Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Reactant concentration (mol/L)

Equilibrium reactant concentration; must be greater than zero.

Product concentration (mol/L)

Equilibrium product concentration; must be greater than zero.

Reactant coefficient

Reactant stoichiometric coefficient.

Product coefficient

Product stoichiometric coefficient.

Compute the concentration-based equilibrium constant Kc = [B]^b / [A]^a for a reversible reaction aA ⇌ bB. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Kc

Concentration-based equilibrium constant.

• Concentration conversions require an unambiguous amount basis, solution volume, density, purity, and temperature. Volumes may not be additive, and molarity, molality, formality, equivalents, and mass fraction are not interchangeable.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Kp From Partial Pressures Calculator

  Compute the pressure-based equilibrium constant Kp = P_B^b / P_A^a for a reversible reaction aA ⇌ bB.

• Kc From Equilibrium Conc

  Compute the equilibrium constant Kc as equilibrium product concentration to power p over reactant concentration to power r.

• Equilibrium Qp Calculator

  Compute the reaction quotient in terms of partial pressures as Qp = P_B^b / P_A^a for aA ⇌ bB.