Pool Salt Calculator
Work out how much salt is needed to raise salinity from your measured reading to the target your salt chlorinator manufacturer specifies.
Get your target from your own manual
This calculator deliberately has no default target ppm. Salt chlorinators differ, and the wrong target can damage a cell or void a warranty. Read the target range in your chlorinator manual and enter it below.
How this is calculated
salt (lb) = max(0, target ppm − current ppm) × gallons × 8.345404 ÷ 1,000,000 ÷ purity fraction.
8.345404 is the weight in pounds of one US gallon of water, so ppm converts directly to pounds of salt per million pounds of water.
Products mentioned in this guide
These are product categories referenced by the guide, not tested or ranked picks. Check the product description, your pool or equipment model, and the seller listing before buying.
Salinity test kit or meter
Used to read current salt level in ppm before adding any salt.
Places to check