pH Calculator

pH is the negative base-10 logarithm of hydrogen ion concentration [H⁺]. This calculator converts between [H⁺] (mol/L) and pH — the fundamental measure of acidity

The calculator uses the standard published formula for ph calculation. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: pH = −log₁₀([H⁺]). Each step in the calculation is shown so you can verify the result manually.