Swimming Pool Volume Calculator
Calculate the volume of water in your swimming pool in gallons and liters. Supports rectangular, circular, oval, and kidney-shaped pools. Perfect for pool maintenance, chemical dosing, and water filling estimates.
What Is a Swimming Pool Volume Calculator?
A swimming pool volume calculator is a tool that estimates the amount of water needed to fill a pool based on its dimensions and shape. Knowing your pool's volume is essential for proper chemical treatment, pump and filter sizing, heating requirements, and water filling estimates.
This calculator supports four common pool shapes:
- Rectangular: The most common shape — length × width × average depth.
- Circular: Round pools — π × (diameter/2)² × average depth.
- Oval: Elliptical pools — π × (length/2) × (width/2) × average depth.
- Kidney: Irregular freeform pools — 0.45 × (long side + short side) × width × average depth.
How Does the Pool Volume Calculator Work?
The calculator uses standard geometric formulas to calculate the volume:
Rectangular: Volume = Length × Width × Average Depth
Circular: Volume = π × (Diameter/2)² × Average Depth
Oval: Volume = π × (Length/2) × (Width/2) × Average Depth
Kidney: Volume ≈ 0.45 × (L₁ + L₂) × Width × Average Depth
The average depth is calculated as (Shallow Depth + Deep Depth) ÷ 2. The volume in cubic feet is then multiplied by 7.48 to convert to US gallons, and by 3.785 to convert gallons to liters.
Why Use This Swimming Pool Volume Calculator?
- Four Shapes: Supports rectangular, circular, oval, and kidney-shaped pools.
- Unit Flexibility: Switch between imperial (feet) and metric (meters).
- Average Depth: Automatically calculates average depth from shallow and deep ends.
- Multiple Outputs: Results in gallons, liters, cubic feet, and cubic meters.
- Free & Private: No registration, no data storage.
❓ Swimming Pool Volume Calculator FAQ
How do I calculate the volume of my swimming pool?
Measure the length, width, and average depth of your pool. For rectangular pools, multiply L × W × avg depth. For circular pools, use π × r² × avg depth. For oval pools, use π × (L/2) × (W/2) × avg depth. This calculator does the math for you.
What is the formula for calculating pool volume in gallons?
Calculate the volume in cubic feet (ft³), then multiply by 7.48 to convert to US gallons. For liters, multiply gallons by 3.785. The calculator does these conversions automatically.
How do I calculate the average depth of my pool?
Average depth = (Shallow Depth + Deep Depth) ÷ 2. For example, if your pool is 3.5 ft at the shallow end and 8 ft at the deep end, the average depth is 5.75 ft. The calculator computes this for you automatically.
How do I calculate the volume of a rectangular pool?
Volume = Length × Width × Average Depth. For example, a 32 ft × 16 ft pool with an average depth of 5.75 ft has a volume of 32 × 16 × 5.75 = 2,944 cubic feet = 22,021 gallons.
How do I calculate the volume of a round pool?
Volume = π × (Diameter/2)² × Average Depth. For example, a 24 ft diameter pool with 5.75 ft average depth has a volume of π × 12² × 5.75 ≈ 2,602 cubic feet = 19,463 gallons.
How do I calculate the volume of an oval pool?
Volume = π × (Length/2) × (Width/2) × Average Depth. For example, a 30 ft × 16 ft oval pool with 5.75 ft average depth has a volume of π × 15 × 8 × 5.75 ≈ 2,168 cubic feet = 16,217 gallons.
How do I calculate the volume of a kidney-shaped pool?
Volume ≈ 0.45 × (L₁ + L₂) × Width × Average Depth. L₁ and L₂ are the long and short side lengths. For example, a kidney pool with L₁=34, L₂=28, W=16, avg depth=5.75 has a volume of 0.45 × 62 × 16 × 5.75 ≈ 2,566 cubic feet = 19,193 gallons.
How many gallons of water does my pool hold?
Enter your pool's dimensions into this calculator to get an accurate estimate in gallons and liters. Typical residential pools hold between 10,000 and 25,000 gallons.
How do I convert cubic feet to gallons?
Multiply cubic feet by 7.48 to get US gallons. For example, 1,000 cubic feet × 7.48 = 7,480 gallons. The calculator does this conversion for you.
How do I convert gallons to liters?
Multiply gallons by 3.785 to get liters. For example, 10,000 gallons × 3.785 = 37,850 liters. The calculator shows both units.
Why is knowing my pool volume important?
Pool volume is essential for proper chemical dosing (chlorine, pH adjusters, algaecides), sizing pumps and filters, calculating heating requirements, and estimating water filling costs.
What is the average depth of a swimming pool?
Residential pools typically have an average depth of 4 to 6 feet. The shallow end is usually 3-4 ft, and the deep end is 6-9 ft. This calculator uses the shallow and deep depths to find the average.
How do I measure my pool for volume calculation?
Measure the length and width at the widest points. For depth, measure at the shallowest and deepest points. Use a tape measure and measure in feet or meters. Enter these values into the calculator.
What is the conversion factor for pool volume?
The standard conversion factor for cubic feet to US gallons is 7.48. For Imperial gallons, use 6.23. The calculator uses 7.48 by default but allows you to customize the factor in advanced options.
Can I use this calculator for an above-ground pool?
Yes. This calculator works for both in-ground and above-ground pools. Enter the pool's dimensions and depth to get an accurate volume estimate.
How do I calculate pool volume for chemical dosing?
Once you have your pool volume in gallons or liters, follow the chemical manufacturer's instructions for dosing. Most pool chemicals specify the amount per 10,000 gallons. This calculator gives you the exact volume for accurate dosing.
What is the difference between US gallons and Imperial gallons?
A US gallon is 231 cubic inches (3.785 liters). An Imperial gallon is 277.4 cubic inches (4.546 liters). This calculator uses US gallons by default but you can adjust the conversion factor in advanced options.
How do I calculate the volume of a pool with a sloping bottom?
Measure the depth at the shallow end and the deep end. The average depth is the midpoint between them. The calculator uses the average depth to provide an accurate volume estimate for sloping-bottom pools.