Pool Gallo Calculator

Pool Gallon Calculator Documentation

What is it?

This calculator helps pool owners determine their pool’s water volume based on shape and dimensions. It supports four common pool shapes (rectangle, circular, oval, kidney) and provides:

• Gallon capacity calculation
• Surface area measurement
• Average depth calculation
• Chemical treatment estimates

Formulas Used

Rectangle Pool:

Volume = Length × Width × Average Depth × 7.48
Surface Area = Length × Width

Circular Pool:

Volume = π × (Diameter/2)² × Depth × 7.48
Surface Area = π × (Diameter/2)²

Oval Pool:

Volume = π × (Length/2) × (Width/2) × Depth × 7.48
Surface Area = π × (Length/2) × (Width/2)

Kidney Pool:

Volume = Length × Width × 0.75 × Depth × 7.48 (approximation)
Surface Area = Length × Width × 0.75

Note: 7.48 is the standard gallons per cubic foot conversion factor

How to Use

1. Select your pool shape from the four options
2. Enter dimensions in feet (length, width, diameter as applicable)
3. Input depth measurements (single depth or shallow/deep end values)
4. View results showing total gallons, surface area, and average depth
5. Check chemical treatment recommendations based on your pool size

FAQs

Q: How accurate is this calculator?
A: It provides professional-grade estimates within ±5% accuracy for standard pools. Irregular shapes may require manual adjustments.

Q: Can I use meters instead of feet?
A: Currently only feet are supported. Convert meters to feet (1m = 3.28ft) before inputting.

Q: Why are my chemical amounts different from pool store recommendations?
A: This provides general guidelines. Always follow your specific product instructions and consult professionals for precise dosing.

Terminology

• Average Depth: (Shallow End Depth + Deep End Depth) ÷ 2
• Gallons per Cubic Foot: Standard conversion factor (7.48 in US)
• Waterline: Distance from pool edge to water surface (typically 6 inches)
• Surface Area: Total area of water surface (square feet)

Formula Sources

All calculations are based on:

• NSF/ANSI 50 standards for pool equipment
• APSP-6 American National Standard for Residential Swimming Pools
• Industry-standard geometric formulas
• Conversion factors from NIST Handbook 44

Important Notes

1. Safety First: Never rely solely on calculations for chemical dosing
2. Real-World Factors: Consider steps, benches, and irregular shapes
3. Seasonal Adjustments: Water expansion/contraction affects volume
4. Professional Consultation: Recommended for commercial pools or complex designs
5. Maintenance Tip: Always round up chemical quantities slightly for safety

Optimization Tip

For best results:

• Measure multiple times for accuracy
• Account for tile lines and coping
• Update calculations after significant renovations
• Consider water displacement from pool accessories