Cell EMF Calculator

Find a cell's standard EMF from electrode potentials.

Cell EMF (V) 1.1

Spontaneous? Yes

Formula: EMF = E°(cathode) − E°(anode)

Step-by-step with your numbers:

1. Values used:

2. Cathode potential = 0.34 V

3. Anode potential = -0.76 V

5. Cell EMF = Cathode potential - Anode potential = 0.34 - -0.76 = 1.1V

6. Spontaneous? = Yes

Did we solve your problem today?

Cell EMF is the voltage of an electrochemical cell from its electrode potentials.

The math behind it

EMF = reduction potential of cathode − reduction potential of anode. Positive means spontaneous.

Cu (0.34) − Zn (−0.76) → 1.10 V.

Positive EMF?

Indicates a spontaneous (galvanic) cell.