Pool Ratio

18 × 33 ft oval pool: how many gallons?

A 18 × 33 ft oval pool with 4 ft of water holds about 13,960 US gallons (52,842 litres). Here is what that means for salt and chemicals.

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

Volume
13,960 gal
52,842 litres · 4 ft of water
Salt to 3,200 ppm (new salt pool)373 lb · 10 × 40 lb bags
10% liquid chlorine per +1 ppm18 fl oz
Stabilizer 0 → 40 ppm4.7 lb
Baking soda per +10 ppm alkalinity2 lb
Calcium chloride (77%) per +10 ppm27 oz

Open the chemical calculator for this pool →

The maths

  1. Area = π × 16.5 × 9 = 466.5 sq ft
  2. Volume = 466.5 × 4 = 1,866 cu ft
  3. 1,866 cu ft × 7.48 gal per cu ft

= 13,960 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 18 × 33 ft oval pool?

About 13,960 US gallons (52,842 litres) with 4 ft of water.

How much salt does a 18 × 33 ft oval pool need?

About 373 lb (169 kg) to bring fresh water to 3,200 ppm, or 10 bags of 40 lb. Check your salt cell’s target first.

How much chlorine does a 18 × 33 ft oval pool need?

Each +1 ppm of free chlorine takes about 18 fl oz of 10% liquid chlorine. With stabilizer at 40 ppm, keep free chlorine around 4.6 ppm.

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