What is the pH Calculator?
pH measures how acidic or basic a solution is on a 0–14 scale (at 25 °C). Enter any one of pH, pOH, [H⁺] or [OH⁻] – or the concentration of a strong acid (like HCl) or strong base (like NaOH) – and the calculator finds the rest, with a colour scale.
How to use the pH Calculator
- Choose what you know.
- Enter the value (concentrations in mol/L, e.g. 0.01 or 1e-3).
- Read pH, pOH and both concentrations.
Formulas
- pH = −log₁₀[H⁺]
- pOH = −log₁₀[OH⁻]
- pH + pOH = 14 (at 25 °C)
- [H⁺] = 10^(−pH)
This pH Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech