Calculators
Salt Water Pool Calculator
A fresh fill or a pool that was drained starts near zero ppm — you are building salinity from scratch, not topping off a few hundred ppm. This layout uses 20,000 gallons and 0 ppm current with a 3,200 ppm target so you can see a full initial dose.
Use the controls below if your volume or target differs. The math is the same rule pool pros quote: about one pound per thousand gallons raises salinity roughly 120 ppm.
Run the pump while you add salt and keep metals and stabilizer decisions separate from this salt-only estimate.
Result
| Pool volume | 20,000 gal |
|---|---|
| Raise salinity by | 3,200 ppm |
| Salt to add | 533.3 lb |
| 40 lb bags (rounded up) | 14 |
| Leftover after bags | 26.7 lb |
About 1 lb of salt per 1,000 gallons raises salinity roughly 120 ppm. Estimates only — confirm with your test kit.
Pool salt and testing supplies
- 40 lb bags of pool salt for saltwater chlorinator systems (opens in new tab)
- Salt test strips or a digital salt meter for ppm readings (opens in new tab)
- A wide-mouth bucket or scoop for pouring salt away from the skimmer (opens in new tab)
- Pool brush to spread piles on the floor while the pump runs (opens in new tab)
Find these on Amazon (opens in new tab)
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