Calculating your poh is straightforward once you know the pOH formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the pOH Calculator.
What is pOH?
The pOH calculation tells you your poh from a few simple inputs. The figure you are solving for here is the poh.
The pOH formula
The core formula is:
pOH = 14 - pH valueHere is what each input means:
- pH value — a number. Example: 4.
How to calculate it step by step
- Write down the ph value (for example, 4).
- Apply the formula above to get your poh.
- Double-check the result with the pOH Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| pH value | 4 |
| pOH | 10.00 |
With ph value of 4, the poh works out to 10.00.
Example 2
With ph value of 8, the poh works out to 6.00.
| Result | Value |
|---|---|
| pOH | 6.00 |
Example 3
With ph value of 2, the poh works out to 12.00.
| Result | Value |
|---|---|
| pOH | 12.00 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the pOH Calculator does it instantly, for free, with the formula and a worked example built in.
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