Gibbs Energy and Equilibrium Constant Calculator
Calculate standard Gibbs energy and dimensionless equilibrium constant from entered standard enthalpy, entropy and temperature.
YOUR CALCULATION
Result
—
Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Convert kJ enthalpy to joules, preserve the entropy sign and apply the dimensionless standard-state equilibrium relation.
ΔG°=ΔH°−TΔS°; ln K=−ΔG°/(RT)
Worked example
ΔH°=−10 kJ/mol, ΔS°=−20 J/(mol K) and 298.15 K give ΔG°=−4.037 kJ/mol.
Assumptions and input details
Thermodynamic standard-state K with the entered reaction scaling. ΔH° and ΔS° are treated as temperature-independent. No activities, nonstandard reaction quotient, phase transition or real reaction-rate prediction. Extreme K is described by its logarithm.
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
Calculate a cell potential from standard potential, temperature, electron count and the logarithm of the reaction quotient.
Balance a neutral chemical equation using exact element conservation. Return the smallest positive integer coefficients and an atom-count check for every element.
Solve ideal concentration equilibrium for the fixed stoichiometry A+B ⇌ C+D with nonnegative species balances.
Reserved advertising space.