Chemical Equilibrium Constant Calculator

Explore Kc and Kp for balanced chemical systems. See exponents, units, and reaction quotients clearly. Compare constants with temperature, gas moles, and energy instantly.

Calculation Mode

Temperature (K) (optional for Kc/Kp)

Used for ΔG° = −RT ln(K).

Products

Species 1

Coeff

Concentration

Species 2

Coeff

Concentration

Species 3

Coeff

Concentration

Species 4

Coeff

Concentration

Reactants

Species 1

Coeff

Concentration

Species 2

Coeff

Concentration

Species 3

Coeff

Concentration

Species 4

Coeff

Concentration

Only filled rows are used.

Formula Used

Kc = Π[products]^coeff / Π[reactants]^coeff
Kp = Π(pressures of products)^coeff / Π(pressures of reactants)^coeff
Conversion: Kp = Kc (RT)^Δn, where R = 0.082057 L·atm/(mol·K)
Thermo link: ΔG° = −RT ln(K), where R = 8.314 J/(mol·K)

K is treated as dimensionless for reporting.

How to Use This Calculator

Select a mode: Kc, Kp, or conversion.
Enter each species name, coefficient, and value.
Fill only the rows you actually need.
Optionally enter temperature to compute ΔG°.
Press Submit to show results above the form.
Use CSV or PDF buttons to save your output.

Example Data Table

Reaction (illustrative)	Type	Inputs (sample)	Output
CO + H2O ⇌ CO2 + H2	Kc	[CO2]=0.20, [H2]=0.10, [CO]=0.50, [H2O]=0.40	Kc = (0.20×0.10)/(0.50×0.40)=0.10
N2 + 3H2 ⇌ 2NH3	Kp	PNH3=1.0, PN2=2.0, PH2=3.0	Kp = (1.0^2)/(2.0×3.0^3)=0.0185
2SO2 + O2 ⇌ 2SO3	Convert	Kc=4.5, Δn=−1, T=700	Kp = Kc(RT)^Δn

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.