pOH Table: pOH by pH value
Reference table of poh for pOH across a range of ph value values — exact, engine-computed figures you can read off at a glance.
pOH Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
pOH
10.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the pOH Calculator
The pOH Calculator works out your poh in an instant. Enter ph value and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the ph value.
- Read off your poh — the calculator updates automatically, with no button to press.
Formula
The pOH Calculator uses the formula:
pOH = 14 - pH value
Worked example
For example, with ph value of 4, the poh is 10.00.
| pH value | 4 |
|---|
| pOH | 10.00 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Subtract pH from 14. A pH of 4 gives a pOH of 10.
At 25°C, the water ion product makes pH and pOH always add to 14.
It measures the hydroxide ion concentration, the basic counterpart to pH for acidity.
Yes. The 14 value is for 25°C; at other temperatures the sum shifts slightly.
The pOH Calculator uses the formula: pOH = 14 - pH value. For example, with ph value of 4, the poh is 10.00.
Enter the ph value. Read off your poh — the calculator updates automatically, with no button to press.
Related guides
How to Calculate pOH: Formula, Steps & Examples
Learn how to calculate pOH — the formula explained step by step, with worked examples and a free calculator to check your answer.