1. Convert to base units
J/kg = input value x input unit factor
Every supported specific enthalpy unit is stored as a factor relative to joules per kilogram.
Thermodynamics unit converter
Enthalpy Unit Converter
Convert specific enthalpy units for thermodynamics, HVAC, steam tables, refrigeration, energy balances, and heat transfer calculations.
Live enthalpy conversion
Convert specific enthalpy units
Enter a value, choose the starting unit, and select a target unit. The full enthalpy conversion table updates automatically.
Converted value
All units
Enthalpy conversion table
Compare the entered value across SI, imperial, thermal, and HVAC-specific enthalpy units.
Common conversions
Useful enthalpy conversion factors
| Conversion | Factor | Typical use |
|---|---|---|
| kJ/kg to BTU/lb | BTU/lb = kJ/kg x 0.429922614 | HVAC and steam table data |
| BTU/lb to kJ/kg | kJ/kg = BTU/lb x 2.326 | Imperial to SI thermodynamics |
| MJ/kg to kJ/kg | kJ/kg = MJ/kg x 1000 | Fuel and energy content |
| cal/g to kJ/kg | kJ/kg = cal/g x 4.184 | Thermal property data |
| Wh/kg to kJ/kg | kJ/kg = Wh/kg x 3.6 | Battery and storage data |
| kcal/kg to kJ/kg | kJ/kg = kcal/kg x 4.184 | Heat and material data |
How it works
Enthalpy conversion method
2. Convert to target units
target value = base value / target unit factor
The selected result and table values are calculated from the same base value.
3. Check precision
rounding depends on scale
Very small and very large values use compact scientific notation to stay readable.
FAQ
Enthalpy converter questions
How do you convert kJ/kg to BTU/lb?
Multiply kJ/kg by about 0.429922614 to convert to BTU/lb.
How do you convert BTU/lb to kJ/kg?
Multiply BTU/lb by about 2.326 to convert to kJ/kg.
What is specific enthalpy?
Specific enthalpy is enthalpy per unit mass and is commonly used in thermodynamics, HVAC, and steam table calculations.
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