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An enthalpy calculator (or specific enthalpy calculator) helps you calculate enthalpy and change in enthalpy. Use this free calculate enthalpy calculator to compute enthalpy of reaction, delta h, and enthalpy of formation. This enthalpy calculator supports specific enthalpy formula calculations, reaction enthalpy calculator functionality, and delta h calculator for chemistry and thermodynamics.
Last updated: February 2, 2026
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Choose the type of heat transfer process
Mass of the substance in kilograms
Specific heat capacity of the substance (water: ~4186 J/(kg·K))
Change in temperature (positive for heating, negative for cooling)
Enthalpy Change (ΔH):
418600 J
Heat absorbed (endothermic)
Heat Transferred (Q):
418600 J
Total energy transfer
Energy in Kilojoules:
418.60 kJ
ΔH in kJ (1 kJ = 1000 J)
Calculation Steps:
Formulas Used:
Enthalpy Concepts:
Formula
ΔH = Q_p
Heat absorbed or released at constant pressure
Formula
Q = mcΔT
Heat for temperature change (measurable)
Formula
Q = mL
Heat for melting, freezing, boiling, condensing
Unit
J/(kg·K)
Energy to raise 1 kg by 1 K
Combined
Q_total = Q₁ + Q₂
Sensible + latent heat combined
Applications
Chemistry & Physics
Complete thermodynamic analysis tools
Heating 2 kg of water by 50°C (specific heat = 4186 J/(kg·K))
Enthalpy Change
418,600 J
2 × 4186 × 50
In Kilojoules
418.6 kJ
Endothermic (absorbs heat)
A specific enthalpy calculator computes specific enthalpy (h = H/m), which is enthalpy per unit mass. The specific enthalpy formula is h = H/m where H is total enthalpy and m is mass (units: J/kg or kJ/kg). To calculate enthalpy using an enthalpy calculator: for sensible heat use Q = mcΔT, for latent heat use Q = mL, for reactions use ΔH_rxn = ΣΔH_products - ΣΔH_reactants. This calculate enthalpy calculator automates these calculations. Also known as calculator enthalpy or enthalpy calc.
An enthalpy of reaction calculator (or reaction enthalpy calculator) calculates ΔH_rxn for chemical reactions using standard enthalpies of formation: ΔH_rxn = ΣnΔH°_f(products) - ΣmΔH°_f(reactants). A delta h calculator calculates ΔH (delta H), which represents enthalpy change. This delta h calculator computes ΔH for reactions (ΔH_rxn), formation (ΔH_f), vaporization (ΔH_vap), and temperature changes. Also known as delta h rxn calculator or hrxn calculator.
A change in enthalpy calculator (or change in heat calculator) calculates ΔH = H_final - H_initial. For constant pressure processes, ΔH = Q_p. An enthalpy of formation calculator (or heat of formation calculator) calculates ΔH°_f, the standard enthalpy change when one mole of a compound forms from its elements. This change in enthalpy calculator determines whether processes absorb or release energy. Also supports standard enthalpy calculator and enthalpy of water calculator.
Our enthalpy calculator computes heat transfer and enthalpy changes for various thermodynamic processes. The calculator uses fundamental thermodynamic equations to calculate sensible heat (temperature changes), latent heat (phase changes), and combined processes.
Sensible Heat (Temperature Change):
Q = mcΔTm = mass (kg), c = specific heat (J/(kg·K)), ΔT = temperature change (K)
Latent Heat (Phase Change):
Q = mLm = mass (kg), L = latent heat of fusion or vaporization (J/kg)
Combined Process:
Q_total = mcΔT + mLSum of sensible and latent heat contributions
Enthalpy Change at Constant Pressure:
ΔH = Q_pAt constant pressure, enthalpy change equals heat transferred
Enthalpy is a state function, meaning ΔH depends only on initial and final states, not the path taken. For endothermic processes (ΔH > 0), the system absorbs heat. For exothermic processes (ΔH < 0), the system releases heat to surroundings.
Shows energy changes in heating, phase transitions, and cooling
Enthalpy (H) is defined as H = U + PV, where U is internal energy, P is pressure, and V is volume. At constant pressure (most common condition), the enthalpy change equals the heat transferred: ΔH = Q_p. This makes enthalpy particularly useful for analyzing chemical reactions, phase transitions, and heating/cooling processes in open systems.
Need help with other chemistry calculations? Check out our ideal gas law calculator and mole calculator.
Get Custom Calculator for Your PlatformResult: ΔH = 251,160 J = 251.16 kJ
Energy required to heat 1 kg of water by 60°C. This is endothermic (absorbs heat).
1 kg ice at 0°C → water at 0°C
Q = 1 × 334,000 = 334 kJ (heat of fusion)
Ice (-10°C) → Steam (110°C)
Requires sensible + latent heat (multiple steps)
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