Pool Ratio

30 ft round pool: how many gallons?

A 30 ft round pool with 4 ft of water holds about 21,150 US gallons (80,064 litres). Here is what that means for salt and chemicals.

Last updated · Checked against published product doses · How we calculate

Volume
21,150 gal
80,064 litres · 4 ft of water
Salt to 3,200 ppm (new salt pool)565 lb · 15 × 40 lb bags
10% liquid chlorine per +1 ppm27 fl oz
Stabilizer 0 → 40 ppm7.1 lb
Baking soda per +10 ppm alkalinity3 lb
Calcium chloride (77%) per +10 ppm41 oz

Open the chemical calculator for this pool →

The maths

  1. Area = π × 15² = 706.9 sq ft
  2. Volume = 706.9 × 4 = 2,827 cu ft
  3. 2,827 cu ft × 7.48 gal per cu ft

= 21,150 US gallons

Real pools vary: water levels sit a few inches below the wall top, floors slope and corners are rounded. If your pool’s depth differs, adjust it in the volume calculator.

Frequently asked questions

How many gallons is a 30 ft round pool?

About 21,150 US gallons (80,064 litres) with 4 ft of water.

How much salt does a 30 ft round pool need?

About 565 lb (256 kg) to bring fresh water to 3,200 ppm, or 15 bags of 40 lb. Check your salt cell’s target first.

How much chlorine does a 30 ft round pool need?

Each +1 ppm of free chlorine takes about 27 fl oz of 10% liquid chlorine. With stabilizer at 40 ppm, keep free chlorine around 4.6 ppm.

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