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Pool Volume Calculator

Rectangular pool volume in gallons. Free online Pool Volume Calculator for construction — instant, accurate results, mobile-friendly, no signup needed.

Gallons
16,830

Derivation

  1. ├── 01Givenl = 30, w = 15, d = 5
  2. ├── 02Formulae.l × e.w × e.d × 7.48
  3. ├── 03Substitutee.30 × e.15 × e.5 × 7.48
  4. └── 04Compute Gallons16,830
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§01What is

Understanding the Pool Volume Calculator

The Pool Volume Calculator computes Gallons from 3 inputs: length (ft), width (ft), avg depth (ft). Rectangular pool volume in gallons.

On a construction site, estimates that come in 10% off add up to six-figure overruns. Running the quantities with a calculator instead of a rule-of-thumb gets you closer to the truth with zero extra effort. The Pool Volume Calculator sits in that toolkit — it rectangular pool volume in gallons. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

e.l × e.w × e.d × 7.48

Where

l
Length (ft)
w
Width (ft)
d
Avg depth (ft)
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Length (ft) = 30, Width (ft) = 15, Avg depth (ft) = 5.

  1. 01Start by noting the input — Length (ft): 30.
  2. 02Start by noting the input — Width (ft): 15.
  3. 03Start by noting the input — Avg depth (ft): 5.
  4. 04Substitute these values into the formula: e.l × e.w × e.d × 7.48
  5. 05Compute Gallons: the calculator returns 16830.
  6. 06Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common Pool Volume Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Length (ft) halved

l = 15 (from 30)

Keep every other input at its default and halve the length (ft). See how gallons responds.

  1. 01New Length (ft): 15
  2. 02Baseline Gallons: 16830
  3. 03New Gallons: 8415
  4. 04Gallons decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Length (ft) doubled

l = 60 (from 30)

Keep every other input at its default and double the length (ft). See how gallons responds.

  1. 01New Length (ft): 60
  2. 02Baseline Gallons: 16830
  3. 03New Gallons: 33660
  4. 04Gallons increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Width (ft) halved

w = 7.5 (from 15)

Keep every other input at its default and halve the width (ft). See how gallons responds.

  1. 01New Width (ft): 7.5
  2. 02Baseline Gallons: 16830
  3. 03New Gallons: 8415
  4. 04Gallons decreases by 50% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Width (ft) doubled

w = 30 (from 15)

Keep every other input at its default and double the width (ft). See how gallons responds.

  1. 01New Width (ft): 30
  2. 02Baseline Gallons: 16830
  3. 03New Gallons: 33660
  4. 04Gallons increases by 100% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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