How to use the standard cell potential calculator
Find standard cell EMF from half-cell potentials. Enter cathode e°, anode e° in the fields above; the cell potential e°, spontaneous? are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- Ec — Cathode E° (V)
- Ea — Anode E° (V)
Worked example
With cathode e° = 0.34 V, anode e° = -0.76 V, the calculator gives cell potential e° ≈ 1.1 V; spontaneous? ≈ Yes.
Frequently asked questions
What is the formula for the standard cell potential calculation?
Cell potential E° (V) = Ec-Ea. Spontaneous? = [Cell potential E°]>0?"Yes":"No". Here Ec is cathode e° (V), Ea is anode e° (V).
What inputs do I need for the standard cell potential calculator?
You need cathode e° in V, anode e° in V. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.