Pool Calculator
Free tools for volume, shock, chlorine, salt, alkalinity and stabilizer.
Calculate your pool volume
Choose what you need to calculate
Pool Shock Calculator
Calculate exactly how much shock to add.
Chlorine Calculator
Find the right chlorine dose for your FC target.
Pool Stabilizer Calculator
Calculate CYA and cyanuric acid additions.
Alkalinity Calculator
Balance total alkalinity with confidence.
Pool Chemical Calculator
Plan common pool chemical adjustments.
Pool Turnover Calculator
Estimate your filtration turnover time.
Above Ground Pool Calculator
Estimate volume for an above-ground pool.
Common pool chemical doses
| Pool size | Shock (10 ppm FC) | Liquid chlorine (12.5%) | Salt for +1,000 ppm | Baking soda for +10 ppm TA |
|---|---|---|---|---|
| 10,000 gal | 1.2 lb | 1.0 gal | 83 lb | 1.3 lb |
| 15,000 gal | 1.8 lb | 1.5 gal | 125 lb | 2.0 lb |
| 20,000 gal | 2.5 lb | 2.0 gal | 167 lb | 2.6 lb |
| 25,000 gal | 3.1 lb | 2.5 gal | 208 lb | 3.3 lb |
| 30,000 gal | 3.7 lb | 3.0 gal | 250 lb | 4.0 lb |
What does my pool need?
Frequently asked questions
How do I calculate my pool volume?
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.