Electromotive Force (EMF) & Cell Potential Calculator

Calculate standard galvanic cell potential (E°cell) from standard reduction potentials of cathode and anode half-reactions.

Input Parameters

Instant Real-time Calculation

Standard Reduction Potential Cathode (E°cathode in Volts)

Standard Reduction Potential Anode (E°anode in Volts)

Result Chemistry

Standard Cell Potential (E°cell)

-- Volts (V)

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Calculation Logic:

Calculates overall cell electromotive force. A positive E°cell indicates a thermodynamically spontaneous galvanic cell; a negative E°cell represents an electrolytic cell.

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Understanding Electromotive Force (EMF) & Cell Potential Calculator & Formula

Mathematical Formula: E°cell = E°cathode (reduction) - E°anode (oxidation)

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Standard Reduction Potentials at 25°C (SHE Reference)

Half-Reaction	E° (Volts)	Role in Daniell Cell (Zn-Cu)
F2 + 2e⁻ → 2F⁻	+2.87 V	Strongest known oxidizing agent
Cu²⁺ + 2e⁻ → Cu	+0.34 V	Cathode (Reduction half-cell)
2H⁺ + 2e⁻ → H2	0.00 V	Standard Hydrogen Electrode (SHE reference)
Zn²⁺ + 2e⁻ → Zn	-0.76 V	Anode (Oxidation half-cell)
Li⁺ + e⁻ → Li	-3.04 V	Strongest known reducing agent

How to Use the Electromotive Force (EMF) & Cell Potential Calculator

1 Look up standard reduction potential for the cathode half-cell (e.g. +0.34 V for Cu²⁺/Cu).
2 Look up standard reduction potential for the anode half-cell (e.g. -0.76 V for Zn²⁺/Zn).
3 Obtain standard cell potential E°cell (+1.10 V for classic Daniell cell).

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