pH Calculator
Enter any one value - pH, pOH, hydrogen ion concentration or hydroxide ion concentration - and get all the others.
| Quantity | Value |
|---|---|
| pH | |
| pOH | |
| [H+] (mol/L) | |
| [OH-] (mol/L) |
How to use
- Choose which value you know from the dropdown.
- Type the value. For concentrations use mol/L, for example 0.001 or 1e-3.
- All four quantities are calculated at once, with the acid/base classification.
Note
The relations used are pH + pOH = 14 and [H+][OH-] = 1e-14 at 25°C. Values outside the 0 to 14 pH range are possible for very strong acids and bases and are shown with a warning.