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Water chemistry calculations with visible formulas, unit-aware inputs, stated limitations, and source references. No login is required and entered values remain in your browser.
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Alkalinity Calculator
Alkalinity (mg/L as CaCO₃) = (A − B) × N × 50,000 ÷ sample mLCalculate total alkalinity as CaCO3 from acid titration volume, normality, sample volume, and blank correction.
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Chlorine Dose Calculator
Active chlorine required (g) = Δ chlorine (mg/L) × water volume (L) ÷ 1,000Estimate active chlorine demand and liquid or dry product quantity from water volume, current residual, target residual, strength, and density.
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Langelier Saturation Index Calculator
LSI = measured pH − pHsCalculate LSI from pH, temperature, total dissolved solids, calcium hardness, and total alkalinity using the saturation-pH equation.
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Dilution Calculator
C₁V₁ = C₂V₂Use C1V1 = C2V2 to calculate the stock solution and diluent volumes needed for a lower target concentration.
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Molarity Calculator
Molarity (mol/L) = mass (g) ÷ molar mass (g/mol) ÷ volume (L)Calculate moles and molarity from solute mass, molar mass, and final solution volume in litres or millilitres.
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Water Hardness Converter
All outputs are converted from mg/L as CaCO₃Convert hardness reported as mg/L CaCO3 to ppm, mmol/L, meq/L, German degrees, French degrees, and grains per US gallon.
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Pool Volume Calculator
Volume = surface area × average depthEstimate rectangular, circular, or oval pool volume in litres, cubic metres, and US gallons from measured dimensions and average depth.
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Water Test Result Interpreter
Screening only: each result is compared with its stated reference bandScreen residential pool pH, free chlorine, total alkalinity, and calcium hardness against clearly stated reference bands.
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