# Pool Volume Calculator

Calculate your swimming pool's water volume in gallons and liters. Supports rectangular, round, and oval pools.

## What this calculates

How many gallons does your pool hold? Enter your pool's shape, dimensions, and average depth to calculate the total water volume in gallons, liters, and cubic feet. The calculator also estimates how long it would take to fill using a standard garden hose.

## Inputs

- **Pool Shape** — options: Rectangular, Round / Circular, Oval
- **Length (or Diameter)** (feet) — min 1, max 200 — For round pools, enter the diameter
- **Width** (feet) — min 1, max 100 — Not used for round pools
- **Average Depth** (feet) — min 0.5, max 20 — (Shallow end + deep end) / 2

## Outputs

- **Volume (gallons)**
- **Volume (liters)**
- **Volume (cubic feet)**
- **Fill Time (garden hose)** — formatted as text — At ~9 gallons per minute

## Details

Pool volume formulas:

  - Rectangular: Length x Width x Avg Depth x 7.48 gal/ft³

  - Round: π x Radius² x Avg Depth x 7.48

  - Oval: π x (Length/2) x (Width/2) x Avg Depth x 7.48

Average depth = (shallow end depth + deep end depth) / 2

Knowing your pool volume is essential for:

  - Correct chemical dosing (chlorine, pH adjusters, algaecide)

  - Sizing pumps and filters

  - Estimating water costs

  - Calculating heating requirements

## Frequently Asked Questions

**Q: How do I find the average depth of my pool?**

A: Measure the depth at the shallow end and the deep end, then average them: (shallow + deep) / 2. For pools with a consistent depth, just use that measurement. For pools with complex bottoms, measure at several points and average.

**Q: How long does it take to fill a pool?**

A: A standard garden hose delivers about 9 gallons per minute. A typical 15,000-gallon pool takes about 28 hours to fill. Using a fire hydrant or multiple hoses can reduce this significantly. Check with your water utility for bulk fill rates.

**Q: How much does it cost to fill a pool?**

A: With average US water rates of about $0.005 per gallon, filling a 15,000-gallon pool costs roughly $75. Rates vary widely by location. Some areas offer bulk water delivery by truck at $150-$500 per load (typically 6,000 gallons).

**Q: How much chlorine does my pool need?**

A: A general rule is 1 pound of granular chlorine per 10,000 gallons to raise the level by 1 ppm. Most pools should maintain 1-3 ppm of free chlorine. Always test your water before adding chemicals and follow product instructions.

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Source: https://vastcalc.com/calculators/construction/pool-volume
Category: Construction
Last updated: 2026-04-21