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Manual pH Calibration Calculator


This calculator attempts to correct the pH reading of an uncalibrated, uncalibratable, or improperly calibrated digital pH meter. It can also be used if your pH meter can only be calibrated at cetain pHs and you would like to calibrate it with reference solutions at arbitrary pHs.

Simply enter two reference readings on the left hand side and the actual reading to be corrected on the right. It does not matter if your pH meter is already (incorrectly) calibrated, the calculations here are not affected by any existing internal two-point calibration.

However, note that this calculator cannot account for a shot pH probe. If your pH probe is providing inconsistent or noisy results to your pH meter, the calculations here will not help you.

First Reference Solution

Actual pH:
 pH Units

Read pH:
 pH Units

Second Reference Solution

Actual pH:
 pH Units

Read pH:
 pH Units

Reading to Correct

Reading*:
 pH Units



Corrected Reading:
 pH Units

* The precision used here will determine the output precision.



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