Rectangular 30×15 ft, 3–6 ft depth
- Avg depth = 4.5 ft
- Volume ≈ 30 × 15 × 4.5 = 2,025 cu ft
- Gallons ≈ 2,025 × 7.48052 ≈ 15,145
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Pool Volume Calculator
Estimate pool volume in gallons, cubic feet, and cubic meters for rectangular, circular, or oval pools.
Results
- Average depth (ft)
- 4.50
- Volume (cu ft)
- 2025.00
- Volume (gallons)
- 15148.05
- Volume (cu m)
- 57.34
How to use this calculator
- Choose pool shape.
- Enter length/width (or diameter) and shallow/deep depths.
- Review average depth, cubic feet, gallons, and cubic meters.
Inputs explained
- Pool shape
- Select rectangular, circular, or oval to match your pool footprint.
- Length/Width or Diameter
- Horizontal dimensions in feet (diameter only for circular pools).
- Shallow/Deep depth
- Measured at the shallowest and deepest ends; we use the average for volume.
How it works
We find average depth = (shallow + deep) ÷ 2.
Rectangular volume = length × width × avg depth; circular uses πr² × avg depth; oval uses π × (length/2) × (width/2) × avg depth.
Convert cubic feet to gallons (× 7.48052) and cubic meters (÷ 35.3147).
Formula
Average depth = (Shallow + Deep) ÷ 2 Rectangular volume = Length × Width × Avg depth Circular volume = π × (Diameter/2)² × Avg depth Oval volume = π × (Length/2) × (Width/2) × Avg depth Gallons = Cubic feet × 7.48052 Cubic meters = Cubic feet ÷ 35.3147
When to use it
- Sizing chemicals, pumps, and heaters for a new or existing pool.
- Estimating fill costs or water truck deliveries.
- Checking volume before adding treatments or opening/closing the pool.
Tips & cautions
- Measure water depth (not coping) for the most accurate volume.
- If your pool has unusual slopes or ledges, segment the pool into simpler shapes and add volumes.
- Round up slightly for chemical dosing safety margins if unsure of exact dimensions.
- Uses average depth—complex shapes or benches may change true volume.
- Does not account for spas, tanning ledges, or raised features—measure and add separately.
- Assumes uniform slopes between shallow and deep ends.
Worked examples
Circular 18 ft diameter, 3–5 ft depth
- Avg depth = 4 ft
- Volume ≈ π × 9² × 4 ≈ 1,017.9 cu ft
- Gallons ≈ 7,614
Deep dive
This pool volume calculator converts your pool dimensions and depths into gallons, cubic feet, and cubic meters for easy chemical dosing and equipment sizing.
Supports rectangular, circular, and oval pools—enter length/width or diameter plus shallow and deep depths to get a quick, accurate estimate.
FAQs
- How accurate is using average depth?
- For simple slopes it’s a solid estimate. For complex shapes or benches, break the pool into sections and add the volumes.
- Do I include the skimmer/weir area?
- Measure water depth, not coping height. Volume is based on the water you actually hold.
- Can I use meters instead of feet?
- Enter feet for dimensions here; outputs include cubic meters. You can convert your measurements to feet first if needed.
- What about spas or tanning ledges?
- Calculate those volumes separately (often shallow rectangles) and add to the total.
- Does this set chemical dosing?
- No. Use the volume result with your chemical guidelines to dose correctly.
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Estimates only. For precise dosing or equipment sizing, confirm measurements and consult a pool professional.