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Chemistry

Nernst Equation Calculator

Estimate cell potential from standard potential, reaction quotient, temperature and electrons transferred.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

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Your chemistry result

Your result

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Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter standard cell potential, temperature, electrons transferred, dimensionless reaction quotient q.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

E = E° − (RT/nF) ln(Q), using R = 8.31446261815324 J/(mol·K) and F ≈ 96485.33212331 C/mol.

A WORKED EXAMPLE

Using standard cell potential = 1.1 V, temperature = 298.15 K, electrons transferred = 2, dimensionless reaction quotient q = 10, the result is 1.07042033 V. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

The logarithm is zero, so the cell potential equals the entered standard potential at that temperature.

What to keep in mind

Use activities in dimensionless Q, omit pure solids and pure liquids, and use a balanced redox reaction. Not an operating-battery voltage prediction. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

What happens when Q is one?

The logarithm is zero, so the cell potential equals the entered standard potential at that temperature.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.