Nernst equation calculator

Cell potential E from E°, n, T (K), and reaction quotient Q using E = E° − (RT/nF) ln Q.

Calculator

Model / formula

E = E° − (RT / nF) ln Q (base e; SI: R = 8.314 J/mol·K, F = 96 485 C/mol)

E° (V)

n (mol e⁻ per mol reaction as written)

T (K)

Reaction quotient Q

$$E = E^\circ - \frac{RT}{nF} \ln Q$$

When to use

Educational use only. Double-check values for labs, homework, and exams.