Pool Chemical Calculator
Free calculators for every pool chemical. Get exact dosages for chlorine, shock treatment, LSI water balance, and hot tub chemicals based on your pool size and current readings.
Chlorine Calculator
Calculate exact dosages for liquid chlorine, dichlor, or cal-hypo based on pool size and current readings.
Pool Shock Calculator
Calculate shock treatment dosage for algae blooms, cloudy water, or routine weekly maintenance.
LSI Calculator
Calculate the Langelier Saturation Index to check if your water is balanced, corrosive, or scale-forming.
Pool Volume Calculator
Calculate your pool volume in gallons based on shape and dimensions. Essential for accurate chemical dosing.
Hot Tub Chemical Calculator
Calculate exact chemical dosages for chlorine, bromine, pH, and alkalinity in spas and hot tubs.
Pool Chemical Dosage Guide
Proper pool chemical balance is essential for safe, clear water and to protect pool equipment from damage. Every pool is different, so chemical dosages must be calculated based on your specific pool volume and current water chemistry readings.
Essential Pool Chemical Levels
| Chemical | Ideal Range | Why It Matters |
|---|---|---|
| Free Chlorine | 1-5 ppm | Kills bacteria and algae |
| pH | 7.2-7.6 | Comfort and chlorine effectiveness |
| Total Alkalinity | 80-120 ppm | Buffers pH from swinging |
| Calcium Hardness | 200-400 ppm | Prevents corrosion and scaling |
| Cyanuric Acid (CYA) | 30-50 ppm | Protects chlorine from UV |
| LSI | -0.3 to +0.3 | Overall water balance index |
How to Use These Calculators
Know your pool volume
Use our pool volume calculator if you don't know your pool size in gallons.
Test your water
Use a test kit or test strips to get your current chemical readings.
Enter your readings
Input your pool size and current levels into the appropriate calculator to get exact dosages.
Pool Chemicals vs Hot Tub Chemicals
While pools and hot tubs use similar chemicals, the dosages and ideal ranges differ significantly due to water volume and temperature differences. Hot tubs typically use bromine instead of chlorine and require more frequent chemical adjustments due to the smaller water volume and higher bather load per gallon.
Frequently Asked Questions
What pool chemicals do I need to balance my water?
The main chemicals for pool water balance are chlorine (sanitizer), muriatic acid or sodium bisulfate (pH down), sodium carbonate (pH up), sodium bicarbonate (alkalinity up), calcium chloride (hardness up), and cyanuric acid (stabilizer). The exact amounts depend on your pool size and current water readings.
How do I calculate pool chemical dosages?
Pool chemical dosages depend on three factors: your pool volume in gallons, your current chemical readings, and your target levels. Use our free calculators to enter your pool size and current readings - we calculate the exact amount of each chemical needed.
What is the LSI and why does it matter for pool chemistry?
The Langelier Saturation Index (LSI) measures whether your pool water is balanced, corrosive, or scale-forming. An LSI between -0.3 and +0.3 is ideal. It factors in pH, temperature, calcium hardness, total alkalinity, and TDS. Our LSI calculator gives you instant results.
How often should I test and adjust pool chemicals?
Test chlorine and pH at least 2-3 times per week during swimming season. Test alkalinity, calcium hardness, and CYA weekly. Professional pool service operators typically test and adjust chemicals at every service visit.
What is the ideal chlorine level for a pool?
For pools with cyanuric acid (CYA), maintain free chlorine at 7.5% of your CYA level, typically 3-5 ppm. For pools without stabilizer, 1-3 ppm is sufficient. Use our chlorine calculator for exact dosages based on your pool size.
Can I use these calculators for hot tubs and spas?
Yes! We have a dedicated hot tub chemical calculator that accounts for the smaller water volume and higher temperatures of spas. Hot tubs require different chemical ranges than pools - for example, bromine is often preferred over chlorine.
Learn More About Pool Chemistry
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