Saltwater Pool Salt Calculator

Q: How much salt do I add to my saltwater pool?

Pounds of salt = (target ppm − current ppm) × gallons × 8.34 ÷ 1,000,000. For a 15,000-gallon pool going from 0 to 3,200 ppm, that's about 400 pounds, or roughly ten 40-lb bags. This calculator does the math once you enter your volume and salinity readings.

Q: What salt level should a saltwater pool be?

Most salt chlorine generators run best between 2,700 and 3,400 ppm, with 3,200 ppm a common target — but always follow your specific SWG manufacturer's recommendation. Too low and the cell won't produce chlorine; too high and you risk corrosion and a high-salt fault. This tool defaults to 3,200 ppm and lets you change it.

Q: How do I lower the salt level in my pool?

There's no chemical that removes salt. The only way to lower salinity is to drain part of the pool and refill with fresh water, which dilutes the salt concentration. If your reading is already at or above target, this calculator will tell you no salt is needed and recommend dilution if you're over.

Q: How long after adding salt can I test?

Add salt with the pump running and brush it around to help it dissolve. Wait roughly 24 hours with the pump circulating before taking a salinity reading, since undissolved salt won't register accurately. Add in stages toward your target rather than overshooting — it's far easier to add more than to dilute.

Q: Does adding salt affect other pool chemistry?

Salt itself is fairly neutral, but salt chlorine generators tend to raise pH over time as they produce chlorine, so watch pH and total alkalinity after switching on the cell. Check overall water balance with the LSI calculator and correct pH with the dosing calculator as needed.

Find exactly how much salt to add to hit your salt chlorine generator's target. Enter your volume and salinity readings — get pounds and 40-lb bags.

Your Pool & Salinity

Pool volume

Not sure? Use the volume calculator →

Current salinity ppm

Target salinity ppm

Most SWGs target 2,700–3,400 ppm. Follow your cell's manual.

Salt to Add

400

lb · ≈ 10 bags (40 lb)

Track salt & chemistry per pool

For guidance only. Add salt in stages with the pump running, then wait ~24 hours before re-testing. It's easier to add more than to dilute — don't overshoot your target.

How the Salt Calculation Works

Salt is measured in parts per million (ppm). To raise salinity by a known amount, you add salt in proportion to your pool's water weight:

Pounds of salt = (Target − Current) × Gallons × 8.34 ÷ 1,000,000

The 8.34 is the weight of one gallon of water in pounds. For a 15,000-gallon pool starting at 0 ppm and targeting 3,200 ppm: (3,200 − 0) × 15,000 × 8.34 ÷ 1,000,000 ≈ 400 pounds, or about ten 40-lb bags.

A few field notes

Add in stages. Pour salt across the pool with the pump running and brush it toward the drain to dissolve.
Wait before testing. Give it ~24 hours of circulation before reading salinity — undissolved salt won't register.
You can't remove salt. If you're over target, the only fix is to drain partially and refill with fresh water.

Get your volume from the pool volume calculator, check overall balance with the LSI calculator, and remember that salt cells nudge pH up over time — keep the dosing calculator handy.

Salt Calculator FAQ

How much salt do I add to my saltwater pool?

What salt level should a saltwater pool be?

How do I lower the salt level in my pool?

How long after adding salt can I test?

Does adding salt affect other pool chemistry?

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