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pH & pOH Calculator
Convert between pH, pOH, [H⁺] and [OH⁻] — enter any one value and get the other three with the log algebra shown.
Calculator
Results update as you type. Every step of the working is shown below.
Examples:
Result
Enter values above — the answer appears here instantly, with full working.
Formula used
pH = −log₁₀[H⁺] · pOH = −log₁₀[OH⁻] · pH + pOH = pKw
Every result substitutes your values into this relation step by step above.
Assumptions
- Concentrations stand in for activities — exact for dilute solutions only.
- Kw depends on temperature: 25 °C default; other temperatures use a linearized pKw.