Expert Verified Updated: March 2026

Round Pool Volume Calculator

Quickly calculate the gallons for any circular pool. Perfect for above-ground setups and round in-ground spas.

Quick Conclusion
A typical 24' round pool with 4' of water holds approximately 13,500 gallons. To calculate, square the diameter, multiply by the depth, and then multiply by 5.9.

Technical Comparison

Diameter Water Depth (4') Est. Volume (Gal)
18' 48" 7,600
24' 48" 13,500
30' 48" 21,000

Actionable Steps

Pro-Tip

The Liner Factor: Be careful not to over-calculate volume based on "pool size" alone. Many round pools have 1-2 inches of sand "covng" at the bottom edges which reduces total displacement more than you'd think.

Frequently Asked Questions

Is it accurate?

Yes, using standard geometric/chemical formulas.

Related Tools

Maintenance

Backwash Duration Calculator

Optimize your filter cleaning cycle. Estimate exactly how long it takes to...
Maintenance

Backwash Time Calculator

Proper backwashing prevents cloudiness and protects your pump. Estimate...
Maintenance

Evaporation Loss Calculator

Determine if your water loss is normal physics or a structural leak....
Maintenance

Filter Pressure Rise Calculator

Know exactly when to backwash or clean your filter elements based on your...

Get the Complete DIY Pool Maintenance Guide

Free PDF checklist including seasonal schedules, chemical balancing secrets, and maintenance tips.