Expert Verified Updated: March 2026

Rectangular Pool Volume Calculator

The foundation of pool chemistry. Calculate exactly how many gallons your pool holds so every chemical dose is precise.

Quick Conclusion
A standard 16' x 32' rectangular pool with an average depth of 5' holds approximately 19,200 gallons. Knowing this number is critical: dosing a 15k pool with 20k chemical amounts is the #1 cause of cloudiness.

Technical Comparison

Pool Size Avg Depth Est. Volume (Gal)
12' x 24' 4.5' 9,700
16' x 32' 5.0' 19,200
20' x 40' 5.5' 33,000

Actionable Steps

Pro-Tip

The "Water Weight" Alert: Water is heavy. Every 1,000 gallons weighs roughly 8,340 lbs. When you calculate a 20,000-gallon pool, you are managing over 166,000 lbs of liquid. This is why structural integrity and proper foundation in construction are non-negotiable.

Frequently Asked Questions

Is it accurate?

Yes, using standard geometric/chemical formulas.

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