10 Helpful Pool Saltwater Apps and Online Calculators

How Much Salt Should I Put in My Pool?

Water line on inside of blue pool lining with a brick floor on top closeup

The Spruce / Michelle Becker

How much salt should you put in your swimming pool? Provided you have a chlorine generator—that thing that turns salt into chlorine—you're going to need to calculate the correct amount of salt to add. You can't just salt it liberally, like it's a big, juicy slab of steak on the barbecue. We've assembled a list of saltwater (or salt water) calculators—some online, some that are smartphone apps—to help you get it right.

It's best to consult your saltwater generator's website for specific instructions on adding salt. If you don't recall the brand or just need a handy reference tool, these suggestions will help you with the job.

In case you aren't quite convinced that salt chlorinators are the right way to clean your pool, discover 10 Smart Reasons for Having a Saltwater Pool.

Then, get back to your calculations. The list is alphabetical.

H2O Co.

H2O Company's site provides a quick reference table in which you find your current salt level and pool volume in gallons to come up with the saltwater needed for your particular pool (in pounds).

Inyo Pools

Inyo provides an easy salt table to check for how many pounds of salt to add according to your size of pool. 

Pentair Salinity Calculator

With Pentair's calculator, you set the Current Salt Level slider to match your own pool’s current salinity reading. Then, simply adjust the “Pool Volume” slider to match up with the volume of your swimming pool. Don't know the volume of your pool offhand? View Pentair's online pool volume calculator to assist you with the task.

After the information has been entered, you’ll discover the amount of salt needed to bring your pool to the ideal salinity of 3,400 ppm.


In addition to salt, this iPhone app calculates calcium hardiness, borate, chlorine, and more. This app will calculate how much of each chemical you need to add to get your water into perfect balance. New features reports previous calculations, ease of use by removing login requirements, and allows you to set multiple pools and tests (good for pool service professionals).

The Pool Calculator

Were you relieved when you fulfilled the math requirements for high school or college and never looked back? You're not alone. For the STEM-challenged, this calculator promises to do all the math involved in figuring out precisely how to manage your swimming pool's chemistry. It even links to an explanation of what all those terms like "total hardness" and "adjusted or corrected total alkalinity" mean. You'll be a pool chemistry wiz in no time. 

Pool Doctor

Pool Doctor helps you maintain a clean pool by adjusting the chlorine, bromine, salt, pH, total alkalinity, calcium hardness, and cyanuric acid levels in your pool. The app provides all of its results and descriptions in pounds, ounces, grams, kilograms, liters, gallons, and even in the number of scoops (you can enter custom scoop sizes). This app supports regular, salt-water, or bromine pools and is designed for both iPhone and iPad.

Pool Kit

Android users will be happy that there is another app available to calculate pool chemicals, including salt chlorine. Even better, it's free.

Pool Pal

This Android app tracks things like free chloramine, hydrogen peroxide, pH, total alkalinity, calcium hardness, stabilizer, salt, borates, water temperature, backwashing, CC, filter cleaning, flow, and pressure.

Pool Tech Oklahoma City

If you want something simple, basic, and to-the-point, consult this calculator from Pool Tech Oklahoma City. 

Water Chemistry Calculator

Hayward's guide suggests that you test your pool for the current level of salt before adding more. In addition to its salt guide, this handy reference guide offers tips on adjusting cyanuric acid, total alkalinity, total hardness, pH levels and pool volume.