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

Reactant pressure (atm)

Partial pressure of the reactant side; must be greater than zero.

Product pressure (atm)

Partial pressure of the product side; must be greater than zero.

Reactant coefficient

Reactant stoichiometric coefficient.

Product coefficient

Product stoichiometric coefficient.

Compute the pressure-based equilibrium constant Kp = P_B^b / P_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]

Kp

Pressure-based equilibrium constant.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• 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.

• Kc From Concentrations Calculator

  Compute the concentration-based equilibrium constant Kc = [B]^b / [A]^a for a reversible reaction aA ⇌ bB.

• Equilibrium Qp Calculator

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

• Henry Constant From Solubility Calculator

  Derive Henry's law constant H = P / C from the partial pressure and dissolved gas concentration at equilibrium.