pH Calculator
Calculate pH from hydrogen ion concentration, or [H⁺], pOH and [OH⁻] from pH.
Enter your values and press Calculate.
How to use the pH calculator
Calculate pH from hydrogen ion concentration, or [H⁺], pOH and [OH⁻] from pH. Enter your values above and press Calculate; the result appears instantly, and the formula used is shown below so you can check the working.
Formula
pH = −log₁₀[H⁺]; pH + pOH = 14 at 25 °C.
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