Saltwater Pool Salt Calculator

It first multiplies your gallons by 3.785412 to get liters, then finds the ppm you still need as the target minus the current reading. Since 1 ppm is 1 milligram per liter, the grams of salt equal that ppm rise times the liters divided by 1000, which it also shows in pounds and kilograms.

Most salt chlorine generators call for roughly 2,700 to 3,400 ppm, and 3,200 ppm is a common default. Always defer to the range printed on your specific generator, since running too low starves the cell and too high can trigger fault codes or corrosion.

The tool clamps the ppm to add at zero and tells you no salt is needed. You cannot lower salinity by adding salt, so the only way down is to drain a portion and refill with fresh water to dilute it.

Use pure, non-iodized sodium chloride sold as pool salt, without anti-caking agents, yellow prussiate of soda, or additives. The dose here assumes essentially 100 percent salt, so an impure product will fall a little short of the target.

For large doses many owners add it in stages, broadcasting it over the pool floor or into the water while the pump runs. Adding a portion, circulating, and retesting lowers the chance of overshooting a target that is hard to reverse.

Run the pump to circulate the water and let the salt dissolve fully, which usually takes about 24 hours. Testing too soon reads the water before the salt has spread evenly, so the number will be misleadingly low.

The core calculation depends only on volume and the ppm gap, so temperature does not change the salt weight. What matters most is an accurate pool volume, since an over-estimated gallon figure leads to over-salting.

The volume field expects US gallons and the internal conversion uses 3.785412 liters per gallon. If you know your volume in liters, divide by 3.785412 first, or convert imperial gallons since those are about 1.2 US gallons each.

No. Every figure is computed locally in your browser with simple arithmetic, so your pool size and readings stay on your device and nothing is saved or sent to a server.