Swimming Pool Volume Calculator

📋 How to use this calculator

1. Choose pool shape: rectangle, oval, round, or sloped (varying depth).
2. Enter dimensions in feet: length, width/diameter, and average depth.
3. For sloped pools, enter shallow and deep end depths separately for automatic averaging.
4. Enter your local water rate ($/1000 gallons) based on residential tier; default $4.00 per 1000 gallons (US average).
5. Click Calculate for volume (cubic feet, gallons, liters), estimated fill cost, and chlorine dosage.
6. Choose shock treatment mode (10 ppm) or daily maintenance (2-4 ppm) for correct chlorine dosing.

🧮 Geometric Volume and Chlorine Dosing (CDC/MAHC)

• V = pool volume (cubic feet); 1 cubic foot = 7.48 US gallons = 28.32 liters
• L, W = length and width; D = average depth (ft)
• a, b = major and minor axes of oval; r = radius
• Target ppm = 2-4 (routine), 10 (shock); cal-hypo 60-70% active, liquid sodium hypochlorite 12%

For sloped pools, average D = (D_shallow + D_deep) / 2. Add 5-10% buffer for freeboard and evaporation.

💡 Worked example: Rectangular pool 26 x 13 x 5 ft, water rate $4.00/1000 gal

Result: Volume 1690 cu ft (12,641 gal / 47,860 L), fill cost approx $50.56, maintenance dose approx 9 oz cal-hypo 60% per application.

❓ Frequently asked questions

📚 Sources & references

• Model Aquatic Health Code (MAHC) 3rd Edition — Centers for Disease Control and Prevention (CDC)
• WHO Guidelines for Safe Recreational Water Environments Vol. 2 — World Health Organization
• EPA Drinking Water Standards and Health Advisories — U.S. Environmental Protection Agency