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Pool Salt Dose Calculator

Work out pool salt dose instantly with clear inputs, formula shown and shareable results.

About Pool Salt Dose Calculator

Salt dose is the ppm increase times pool volume, converted to kilograms. Salt is not consumed by the chlorinator — it only leaves through splash-out, backwashing and rain overflow — so top-ups are far smaller than the initial fill.

Formula

Salt dose

salt (kg) = ppm increase x volume (m3) / 1000

Worked example

With the default values below, Pool Salt Dose Calculator returns Salt required of 63.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Pool volume
45 m³
Current salt level
1,800 ppm
Target salt level
3,200 ppm
Bag size
25 kg

Results

Salt required
63.00 kg
Bags needed
3 bags
Increase required
1,400 ppm
Increase per bag
555.56 ppm

Step by step

  1. 1Values used
  2. 2Salt dose
  3. 3Salt required= 63.00 kg
  4. 4Bags needed= 3 bags
  5. 5Increase required= 1,400 ppm
  6. 6Increase per bag= 555.56 ppm

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does salt not get used up?

The chlorinator converts salt to chlorine, which then reverts to salt after doing its work. Only water loss removes it.

What happens if salt is too high?

Above about 4,000-5,000 ppm the water tastes salty and corrosion of ladders, heaters and stone coping accelerates. The only fix is partial draining.

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