Nernst Equation Calculator
🔋 Rates & Electrochemistry. Use the Nernst equation formula to find cell potential, standard potential e°, temperature, electrons transferred z, reaction quotient q: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Cell potential | V |
| Standard potential E° | V |
| Temperature | K |
| Electrons transferred z | no unit |
| Reaction quotient Q | no unit |
Worked example
Find the cell potential when Standard potential E° = 1.1 V, Temperature = 298 K, Electrons transferred z = 2, Reaction quotient Q = 0.1.
Using E = E° - RT/zFln Q: Cell potential = 1.1296 V.
Frequently asked questions
What is the formula for Nernst equation?
E = E° - RT/zFln Q.
What do the letters stand for, and what units are used?
Cell potential in V, Standard potential E° in V, Temperature in K, Electrons transferred z, Reaction quotient Q.
How do you calculate cell potential?
Put the values into E = E° - RT/zFln Q. For example, with Standard potential E° = 1.1 V, Temperature = 298 K, Electrons transferred z = 2, Reaction quotient Q = 0.1, cell potential = 1.1296 V.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (cell potential, standard potential e°, temperature, electrons transferred z, reaction quotient q) and fill in the others: it rearranges the formula for you.
