Pool Volume Calculator Formula

Understand the math behind the pool volume calculator. Each variable explained with a worked example.

Use the Pool Volume Calculator

Formulas Used

Volume (gallons)

gallons = cubic_ft * 7.481

Volume (liters)

liters = cubic_ft * 28.317

Volume (cubic ft)

volume_cuft = cubic_ft

Variables

VariableDescriptionDefault
length_ftPool Length(ft)30
width_ftPool Width(ft)15
avg_depth_ftAverage Depth(ft)5
cubic_ftDerived value= length_ft * width_ft * avg_depth_ftcalculated

How It Works

How to Calculate Pool Volume

For a rectangular pool, multiply length x width x average depth to get cubic feet, then convert to gallons.

Formula

Volume (cu ft) = Length x Width x Average Depth

Gallons = Cubic Feet x 7.481

For variable-depth pools, average the shallow and deep end depths.

Worked Example

A 30 ft x 15 ft pool with 5 ft average depth.

length_ft = 30width_ft = 15avg_depth_ft = 5
  1. 01Volume = 30 x 15 x 5 = 2,250 cubic feet
  2. 02Gallons = 2,250 x 7.481 = 16,832 gallons
  3. 03Liters = 2,250 x 28.317 = 63,713 liters

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