Pool Volume Calculator
Gallons in a pool, plus chlorine dosing.
Enter your values
Choose one of: Rectangular, Round, Oval.
Enter the length or diameter in ft.
Enter the width in ft.
Enter the shallow end depth in ft.
Enter the deep end depth in ft.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Volume
- 21,065 US gallons
- In litres
- 79,740 L
- Average depth
- 5.5 ft
- Surface area
- 512 sq ft
- Liquid chlorine for 1 ppm
- 22.5 fl oz
Quick answer
Rectangular pool gallons equal length × width × average depth in feet × 7.48.
Gallons = L × W × avg depth × 7.48
At a glance
| What it does | Gallons in a pool, plus chlorine dosing. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Shape, Length or diameter, Width, Shallow end depth, Deep end depth |
| Main output | Volume |
| Formula | Gallons = L × W × avg depth × 7.48 |
| Cost | Free — no sign-up, no download |
How to use the Pool Volume Calculator
- 1Pick the pool shape.
- 2Enter the dimensions in feet.
- 3Enter shallow and deep end depths.
Inputs explained
- Shape
- Choose one of: Rectangular, Round, Oval.
- Length or diameter(ft)
- Enter the length or diameter in ft.
- Width(ft)
- Enter the width in ft.
- Shallow end depth(ft)
- Enter the shallow end depth in ft.
- Deep end depth(ft)
- Enter the deep end depth in ft.
Worked example
Using the values the calculator loads with:
Inputs
- ShapeRectangular
- Length or diameter32 ft
- Width16 ft
- Shallow end depth3 ft
- Deep end depth8 ft
Results
- Volume21,065 US gallons
- In litres79,740 L
- Average depth5.5 ft
- Surface area512 sq ft
- Liquid chlorine for 1 ppm22.5 fl oz
Frequently asked questions
Why does volume matter?
Every chemical dose — chlorine, acid, stabiliser — is prescribed per 10,000 gallons, so an accurate volume prevents over-dosing.
How much chlorine for a shock?
Shocking usually targets 10 ppm free chlorine, so roughly ten times the 1 ppm dose shown above.
What do I need to enter into the Pool Volume Calculator?
Just 5 values: shape, length or diameter, width, shallow end depth, deep end depth. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Pool Volume Calculator work out the answer?
Rectangular pool gallons equal length × width × average depth in feet × 7.48. It applies the formula Gallons = L × W × avg depth × 7.48 and shows the working so you can check each step by hand.
Is the Pool Volume Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.