Chemistry calculator
pH Calculator
Calculate pH and pOH from hydrogen ion concentration.
Formula
pH formula
This simplified estimate assumes the common 25 C water relationship for pH and pOH.
pH = -log10([H+])
1e-6 mol/L hydrogen ion concentration gives pH 6.
FAQs
What concentration unit should I use?+
Enter hydrogen ion concentration in mol/L.
What does lower pH mean?+
Lower pH means higher hydrogen ion concentration.
How does the pH Calculator calculate the result?+
It uses the pH formula: pH = -log10([H+]). 1e-6 mol/L hydrogen ion concentration gives pH 6.
What information do I need to use the pH Calculator?+
Calculate pH and pOH from hydrogen ion concentration.
How accurate is the pH Calculator?+
pH Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the pH Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Chemistry guide
How to use the pH Calculator
Calculate pH and pOH from hydrogen ion concentration. The page also explains the pH formula and shows a practical example: 1e-6 mol/L hydrogen ion concentration gives pH 6.
- 1
Enter your details
Enter hydrogen ion concentration, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the pH formula: pH = -log10([H+]).
- 3
Compare scenarios
Change one or more inputs to see how they affect the pH Calculator result before you use the estimate.
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