Pool size	Shock (Cal-hypo 68%, 10 ppm FC, CYA 30)	Liquid chlorine (12.5%)	Salt for +3,200 ppm
10,000 gal	1.2 lb	0.62 gal	267 lb
15,000 gal	1.8 lb	0.93 gal	400 lb
20,000 gal	2.5 lb	1.24 gal	534 lb
25,000 gal	3.1 lb	1.54 gal	667 lb
30,000 gal	3.7 lb	1.85 gal	801 lb

What does my pool need?

Algae or chlorine smell

Calculate a shock dose based on your test results.

Daily chlorine dose

Maintain 1–3 ppm FC with bleach, cal-hypo or pucks.

CYA too high or too low

Work out how much stabilizer your pool needs.

Need a more precise volume?

Calculate gallons, liters, and cubic meters from the shape and depth.

Starting a saltwater pool?

Calculate pounds, kilograms, and 40 lb bags of salt to reach 3,200 ppm.

pH out of range?

Calculate soda ash or muriatic acid for your target pH.

Alkalinity out of range?

Calculate baking soda or acid for your target alkalinity.

Frequently asked questions

How does the quick volume estimate work?

Multiply length by width by average depth, then multiply by 7.48 for US gallons. Our quick calculator above does this for you.

How much shock do I need?

It depends on pool volume, current FC, CYA, the problem you are treating, and the shock product strength. Use the Pool Shock Calculator for an exact dose.

How long after shocking can I swim?

Wait until free chlorine returns to the normal 1–4 ppm range. This typically takes 8–24 hours, depending on sunlight and circulation.

Can I use metric measurements?

Yes. Switch the volume calculator to metric units and enter dimensions in meters for a liter estimate.

What is the best time to add pool chemicals?

Add shock at dusk or after sunset. Keep the pump running so the chemical disperses evenly.

Do I need to test before adding shock?

Yes. Test free chlorine and CYA first so the dose matches your water instead of guessing.