Why Knowing Your Pool's Volume is Crucial
Knowing the exact volume of your pool is the most important step in proper water maintenance. Every chemical dosage, from chlorine to algaecide, is based on the total amount of water in the pool.
Under-dosing can lead to unsafe water and algae growth, while over-dosing can damage pool equipment, irritate swimmers, and waste hundreds of dollars on chemicals. This calculator helps you get that foundational number right.
Chemical Dosing Basics
Dosages are approximate and can vary. Always read and follow your specific product's label directions.
| Chemical | Typical Dosage (per 10,000 Gallons) |
|---|---|
| Chlorine (Shock) | 1 lb (1-2 bags) to raise chlorine by 5-10 ppm. |
| pH Increaser (Soda Ash) | Approx. 6 oz to raise pH by 0.2. |
| Alkalinity Increaser | Approx. 1.5 lbs to raise alkalinity by 10 ppm. |
| Calcium Hardness Increaser | Approx. 1.25 lbs to raise hardness by 10 ppm. |
How to Use the Calculator
- Select the shape that most closely matches your pool.
- Enter the dimensions (length, width, or diameter) in feet.
- Calculate the average depth. For a sloped pool, measure the depth of the shallow end and the deep end, add them together, and divide by two. (e.g., (3ft + 8ft) / 2 = 5.5ft average depth).
- Enter your local water cost if you know it (often found on your utility bill).
- Click "Calculate Volume" for your results.
Frequently Asked Questions
What if my pool has a complex, freeform shape?
For a freeform pool, it's best to mentally divide it into several smaller, regular shapes (rectangles, ovals). Calculate the volume of each section and add them together for an approximate total. It's better to slightly overestimate than underestimate.
How many gallons are in a cubic foot?
There are approximately 7.48 US gallons of water in one cubic foot. This is the conversion factor used in the calculator.