Electrode Potential Converter Calculator

Calculator Inputs

Measured potential

Input unit

Temperature (°C)

Source reference electrode

Target reference electrode

Liquid junction correction (V)

Custom source vs SHE (V)

Custom target vs SHE (V)

Displayed decimals

Reference potentials use common 25°C values with simple linear temperature corrections. Always verify exact electrode specifications for regulated, published, or instrument-critical work.

Example Data Table

Case	Measured Value	Source Reference	Target Reference	Temperature	Approx. Converted Value
ORP probe reporting to SHE	125 mV	Ag/AgCl Saturated KCl	SHE	25°C	322 mV
Corrosion survey conversion	-0.850 V	Cu/CuSO4	SCE	25°C	-0.775 V
Lab comparison across scales	0.400 V	SCE	Ag/AgCl 3M KCl	30°C	0.428 V

Formula Used

E_{vs SHE} = E_measured + E_source + E_junction

E_target = E_{vs SHE} - E_{target reference}

E_{reference at T} = E_25°C + (T - 25) × temperature coefficient

The converter first places the measured value on the SHE scale. It then subtracts the target reference potential. A junction correction can shift the value when your setup needs an extra offset.

Temperature correction is modeled linearly for convenience. Real electrodes may deviate slightly with composition, filling solution strength, calibration state, and manufacturer design.

How to Use This Calculator

Enter the measured potential from your instrument.
Select whether the input value is in volts or millivolts.
Choose the source reference electrode used during measurement.
Choose the target reference scale for reporting or comparison.
Enter temperature and any known liquid junction correction.
Use custom reference values when your electrode specification differs.
Press Convert Potential to show the result above the form.
Download the conversion summary as CSV or PDF when needed.

FAQs

1. What does this converter actually change?

It changes the reporting reference scale. The measured chemistry stays the same, but the numerical potential shifts because each reference electrode has its own offset versus SHE.

2. Why convert to SHE?

SHE is the universal comparison baseline in electrochemistry. Converting through SHE helps align measurements from different instruments, publications, and reference electrodes.

3. Are the temperature corrections exact?

No. They are practical approximations for fast work. Use certified electrode documentation or instrument calibration data when exact compliance or publication-grade accuracy matters.

4. When should I use junction correction?

Use it when your method includes a known liquid junction offset or instrument correction. If you do not know the offset, leave it at zero.

5. Can I enter a custom reference potential?

Yes. Select the custom option and enter the reference value versus SHE in volts. This is useful for specialized electrodes or vendor-specific specifications.

6. Why do results differ from another table?

Differences usually come from filling solution concentration, temperature, sign convention, calibration drift, or a source table using a slightly different standard potential.

7. Is this suitable for corrosion and ORP work?

Yes, for quick conversions and reporting checks. Confirm method-specific standards before making pass-fail, compliance, safety, or long-term asset decisions.