Pool salt calculator
Add about 100 lbs of pool salt. Pour it in slowly around the shallow end and brush — the pool is not soup; do not season it by vibes.
Treat this as a starting dose: add less than the full amount when unsure, circulate for a few hours, retest, repeat. Always follow your product's label.
Your salt generator needs the water's salt level within a specific band to produce chlorine — below it, production stops; above it, you risk the cell. The calculator above works out exactly how much salt to add to reach your system's target from where you are now.
How to use it
Enter your pool volume, current salt reading, and the target level your generator specifies, and the tool returns the pounds of pool-grade salt to add. Accurate volume drives the result, so have your real gallon count ready. If you're already at or above target, add none — and if you're well over, the only way down is partial draining and refilling with fresh water.
Use pool-grade salt and your manual's target
Two details matter. Use pool-grade (sodium chloride) salt, not softener pellets or table salt with additives, and use the salt target from your generator's own manual, since ranges differ by brand. Broadcast the salt across the pool with the pump running so it dissolves evenly, and wait several hours (or until fully dissolved and circulated) before retesting — an early reading will be misleadingly low.
Sneak up on the level
Add slightly under the estimate, let it dissolve, and retest before adding the rest, because removing excess salt means diluting with fresh water. Salt depletes through splash-out, backwashing, and rain rather than evaporation, so expect occasional top-ups over the season rather than constant additions. Keep the level in your generator's range and it produces chlorine steadily; let it drop below and the pool loses its sanitizer.
Frequently asked questions
How does a pool salt calculator work?
A pool salt calculator uses your pool gallons, current salt reading, target salt level, and bag size to estimate how many pounds or bags of salt to add.
What salt level should my saltwater pool be?
Use your salt chlorine generator manual. Many Hayward systems target 2,700–3,400 ppm with 3,200 ppm as optimal, while some Pentair IntelliChlor systems list 3,600 ppm as ideal.
Can I add too much salt to a pool?
Yes. If salt gets too high, the usual fix is dilution through partial draining and refilling. There is not a simple chemical that removes excess salt.
Should I trust my control box salt reading?
Use it as a clue, but confirm with a salt test strip, digital salinity meter, or drop test before making a large salt addition.
How long after adding salt should I retest?
Circulate the pool and give the salt time to dissolve and mix. Many owners wait about a day before trusting the next reading, but your equipment manual should guide the exact process.
Embed this calculator (free)
Run a pool site or blog? Drop this tool into any page — it stays free and links back here. Paste this HTML where you want it to appear.
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