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Pool Salt Calculator

Find out how much salt to add to your saltwater pool to reach your target salinity. Enter your pool volume and current salt level to get the pounds, kilograms and number of 40 lb bags you need.

Last updated

gallons
ppm

Read this from your salt system or a test strip. Use 0 for a fresh fill.

ppm

Most salt chlorinators run best around 3,000-3,400 ppm.

Results

Salt to add
266.9 lb

Raises salinity by 3,200 ppm.

40 lb bags(Rounded up to whole bags.)
7
In kilograms
121.1 kg

Breakdown

  • Salt to add266.9 lb (100%)

How the pool salt calculator works

Salinity is measured in parts per million (ppm), which is the weight of salt relative to the weight of water. Since a US gallon of water weighs about 8.34 pounds, the calculator works out the total weight of your pool water, multiplies by the gap between your current and target salinity, and converts that fraction into the pounds of salt needed.

Adding salt safely

Add salt gradually with the pump running and brush it across the pool floor so it dissolves rather than settling. Retest after about a day before adding more. It is easier to top up with another small amount than to dilute an over-salted pool, so aim slightly under target on the first pass.

Worked example

Suppose you have a 10,000 gallon pool currently at 0 ppm and you want to reach a target of 3,200 ppm.

  1. 1.Salinity increase needed (3,200 - 0)3,200 ppm
  2. 2.Water weight (10,000 gal x 8.34 lb)83,400 lb
  3. 3.Salt to add (83,400 x 3,200 / 1,000,000)266.9 lb
  4. 4.Bags (266.9 / 40, rounded up)7 bags
  5. 5.In kilograms (266.9 / 2.20462)121.1 kg

Result: Add about 266.9 lb of salt, which is 7 of the 40 lb bags, or roughly 121.1 kg, to reach 3,200 ppm.

Frequently asked questions

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