Pool maintenance math, cleaned up

Know what to add before you add it.

Calculate pool salt, estimate gallons, or plan a chlorine shock dose from the numbers on your test kit. Each tool gives the answer first, then the safety notes and formulas behind it.

Calculate pool salt Estimate gallons

Choose by problem

Three calculators for the most common pool math.

The pages are connected: if you do not know gallons, estimate volume first; if you already have a salt or chlorine reading, go straight to the dosing calculator.

Saltwater pools

Pool Salt Calculator

Find how many pounds and bags of pool salt to add from your gallons, current salt ppm, and target ppm.

Use when Salt reading is low

You get Pounds, bags, cost, and a staged add plan

High-salt warning
40 lb bag shopping list
Maintenance log

Calculate salt

Pool gallons

Pool Volume Calculator

Estimate gallons for rectangular, round, or quick surface-area pool measurements before dosing chemicals.

Use when Gallons are unknown

You get A gallons estimate you can send into the salt calculator

Rectangle and round pools
Average-depth inputs
Prefills salt calculator

Estimate gallons

Chlorine dose

Pool Shock Calculator

Estimate a shock dose from pool gallons, current free chlorine, target ppm, and product strength.

Use when Chlorine needs a controlled raise

You get Estimated liquid chlorine or cal-hypo amount

Solid or liquid products
PPM increase shown
Safety reminder

Estimate shock

STEP 1 Test first

Use a current salt or chlorine reading instead of guessing from last week.

STEP 2 Confirm gallons

Chemical doses scale with water volume, so use a reasonable pool gallons estimate.

STEP 3 Add in stages

Start below the full calculated amount when overshooting would create extra work.

STEP 4 Retest

Circulate, brush if needed, then retest before making a second adjustment.

Pool calculator workflow

Start with the measurement that controls the dose.

Pool chemical math usually starts with two numbers: how many gallons are in the pool and how far the current test reading is from the target. If gallons are uncertain, estimate pool volume first. If gallons are known, use the salt calculator for salt ppm changes or the shock calculator for a planned free chlorine raise.

The calculators show the result first, then keep the formula visible so the answer can be checked. Salt uses gallons and ppm increase to estimate pounds and 40 lb bags. Volume uses shape, water dimensions, and average depth. Shock uses gallons, current chlorine, target chlorine, product strength, and whether the product is liquid or solid.