Pool Gallon Calculator
Calculate how many gallons are in your pool or pond
Pool Volume Formulas
Rectangular Pool: Length × Width × Average Depth × 7.5 = Gallons
Circular Pool: Diameter × Diameter × Average Depth × 5.9 = Gallons
Oval Pool: Long Diameter × Short Diameter × Average Depth × 6.7 = Gallons
Why Pool Volume Calculation Matters:
"Pool gallon calculator" and related terms like "pond calculator gallons" and "water volume calculator" are popular searches because:
- Proper chemical treatment depends on accurate gallon measurements
- Pump and filter sizing requires knowing your pool's volume
- Water replacement calculations need precise gallon counts
- Heating costs are directly related to water volume
Common Pool Sizes (Approximate Gallons):
Small Pool (12' x 24')
~8,600 gallons (4' average depth)
Large Pool (20' x 40')
~30,000 gallons (5' average depth)
Understanding Pool Volume Calculations
Accurately calculating your pool's water volume in gallons is essential for proper maintenance. Whether you're using a gallon calculator for your swimming pool, spa, or garden pond, knowing the exact volume helps with chemical dosing, equipment sizing, and water replacement.
Different Calculation Methods
Our water volume calculator supports three common shapes: rectangular, circular, and oval. Each shape requires slightly different formulas to convert dimensions to gallons. For irregular shapes, you may need to combine calculations or consult a professional.
Why Volume Matters
When searching for "how many gallons is my pool calculator," pool owners typically need this information for:
- Proper chemical treatment (chlorine, pH adjusters, algaecides)
- Selecting the right size pump and filter system
- Calculating water replacement needs
- Estimating heating costs (gas, electric, or solar)
Beyond Pools: Other Uses
This tool also works as a pond calculator gallons tool for garden ponds, koi ponds, and water features. The same principles apply whether you're calculating volume for a small backyard pond or a large swimming pool.