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Pool Salt Calculator
Find the pounds of salt to raise a saltwater pool to your target ppm.
Salt to add
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Pounds of pool salt.
| 40-lb bags | — |
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| Increase | — |
| Pool volume | — |
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Enter your figures above to see the step-by-step working.
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How the Pool Salt Calculator Works
A saltwater pool needs its salt kept in a range — usually around 3,000–3,400 ppm. To raise the level, multiply your pool’s volume in gallons by the ppm increase you want, times 8.34 (the pounds in a gallon of water), divided by one million. A 15,000-gallon pool going from 1,500 to 3,200 ppm needs about 213 pounds of salt — roughly six 40-pound bags.
Add salt gradually with the pump running, and retest after it fully dissolves (a day or so) before adding more. If your level is already at or above target, you don’t add salt — you dilute with fresh water instead.
pounds of salt = gallons × ppm increase × 8.34 ÷ 1,000,000
Frequently Asked Questions
How much salt does my pool need?
Multiply your gallons by the ppm increase you want, times 8.34, divided by one million. That gives the pounds of salt to add.
What salt level should a saltwater pool be?
Most salt chlorine generators want about 3,000–3,400 ppm. Check your generator’s manual for its exact target.
What if my salt is already too high?
You can’t remove salt chemically — drain part of the pool and refill with fresh water to dilute it back into range.
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