How to use this pool volume calculator
Enter the values requested above and select Calculate. Change any input to compare another scenario. The calculation runs locally in your browser and does not require an account.
Formula and method
Example
A 30×15-foot pool averaging 5 feet deep holds about 16,831 gallons.
Tips for a useful result
For sloped pools, use a reasonable average depth or divide the pool into sections for a better estimate.
What this calculator is useful for
Estimate rectangular pool water volume in gallons from length, width and average depth. The result is intended for quick estimates, checking arithmetic and comparing scenarios. When a result affects a contract, tax filing, medical decision, building-code requirement or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
Frequently asked questions
What does the Pool Volume Calculator calculate?
Estimate rectangular pool water volume in gallons from length, width and average depth.
How does the Pool Volume Calculator work?
Volume in cubic feet = length × width × average depth. US gallons ≈ cubic feet × 7.48052.
Is the Pool Volume Calculator free to use?
Yes. ERICH Calculators is free to use and does not require an account.