About the Enthalpy Calculator
A free tool for finding reaction enthalpy via Hess's law.
What it is
This calculator sums the formation enthalpies of all reactants and products, weighted by their stoichiometric coefficients, and subtracts to find ฮHยฐrxn โ then classifies the reaction as exothermic or endothermic.
Features
Any number of species
Enter as many reactants and products as your equation needs.
Exo/endothermic label
Instantly see which way heat flows.
Step-by-step
See the Hess's law sum spelled out.
Instant, private
Runs entirely in your browser. No data is sent anywhere.