Hydrogen Ion Concentration Calculator — Free Online Tool
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Hydrogen Ion Concentration

Calculate [H⁺] from pH, pOH, or [OH⁻]

Formulas: [H⁺] = 10-pH  |  pH + pOH = 14  |  [H⁺] × [OH⁻] = 1.0 × 10-14
Input Parameters

Calculation Results

⚠️ The relationship [H⁺] × [OH⁻] = 1.0 × 10-14 is strictly valid at standard room temperature (25 °C / 298 K). At different temperatures, the autoionization constant of water (Kw) shifts, which alters the exact neutral pH point.

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