Reaction Rate & Kinetics Calculator

How the rate depends on concentration, which picks the integrated rate law used.

• Zero order: rate is constant, independent of [A].
• First order: rate proportional to [A].
• Second order: rate proportional to [A]².

The rate constant of the reaction. A larger k means a faster reaction.

Its units depend on the order (s⁻¹ for first order).

Concentration of the reactant at time zero, in mol/L.

The tool reports how much is left after the time below.

How long the reaction has run, in seconds. The concentration left is computed at this time.

The energy barrier a collision must clear to react, in kJ/mol. A higher barrier means a slower reaction.

Typical reactions sit around 50–100 kJ/mol.

Absolute temperature in kelvin. Raising it increases the fraction of energetic collisions and speeds the reaction sharply.

Room temperature is about 298 K.

The Arrhenius frequency factor — roughly how often correctly-oriented collisions happen.

Often around 1e13 per second for simple gas reactions.