Pool stabilizer calculator

Calculate CYA without overshooting it.

Enter pool gallons, current CYA ppm, target CYA ppm, and dry stabilizer strength. This pool CYA calculator estimates pounds and ounces to add, or dilution when stabilizer is already too high.

Outdoor poolsProtect chlorine from sunlight.

High CYAPlan dilution, not more product.

Chlorine targetsCYA changes the target you choose.

Pool gallons

Dry stabilizer strength %

Current CYA ppm

Target CYA ppm

dry stabilizer

ounces

next step

Enter your CYA readings to see the stabilizer plan.

CYA is slow to correct. Add dry stabilizer in stages, wait for it to dissolve and mix, then retest before adding more.

Check chlorine Shock dose

Next step

After CYA changes, revisit chlorine targets.

Stabilizer changes how you choose a free chlorine target. Let dry CYA dissolve, retest, then use chlorine or shock calculators with the new reading.

Check chlorine Shock dose Confirm gallons

Formula and review notes

Pool stabilizer calculation method

Last updated July 2, 2026. This calculator is an estimate for planning pool maintenance, then retesting before making another adjustment.

Formula used

Dry CYA pounds = pool gallons x ppm increase x 0.00000834 / product strength. Dilution fraction = 1 - target CYA / current CYA

Assumptions

The dose assumes dry cyanuric acid. Liquid conditioner products vary by concentration and should follow the product label.
If current CYA is above target, the calculator switches to dilution guidance instead of recommending more stabilizer.
CYA can dissolve and show on tests slowly, so large corrections should be staged and retested.

Reference checks

Pounds formula for ppm dosing Water-treatment formula using gallons x ppm x 8.34.
Pool chemistry adjustment guide Public-health pool adjustment table noting CYA is lowered by draining a portion of water.
CDC Model Aquatic Health Code Public pool health-code context for disinfectant and stabilizer topics.

How it works

Stabilizer is useful when it is low and stubborn when it is high.

Semrush validation showed `pool stabilizer calculator` as the main opportunity in this support cluster, with `pool cya calculator`, `cya calculator pool`, and “how much stabilizer to add” variants folded into the same search intent.

The math is straightforward when CYA is low: calculate the ppm increase and convert that ppm change into pounds of dry cyanuric acid. The risk is overshooting. Once CYA is high, adding chemicals is not the usual fix; the practical correction is dilution through partial drain and refill, subject to local rules.

Dry CYA quick examples

Pool	Raise 10 ppm	Raise 20 ppm	Raise 30 ppm
10,000 gal	0.8 lb	1.7 lb	2.5 lb
15,000 gal	1.3 lb	2.5 lb	3.8 lb
20,000 gal	1.7 lb	3.3 lb	5.0 lb

Preparation checklist

Stabilizer calculator supplies

Use these reminders to check labels, test readings, and supplies before dosing.

Label first

Stabilizer Cyanuric acid stabilizer Used when an outdoor pool CYA reading is below the target range. Confirm whether the product is dry cyanuric acid and follow the label for dissolving and filter operation.

Testing CYA test kit Needed before adding stabilizer and after the product has fully dissolved. Use a test that can read the range you are targeting; avoid large corrections from a stale strip result.

Pool stabilizer FAQ

Questions before changing CYA.

These answers cover CYA, cyanuric acid, dry stabilizer, high-stabilizer dilution, and how stabilizer connects to chlorine targets.

How much stabilizer should I add to my pool?

Use pool gallons, current CYA ppm, and target CYA ppm. For dry cyanuric acid, the planning formula is gallons x ppm increase x 0.00000834 pounds.

Is pool stabilizer the same as CYA?

Yes. Pool stabilizer usually means cyanuric acid, often shortened to CYA. It protects outdoor chlorine from sunlight but can make chlorine less effective when too high.

How much CYA raises 10,000 gallons by 10 ppm?

About 0.83 pounds, or about 13 ounces, of dry cyanuric acid raises 10,000 gallons by roughly 10 ppm before accounting for product purity and label directions.

What if my CYA is already above target?

Do not add stabilizer. CYA does not usually drop quickly on its own, so partial drain and refill is the common correction when the reading is truly high.

Can liquid stabilizer use the same calculator?

Liquid conditioner products vary by concentration. This page is built for dry cyanuric acid; use the product label for liquid stabilizer or convert only when the label gives an equivalent strength.

Should indoor pools use stabilizer?

Many indoor pools do not need CYA because there is no sunlight load. Follow local code, equipment guidance, and product labels before adding stabilizer indoors.

Does CYA change chlorine dosing?

CYA does not change the ppm weight formula for adding chlorine, but it can change the free chlorine target you choose. Higher CYA often means a higher chlorine target is needed.

How long should I wait before retesting CYA?

Cyanuric acid can dissolve and register slowly. Add in stages, circulate as directed by the label, and retest after the product has had time to fully mix.