Estimate salt addition, pool volume, and drain-and-refill dilution from one fast tool. Built for pool owners who want a practical result without clutter.
Calculator
Auto-calculates as you type.
Use average depth for pools with a shallow and deep end. For unusual shapes, split the pool into simpler sections and add the estimates.
Calculator
Estimate gallons before adding salt.
Calculator
Estimate drain and refill volume.
Result examples
These curated examples make the calculator result easier to understand before you enter your own pool reading.
Pool salt is below target
Inputs
Add about 75 lb of salt, then start with a 56 lb first dose and retest.
Useful when a salt system reports low salinity after rain, refill, or splash-out.
Pool salt is too high
Inputs
Replace about 5,769 gal of water, roughly 38.5% of the pool.
Useful when the generator warns high salt and adding chemicals will not fix the reading.
Pool size is unknown
Inputs
About 17,235 gallons before salt or dilution math.
Useful before buying salt bags or comparing test-strip results to a target range.
Calculate the estimated salt weight needed to move from current ppm to target ppm, with purity adjustment and bag conversion.
Estimate pool gallons from simple rectangle, round, and oval dimensions in imperial or metric units.
If salinity is too high, estimate how much water to drain and replace to approach the target level.
Why this calculator is different
The brand selector makes the ppm target visible for common salt chlorine generator families such as Hayward, Pentair, Intex, and CircuPool. Treat these as practical presets and confirm the exact range in your equipment manual.
Volume, salt addition, bag conversion, estimated purchase cost, purity adjustment, and drain-and-refill dilution are kept in one workflow so you can move from measurement to action faster.
The result area highlights a retest-first reminder because adding too much salt is harder to fix than adding the remaining amount later.
For best predictability, use pool salt labeled near 99.8% purity. Product recommendations can be added later once affiliate links are configured.
The purchase planner rounds the calculated salt weight up to whole 40 lb, 20 kg, or 25 kg bags and multiplies by your local price per bag. It is an estimate for shopping convenience, not a live product price.
Brand presets
Dedicated brand calculator pages keep each common salt system target visible while still letting you edit the ppm value for the exact model installed on your pool.
FAQ
The amount depends on your pool volume, current salinity, target salinity, and salt purity. This calculator estimates the salt weight in pounds and kilograms, then converts it into common bag sizes.
Salt chlorine generators use different target ranges by brand and model. Use the brand preset as a starting point, then confirm the exact target in the equipment manual or control panel.
Salt does not evaporate out of the pool. If the salt level is too high, the common correction is to drain a calculated portion of water and refill with fresh water, then retest.
This calculator provides maintenance estimates for residential saltwater pools. It does not replace the manual for your salt chlorine generator, professional service advice, or local water safety requirements. Always circulate water and retest before making a second adjustment.