pH Calculator
pH from [H⁺] and reverse — with pOH, [OH⁻] and temperature.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use pH Calculator
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Pick a mode: '[H⁺] → pH' or 'pH → [H⁺]'.
- 2
Step 2. Enter the value (e.g. 1e-7 mol/L for [H⁺], or 7.0 for pH).
- 3
Step 3. Optionally adjust the temperature (default 25 °C) to update Kw.
- 4
Step 4. See pH, pOH, [H⁺], [OH⁻] and the pH scale indicator update instantly.
Why use this tool
Frequently asked questions
Everything you might want to know about ph calculator.
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