pH and pOH calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
pH = −log₁₀[H⁺] · pH + pOH = 14
Where this usually goes wrong
The 14 holds at 25 °C. Concentrations are in mol/L.
Worked example
1 × 10⁻⁴ mol/L is pH 4.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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