POOL VOLUME CALCULATOR
Fill your pool perfectly every time!
Rectangle
Circle
Kidney
Pool Volume Calculator – How to Measure Pool Water Accurately
Knowing exactly how much water your swimming pool holds is key to balanced chemistry, lower running costs, and efficient heating or filtration. Whether you have a rectangular, round, or free-form pool, this guide explains step-by-step how to calculate water capacity — and how to use a digital pool volume calculator for fast results.
At 907 Heating and Plumbing, we specialize in professional pool plumbing, heating, and maintenance. Our experts ensure your system stays efficient year-round — starting with knowing your exact pool volume.
Why Pool Volume Matters
Understanding your pool’s capacity helps you make smarter maintenance decisions:
- Chemical Accuracy – Correct water volume prevents over- or under-chlorination.
- Energy Efficiency – Sizing pumps and heaters to your pool saves energy and extends lifespan.
- Balanced Filtration – Optimizes circulation and reduces debris buildup.
- Cost Planning – Lets you estimate refills and maintenance costs more precisely.
Step-by-Step: How to Calculate Pool Volume
1. Rectangular Pool Volume
Example: 20 ft × 10 ft × 5 ft × 7.5 = 7,500 gallons
2. Circular Pool Volume
Example: A 12 ft radius × 4 ft depth ≈ 13,564 gallons
3. Oval or Kidney-Shaped Pool Volume
Use the average of the longest and shortest widths:
Pro Tip: For irregular pools, use a digital pool volume calculator to eliminate guesswork.
Common Mistakes When Calculating Pool Volume
- Forgetting slope variation: Measure both shallow and deep ends, then average.
- Mixing units: Keep all dimensions in feet before converting to gallons.
- Estimating irregular pools by eye: Divide the pool into smaller geometric sections for better accuracy.
Top Tools for Pool Volume Measurement
Manual formulas are reliable, but technology makes it faster:
- Online Pool Volume Calculators – Enter your pool dimensions for instant gallon/liter results.
- Mobile Apps – Many pool maintenance apps include built-in calculators.
- Professional Services – 907 Heating and Plumbing can measure and balance your pool volume precisely.
FAQs – Pool Volume & Water Capacity
1. How can I calculate pool volume in liters?
Multiply gallons by 3.785 to get liters.
2. How do I find average depth?
Add shallow + deep end depths, then divide by 2.
3. When should I recalculate my pool volume?
Re-measure after major shape changes, depth adjustments, or persistent chemical imbalance.
4. Can I estimate volume without measuring?
You can approximate using shape and size, but digital calculators or professional measurements give far more accuracy.
Need Professional Pool Plumbing or Heating?
907 Heating and Plumbing provides:
Keep your pool safe, clean, and energy-efficient — contact us today!