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Free Nernst-equation calculator for electrochemical cell voltage. Compute E°cell and corrected Ecell from half-cell reduction potentials, reaction quotient Q, electron transfer number, and temperature.
Last updated: April 20, 2026
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Standard cell potential (E°cell)
1.1000 V
Cell potential (Ecell)
1.0704 V
Reaction quotient (Q)
10.0000
Nernst adjustment
0.029580 V
Interpretation
Cell potential is 1.0704 V using the Nernst equation at 25.0°C.
Method note:
Uses natural-log Nernst form: E = E° - (RT/nF) ln(Q). Sign conventions depend on balanced half-reactions.
Formula
E°cell = E°cathode - E°anode
Correction term
(RT/nF) ln(Q)
Interpretation
Cell spontaneity indicator
Cu/Zn setup with Q=10, n=2, 25°C
Standard potential
1.1000 V
Corrected potential
1.0704 V
The calculator first computes standard electromotive force from tabulated reduction potentials, then adjusts for non-standard conditions with the Nernst equation. This reflects concentration and temperature influence on cell voltage.
E°cell = E°cathode - E°anodeEcell = E°cell - (RT / nF) ln(Q)Constants used: R = 8.314 J/(mol K), F = 96485 C/mol, T in Kelvin.
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