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Swimming Pool Volume Calculator

Calculate swimming pool volume, water capacity, water weight, fill time, and filling cost for rectangular, circular, oval, kidney, L-shaped and custom pools.

CalculatorHow to CalculateFormulas & ExamplesFAQs

Select a pool shape, enter dimensions, and click Calculate.

Pool Shape

Pool Dimensions

m
m
m

Fill Level (Optional)

Specify the percentage of the pool to be filled. Defaults to 100% if left blank.

%

Water Flow Rate (Optional)

Enter the flow rate of your water supply to estimate how long it will take to fill the pool.

Water Cost (Optional)

Enter your water cost to estimate the total expense for filling the pool.

Dimension Guide
Length (L)WAvg Depth (D)

Results Panel

Awaiting Calculations

Select a pool shape, enter dimensions, and click Calculate to view volume, capacity, weight, and cost estimates.

Formula Details

Pool Surface Area
Rectangular: A = L × W Circular: A = π × (D/2)² Oval: A = π × (L/2) × (W/2) Kidney: A = 0.45 × L × W L-Shaped: A = (L₁ × W₁) + (L₂ × W₂)

Calculates the top-down area of the pool based on the selected shape. The kidney shape uses a standard industry factor of 0.45 to approximate the area of the organic curve.

Variables Explained
  • L
    Length:The longest dimension of the pool.
  • W
    Width:The widest dimension of the pool.
  • D
    Diameter:Diameter of a circular pool.
  • 0.45
    Kidney Factor:Industry standard shape factor for kidney pools.
Pool Volume Formula
Volume = Surface Area × Average Depth

The pool volume is calculated by multiplying the surface area by the average water depth. Average depth is used because most pools have varying depths from shallow to deep end.

Variables Explained
  • Avg Depth
    Average Depth:The average of the shallow end and deep end depths.
Water Capacity & Weight
Capacity (L) = Volume (m³) × 1,000 Weight (kg) = Water Required (L) × 1.0 Weight (lbs) = Water Required (L) × 2.205

Converts the geometric volume to liters and calculates the weight of the water at the selected fill level. Fresh water weighs exactly 1.0 kg per liter (metric) or approximately 8.34 lbs per US gallon (imperial).

Estimated Fill Time
Fill Time = Water Required (L) ÷ Flow Rate (L/hour)

Estimates how long it will take to fill the pool based on the water supply flow rate. A typical garden hose delivers about 500–2,000 liters per hour depending on pressure and nozzle size.

Estimated Water Cost
Cost = Water Required (L) × Cost per Liter

Calculates the total water cost for filling the pool. The cost per liter is derived from the entered cost per unit (per liter, per cubic meter, or per gallon).

Calculation Example

Residential Rectangular Pool (Metric)
Scenario

A homeowner is building a standard rectangular swimming pool measuring 10 meters long, 5 meters wide, with an average depth of 1.5 meters. Estimate the pool volume, water capacity, weight, and filling time using a garden hose at 1,000 L/hour.

Calculation Steps
  1. 1.Calculate surface area.
    Surface Area = 10 m × 5 m = 50.00 m²
  2. 2.Calculate pool volume.
    Volume = 50.00 m² × 1.5 m = 75.00 m³
  3. 3.Convert to water capacity.
    Capacity = 75.00 m³ × 1,000 = 75,000 Liters
  4. 4.Calculate water weight.
    Weight = 75,000 L × 1.0 kg/L = 75,000 kg
  5. 5.Estimate filling time.
    Fill Time = 75,000 L ÷ 1,000 L/hr = 75 hours 75 hours = 3 days 3 hours
Final Quantity NeededVolume: 75 m³, Capacity: 75,000 L, Weight: 75,000 kg, Fill Time: 75 hours
Circular Above-Ground Pool (Imperial)
Scenario

An above-ground circular pool has a diameter of 15 feet and an average depth of 4 feet. Calculate the volume in US Gallons and estimated water weight.

Calculation Steps
  1. 1.Calculate radius.
    Radius = 15 ft / 2 = 7.5 ft
  2. 2.Calculate surface area.
    Surface Area = π × 7.5² = 176.71 ft²
  3. 3.Calculate pool volume.
    Volume = 176.71 ft² × 4 ft = 706.86 ft³
  4. 4.Convert to US Gallons.
    Capacity = 706.86 ft³ × 7.48052 = 5,287.8 US Gallons
  5. 5.Calculate water weight.
    Weight = 5,287.8 gal × 8.34 lbs/gal = 44,100.3 lbs
Final Quantity NeededVolume: 706.86 ft³, Capacity: 5,288 gal, Weight: 44,100 lbs
Kidney-Shaped Backyard Pool (Metric)
Scenario

A backyard kidney-shaped pool measures 9 meters long and 5 meters at its widest point, with an average depth of 1.4 meters. The owner wants to fill it to 90% capacity. Water costs ₹0.06 per liter.

Calculation Steps
  1. 1.Calculate surface area using kidney factor.
    Surface Area = 0.45 × 9 m × 5 m = 20.25 m²
  2. 2.Calculate pool volume.
    Volume = 20.25 m² × 1.4 m = 28.35 m³
  3. 3.Convert to liters.
    Capacity = 28.35 m³ × 1,000 = 28,350 Liters
  4. 4.Calculate water required at 90% fill.
    Water Required = 28,350 L × 0.90 = 25,515 Liters
  5. 5.Estimate water cost.
    Cost = 25,515 L × ₹0.06/L = ₹1,530.90
Final Quantity NeededVolume: 28.35 m³, Capacity: 28,350 L, Required: 25,515 L, Cost: ₹1,530.90

How to Use

Follow these steps to calculate your swimming pool volume, water capacity, fill time, and cost:

  1. Choose your unit system: Select either **Metric** or **Imperial** at the top of the calculator.
  2. Select the pool shape: Pick from Rectangular, Circular, Oval, Kidney, L-Shaped, or Custom Volume.
  3. Enter the required dimensions: Input the length, width, diameter, or other measurements for the selected shape.
  4. Enter the average water depth: Calculate this by averaging the shallow end and deep end depths.
  5. Set fill percentage (optional): Default is 100%. Lower this if you want to estimate a partial fill.
  6. Set water flow rate (optional): Choose a preset or enter a custom flow rate to estimate fill time.
  7. Enter water cost (optional): Input your local water rate and currency to estimate filling cost.
  8. Click Calculate: View all results — volume, capacity, weight, fill time, and cost — together in the results panel.

Frequently Asked Questions

How do I calculate swimming pool volume?
Pool volume is calculated by multiplying the surface area of the pool by the average water depth. The surface area formula depends on the pool shape — rectangular pools use Length × Width, circular pools use π × Radius², and kidney pools use the industry-standard factor of 0.45 × Length × Width. The resulting volume in cubic meters is then converted to liters (1 m³ = 1,000 L).
Why should I use average depth instead of maximum depth?
Most pools have a shallow end and a deep end. Using average depth gives a more accurate volume estimate than using the maximum depth, which would overestimate. To calculate average depth, add the shallow end depth and the deep end depth, then divide by 2. For example, a pool with a 1.2 m shallow end and 2.4 m deep end has an average depth of 1.8 m.
How long will it take to fill my pool?
Fill time depends on your water supply flow rate. A standard garden hose delivers approximately 500–1,000 liters per hour. A larger supply line can deliver 1,500–2,500 liters per hour. Divide the total water volume needed by the flow rate to get the estimated fill time. For example, a 50,000 L pool filled at 1,000 L/hour would take approximately 50 hours.
How much does it cost to fill a swimming pool?
The cost depends on your local water rates and pool size. To estimate, multiply the total liters of water needed by your cost per liter. Water rates vary by region — in India, municipal water typically costs ₹0.03–0.10 per liter; in the US, it averages $0.002–0.006 per gallon. This calculator lets you enter your exact rate for a precise estimate.
Which unit system should I use?
Use Metric (meters, liters) if you are in most countries outside the US. Use Imperial (feet, gallons) if you are in the United States. The calculator automatically converts all internal calculations and displays results in your chosen units.
How accurate are these pool volume estimates?
The calculations are mathematically precise for the given dimensions. However, real pools may have rounded corners, sloped floors, steps, ledges, or irregular contours that slightly reduce the actual volume. For standard residential pools, the estimates are typically within 5–10% of the actual capacity. For precise measurements, consult your pool builder's specifications.

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Disclaimer

Calculations are estimates based on the values you enter and standard engineering formulas. Results are intended for planning and estimation only. Always verify critical measurements, specifications, and local building requirements before purchasing materials or beginning construction.