example

Enter these known values and leave the other values blank.

Length
10 m
Width
4 m
Depth 1
1 m
Depth 2
2 m
Water price
2 USD / m³
Pool shape
Rectangle
Pool volume
60000 L
Water cost (for this rectangular pool)
120 USD

Assumptions and limitations

  • It assumes the entered depths represent a linear depth change across a rectangular or elliptical footprint. Steps, benches, curved walls, irregular bottoms and the actual waterline can change capacity.
  • Use consistent units and project-specific dimensions, density and prices. This geometric estimate does not add quantities that are absent from the formula.

Common questions

When is the average-depth method appropriate?

It assumes the entered depths represent a linear depth change across a rectangular or elliptical footprint. Steps, benches, curved walls, irregular bottoms and the actual waterline can change capacity.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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