Pool Ratio

28 ft round pool: how many gallons?

A 28 ft round pool with 4 ft of water holds about 18,420 US gallons (69,745 litres). Here is what that means for salt and chemicals.

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

Volume
18,420 gal
69,745 litres · 4 ft of water
Salt to 3,200 ppm (new salt pool)492 lb · 13 × 40 lb bags
10% liquid chlorine per +1 ppm24 fl oz
Stabilizer 0 → 40 ppm6.2 lb
Baking soda per +10 ppm alkalinity2.6 lb
Calcium chloride (77%) per +10 ppm35 oz

Open the chemical calculator for this pool →

The maths

  1. Area = π × 14² = 615.8 sq ft
  2. Volume = 615.8 × 4 = 2,463 cu ft
  3. 2,463 cu ft × 7.48 gal per cu ft

= 18,420 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 28 ft round pool?

About 18,420 US gallons (69,745 litres) with 4 ft of water.

How much salt does a 28 ft round pool need?

About 492 lb (223 kg) to bring fresh water to 3,200 ppm, or 13 bags of 40 lb. Check your salt cell’s target first.

How much chlorine does a 28 ft round pool need?

Each +1 ppm of free chlorine takes about 24 fl oz of 10% liquid chlorine. With stabilizer at 40 ppm, keep free chlorine around 4.6 ppm.

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