pH & pOH Calculator
Calculate pH from hydrogen ion concentration.
pH & pOH measurements
Enter your values, then calculate.
Result
How to calculate ph & poh
This calculator finds pH from hydrogen ion concentration, or pOH from hydroxide ion concentration — the fundamental logarithmic measures of acidity and basicity in chemistry.
How the calculation works
pH = −log₁₀(Hydrogen ion concentration), and pOH = −log₁₀(Hydroxide ion concentration).
Example
A hydrogen ion concentration of 1×10⁻ mol/L: pH = −log₁₀(1×10⁻³) = 3.
Frequently asked questions
Is the pH & pOH Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Is my data saved when I use this calculator?
No. Calculations run entirely in your browser; nothing you enter is sent to or stored on a server.
pH & pOH Calculator
pH = −log₁₀(Hydrogen ion concentration), and pOH = −log₁₀(Hydroxide ion concentration).
Let's understand your ph & poh result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for pH & pOH
- Lower pH values indicate higher hydrogen ion concentration (more acidic); higher pH values indicate lower concentration (more basic/alkaline).
- pH and pOH are related by pH + pOH = 14 at 25°C — you can convert between them once you calculate one using this relationship.
Common pH & pOH Mistakes to Avoid
- Confusing pH (based on hydrogen ion concentration, measuring acidity) with pOH (based on hydroxide ion concentration, measuring basicity) — they measure related but different aspects of a solution.
When to Use This Calculator
This calculator finds pH from hydrogen ion concentration, or pOH from hydroxide ion concentration — the fundamental logarithmic measures of acidity and basicity in chemistry.