Pool Chemistry Calculators
Calculate exact chemical amounts for crystal clear pool water.
Free tools for chlorine, pH, shock, alkalinity, and more.
No sign-ups. No stored data. Instant results.
👉 New to pool chemistry?
Start with the Pool Volume Calculator — you need to know your pool size before calculating any chemicals.
Calculate pool chemicals for any pool type
🧪 Chlorine & shock treatment
Calculate how many chlorine tablets for your pool, liquid chlorine dosing, and shock treatment amounts for cloudy or green water
⚖️ pH & alkalinity balance
Determine muriatic acid amounts to lower pH, or how much baking soda to raise alkalinity and stabilize water chemistry
🧂 Salt water pools
Salt pool chemical calculator for proper salt levels, plus pH and alkalinity adjustments specific to saltwater systems
♨️ Spas & hot tubs
Spa chemistry calculator with dosing adjusted for smaller water volumes and higher temperatures
Essential Calculators
Most pool owners use these weekly
Pool Volume Calculator
Find your pool size in gallons — required for all other calculations
Start hereChlorine Calculator
How much chlorine to add for safe swimming
pH Calculator
Raise or lower pH for comfort and equipment protection
Shock Calculator
Fix green or cloudy water fast
EmergencyCommon Adjustments
Balance your pool chemistry
Alkalinity Calculator
Balance total alkalinity to stabilize pH
Salt Calculator
Salt water pool chemical calculator for proper salt levels
Stabilizer Calculator
Cyanuric acid to protect chlorine from sunlight
Muriatic Acid Calculator
Calculate exact muriatic acid amounts to lower pH and alkalinity
Advanced Tools
For experienced pool owners
🛒 Need Pool Supplies?
Now that you know what chemicals you need, check our recommended Pool Supplies page for test kits, chlorine, shock, pH balancers, and maintenance tools.
Pool chemistry quick tips
🎯 Test weekly
Check pH and chlorine levels at least once per week during swimming season
📐 Know your volume
Always start with an accurate pool volume measurement for precise chemical dosing
☀️ Add chemicals at dusk
UV rays break down chlorine — add chemicals in the evening for best results
🔄 Balance in order
Fix alkalinity first, then pH, then chlorine — this prevents constant rebalancing
Common pool chemistry questions
How often should I test my pool water?
Test pH and chlorine at least once per week during swimming season. After heavy rain, high usage, or if the water looks cloudy, test more frequently.
What's the ideal chlorine level for a pool?
Free chlorine should be between 1-3 ppm (parts per million) for regular swimming. After shocking, wait until chlorine drops below 5 ppm before swimming.
Why does my pH keep rising?
High pH is often caused by low alkalinity, high pH source water, or certain sanitizers. Use the Alkalinity Calculator to stabilize pH, then adjust pH with muriatic acid if needed.
Can I add all chemicals at once?
No. Add chemicals separately, allowing the pump to circulate for at least 4 hours between additions. Never mix chemicals before adding them to the pool.
Do these calculators work for saltwater pools?
Yes! Saltwater pools still need pH, alkalinity, and stabilizer adjustments. Use the Salt Calculator for salt-specific dosing.
How much muriatic acid do I add to my pool?
The amount depends on your pool volume and how much you need to lower pH or alkalinity. For a typical 20,000 gallon pool, 1 quart (32 fl oz) of muriatic acid lowers pH by approximately 0.2 or alkalinity by 10 ppm. Use our Muriatic Acid Calculator for exact dosing based on your specific pool size and target levels.
How many chlorine tablets does my pool need?
Most pools need 1-3 chlorine tablets per week depending on pool size, sunlight exposure, and bather load. A standard 3-inch tablet treats approximately 10,000 gallons. Use our Chlorine Calculator to determine the exact amount of chlorine tablets, liquid chlorine, or granular chlorine your pool needs to maintain 1-3 ppm free chlorine.