What is an average depth and why use it?

Most pools slope from a shallow end to a deep end. Average depth = (shallow end depth + deep end depth) / 2. This gives a close approximation of total volume without complex calculus.

How accurate is the result?

The formula is accurate for standard pool shapes. For irregular freeform pools, break the pool into rectangular sections, calculate each, and add the volumes together.

How many gallons does a typical backyard pool hold?

A standard 16×32 ft rectangular pool with a 5 ft average depth holds about 19,200 gallons. In-ground pools range from 10,000 to 30,000 gallons.

Can I use feet and inches?

Enter all measurements in the same unit (feet or meters). Convert mixed feet-and-inches values to decimal feet first — for example, 4 ft 6 in = 4.5 ft.

Why does pool shape matter?

Different shapes use different area formulas: rectangles use length × width, circles use π × r², ovals use π × (length/2) × (width/2). Choosing the wrong shape gives an incorrect volume.

Pool Volume Calculator

Enter your pool shape and dimensions to instantly get pool volume in gallons and liters.

Pool Dimensions

Pool Shape

Unit

Length (ft)

Width (ft)

Average Depth (ft)

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

Results

Select a shape and enter dimensions to see the volume.

Summary

Enter your pool shape and dimensions to instantly get pool volume in gallons and liters.

How it works

Select your pool shape (rectangular, circular, oval, or L-shaped).
Enter the length, width (or diameter), and average depth.
For L-shaped pools, enter dimensions for both sections.
Click Calculate to see volume in gallons and liters instantly.
Use the result to plan chemicals, heating, or pump sizing.

Use cases

Determine how many gallons of water a new pool holds.
Calculate the right amount of pool chemicals for shocking or balancing.
Size a pool heater or heat pump accurately.
Estimate fill time when refilling the pool.
Plan a pool cover or liner purchase by knowing surface area.
Help a pool service technician dose treatments correctly.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu