How to use it
- Enter a positive hydrogen ion concentration in mol/L.
- Calculate the negative base-10 logarithm.
- Read the idealized numerical pH result.
pH Calculator
Calculate an idealized pH value from an entered hydrogen ion concentration.
Important: This calculator is for educational calculations only. It is not laboratory, medical, dosing, chemical handling, mixing, storage, synthesis, pressure-vessel, industrial, environmental, legal, or safety advice.
About the pH Calculator
The pH scale can be represented mathematically from an entered hydrogen ion concentration.
Formula
pH = −log10([H+]).
Example
An entered concentration of 1 × 10⁻⁷ mol/L produces an idealized pH of 7.
Notes
Real measurements can depend on activity, temperature and instrumentation. This page does not assess water, health, exposure or laboratory safety.