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
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about ph calculator.
Molar Mass Calculator
Compute the molar mass of any chemical formula — H₂O, NaCl, C₆H₁₂O₆…
Density Calculator
Solve density, mass or volume — ρ = m / V — for any two knowns.
Average Calculator
Mean, median, mode, sum, range — instant statistics for any list of numbers.
Exponential Growth Calculator
A = P · e^(rt) — population, bacteria, compound growth.