pH Calculator

Calculate pH from hydrogen ion concentration or vice versa.

Calculation Mode

[H⁺] concentration (mol/L)

Result

Enter the required values to calculate.

Description

pH is a measure of hydrogen ion concentration, defined as pH = -log₁₀[H⁺]. This calculator supports: pH from [H⁺], [H⁺] from pH, weak acid pH (using pKa), and buffer pH (Henderson-Hasselbalch equation).

How to use

Select a calculation mode. For pH from [H⁺], enter the H⁺ concentration. For weak acids, enter concentration and pKa. For buffers, enter acid and conjugate base concentrations and pKa.