About Pool Chem Calculators

What this site is

Maintaining a pool requires weekly chemical adjustments to keep water safe, clear, and balanced. Pool owners often ask: "How much chlorine do I add?" or "What's causing my cloudy water?"

Pool Chem Calculators provides specialized calculators that give you exact chemical amounts based on your pool size, current levels, and target chemistry. All calculations use industry-standard formulas and best practices from pool professionals.

What these calculators are (and aren't)

The results you see are dosing estimates based on proven chemistry formulas. They help you determine how much of each chemical to add for your specific pool.

However, this site does not replace professional pool service, water testing labs, or expert consultation for severe water quality problems. Always test your water before adding chemicals and make adjustments gradually.

Safety reminder: Follow all product label instructions, wear proper protective equipment when handling pool chemicals, and never mix chemicals together.

Our calculators (how they work)

We provide specialized calculators for every aspect of pool chemistry:

• Pool Volume Calculator — Calculate pool size to determine correct chemical dosing
• Pool Chemical Calculator — All-in-one dosing for chlorine, pH, alkalinity & shock in a single calculation
• Chlorine Calculator — Add the right amount of sanitizer for safe swimming
• pH Calculator — Raise or lower pH for optimal chlorine effectiveness
• Shock Calculator — Treat cloudy or green water with proper shock dosing
• SLAM Calculator — Step-by-step algae elimination using the SLAM method for green or cloudy pools
• Pool Opening Calculator — Full spring startup chemical plan in a single calculation
• Alkalinity Calculator — Stabilize pH by balancing total alkalinity
• Salt Calculator — Add salt for saltwater chlorine generators
• Stabilizer Calculator — Protect chlorine from UV degradation with cyanuric acid
• CYA / FC Calculator — Find minimum, target, and SLAM free chlorine levels based on your stabilizer level
• Pool Dilution Calculator — Calculate how many gallons to drain and refill to lower CYA, calcium hardness, salt, or TDS
• Muriatic Acid Calculator — Lower pH and alkalinity safely
• Calcium Hardness Calculator — Prevent corrosion and scaling
• Hot Tub Calculator — Calculate chemicals for spas and hot tubs
• LSI Calculator — Check overall water balance with the Langelier Saturation Index
• Chemical Cost Calculator — Budget annual pool maintenance expenses

Each calculator uses specific formulas (e.g., "1 lb of calcium chloride per 10,000 gallons raises hardness by 10 ppm"). Results are displayed in practical units (pounds, ounces, gallons) that match how chemicals are sold.

Formula sources include industry references from the Association of Pool & Spa Professionals (APSP), the National Swimming Pool Foundation (NSPF), and established pool chemistry standards including the Langelier Saturation Index and the Taylor Technologies FAS-DPD methodology. All dosing formulas are based on sodium hypochlorite chemistry, calcium hypochlorite concentrations, and EPA-registered sanitizer specifications.

Need pool supplies?

After using our calculators to determine what your pool needs, visit our Pool Supplies page for recommended test kits, chemicals, and maintenance equipment. We've curated products commonly needed for the calculations we provide.

Privacy-first by default

All calculations run locally in your browser. The numbers you enter (pool volume, pH levels, chlorine readings) are not stored and are not transmitted to our servers.

Analytics are configured in a privacy-friendly way and do not use advertising cookies or cross-site tracking. See our Privacy Policy for details.

Affiliate disclosure

Pool Chem Calculators is a free resource supported by affiliate commissions. When you click product links (marked "Shop on Amazon →"), we may earn a small commission if you make a purchase. This doesn't affect the price you pay.

We only recommend products relevant to the calculations (pool chemicals, test kits, equipment). Product recommendations are based on what's needed for the specific calculator, not on commission rates.

You are never required to purchase anything. All calculators work completely free, and you can buy chemicals anywhere you prefer.

Recommended starting points

• Calculate your pool volume (needed for all other calculators)
• Calculate all chemicals at once (enter test readings once, get every dose)
• Calculate chlorine dosing (most common weekly task)
• Emergency shock treatment (for cloudy or green water)
• Check overall water balance (advanced users)
• Check your CYA and chlorine targets (if pool keeps going green despite adding chlorine)

Questions or feedback?

If you have questions about our calculators, found an error, or have suggestions for improvements, please contact us. We respond to all inquiries.