pH calculator
pH from [H⁺] or [H⁺] from pH.
Calculator
How to use
pH
$$\text{pH} = -\log_{10}[H^+]$$
Mind significant figures in logs; the tool uses standard definitions.
Educational use only. Double-check values for labs, homework, and exams.
pH from [H⁺] or [H⁺] from pH.
$$\text{pH} = -\log_{10}[H^+]$$
Mind significant figures in logs; the tool uses standard definitions.
Educational use only. Double-check values for labs, homework, and exams.
Model / formula
pH = −log₁₀[H⁺] ([H⁺] in mol/L)