Thermodynamics & Thermochemistry Calculators
All thermodynamics & thermochemistry calculators in one place.
Gibbs Free Energy Calculator
Solve ΔG = ΔH − TΔS for Gibbs free energy, enthalpy, entropy, or temperature, check reaction spontaneity and find the crossover temperature, or switch to Advanced Tools to convert between ΔG° and the equilibrium constant K, apply the reaction quotient Q for real conditions, and get the standard cell potential E°, with full step-by-step working and charts.
Enthalpy Change Calculator
Find the enthalpy change (ΔH) of a reaction from calorimetry data using q = mcΔT, check whether it's exothermic or endothermic, or switch to Advanced Tools to solve ΔH°rxn with Hess's Law from standard enthalpies of formation, with full step-by-step working and reaction diagrams.
Entropy Change Calculator
Find the entropy change (ΔS) from heating or cooling using ΔS = nCp ln(T2/T1), from a phase change using ΔS = ΔH/T, or switch to Advanced Tools to calculate standard reaction entropy from tabulated S° values, with full step-by-step working and disorder diagrams.
Specific Heat Capacity Calculator
Solve q = mcΔT for specific heat capacity, heat energy, mass, or temperature change in J/(g·°C) or cal/(g·°C), or switch to Advanced Tools to convert specific heat into molar heat capacity and compare common substances, with full step-by-step working and diagrams.
Heat of Fusion & Vaporization Solver
Solve q = nΔH for melting, boiling, or sublimation energy, moles, or molar enthalpy using built-in substance presets, or switch to Advanced Tools for a full multi-stage heating or cooling curve, with full step-by-step working and diagrams.
Hess's Law Enthalpy Solver
Combine known reactions with reverse and multiplier controls to solve for a target reaction's ΔH using classic Hess's Law problems, or switch to Standard Enthalpies of Formation mode with a built-in ΔHf° quick-fill library for 30+ common substances, with full step-by-step working and diagrams.
Bond Dissociation Enthalpy Calculator
Estimate a reaction's ΔH from average bond dissociation enthalpies using a bonds-broken vs bonds-formed builder with worked example reactions, or switch to a Bond Energy Lookup & Converter with 30+ common bonds and unit conversion between kJ/mol, kcal/mol, J, and eV, with full step-by-step working and diagrams.
Calorimetry Final Temperature Solver
Find the equilibrium temperature when two substances exchange heat using mA·cA·(Tf − TA) + mB·cB·(Tf − TB) = 0, or solve for an unknown specific heat, mass, or starting temperature, or switch to Advanced Tools to bring a calorimeter constant into the calculation, with full step-by-step working and diagrams.
Equilibrium Constant (Keq) from Gibbs Free Energy
Solve ΔG° = −RT ln K for the equilibrium constant K, the standard free energy ΔG°, or temperature, with instant spontaneity and reaction-extent interpretation, or switch to Advanced Tools to convert between Kp and Kc for gas-phase equilibria, with full step-by-step working and diagrams.
van 't Hoff Equation Solver
Solve the two-point van 't Hoff equation ln(K2/K1) = −(ΔH°/R)(1/T2 − 1/T1) for K2, K1, ΔH°, T1, or T2, with instant endothermic/exothermic interpretation, or switch to Advanced Tools to fit a full van 't Hoff plot (ΔH° and ΔS° from ln K vs 1/T) across any number of data points, with full step-by-step working and diagrams.
Lattice Energy & Born-Haber Cycle
Solve any step of the Born-Haber cycle (sublimation, ionization energy, bond dissociation, electron affinity, lattice energy, enthalpy of formation) with full working and a waterfall cycle diagram, or switch to the Born-Landé equation to predict lattice energy from ionic charge, radius, and the Madelung constant, with a theoretical-vs-experimental comparison chart.
Heat of Combustion Calculator
Find the molar and specific heat of combustion from bomb calorimetry data (Q = CΔT), or switch to Advanced Tools to calculate ΔH°comb for any CxHyOz fuel from standard enthalpies of formation via Hess's Law, with Higher vs Lower Heating Value and a fuel energy-density comparison chart, with full step-by-step working and diagrams.