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pH and pOH Calculator

Convert between pH, pOH, [H⁺] and [OH⁻] at 25 °C.

Enter a pH value.

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How to use this calculator

Enter a pH value to get pOH and ion concentrations at 25 °C.

Formula / method used

pH + pOH = 14, [H⁺] = 10^−pH

Frequently asked questions

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