Enthalpy Calculator

About the Enthalpy Calculator

The Enthalpy Calculator allows you to quickly compute the relationship between heat transfer (Q), work done (W), and enthalpy change (ΔH) in thermodynamic processes. Simply enter any two known values, and the calculator automatically determines the remaining parameter using ΔH = Q + W. This tool is ideal for students, researchers, and engineers working on energy and thermodynamics problems.

What You Can Calculate

• Heat Transfer (Q): The thermal energy added or removed from a system, measured in Joules (J) or kilojoules (kJ).
• Work Done (W): The work performed on or by the system, measured in Joules (J) or kilojoules (kJ).
• Enthalpy Change (ΔH): The total energy change in the system, measured in Joules (J) or kilojoules (kJ).

Formulas Used in the Calculator

The calculator applies the fundamental relation for enthalpy changes:

• ΔH = Q + W   (Enthalpy change = Heat transfer + Work done)
• Q = ΔH − W   (Heat transfer calculated from enthalpy change and work)
• W = ΔH − Q   (Work calculated from enthalpy change and heat transfer)

These formulas allow accurate calculation of energy changes with unit conversions between Joules (J) and kilojoules (kJ).

How to Use the Calculator

1. Enter any two known quantities — for example, heat transfer and work done.
2. Select the appropriate units for each value (J/kJ).
3. The calculator will automatically compute the missing value using the enthalpy relation.
4. Adjust inputs as needed to analyze different thermodynamic scenarios and energy transfers.

Applications of Enthalpy Calculations

• Calculate enthalpy changes in reversible and irreversible thermodynamic processes.
• Analyze energy transfer in heating, cooling, and work interactions.
• Study energy efficiency and system performance in engines, turbines, and refrigeration systems.