Enter the energy value and choose the conversion direction to convert between kilojoules per mole (kJ/mol) and kilocalories per mole (kcal/mol).
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kJ/mol to kcal/mol Formula
The following formulas are used to convert between kilojoules per mole and kilocalories per mole.
kcal/mol = kJ/mol / 4.184
kJ/mol = kcal/mol * 4.184
Variables:
- kJ/mol is kilojoules per mole
- kcal/mol is kilocalories per mole
- 4.184 is the conversion factor between kilocalories and kilojoules
To convert kJ/mol to kcal/mol, divide by 4.184. To convert kcal/mol to kJ/mol, multiply by 4.184.
What is kJ/mol to kcal/mol?
kJ/mol and kcal/mol are both units of energy per mole commonly used in chemistry, thermodynamics, and physical science. The joule is the SI unit of energy, while the calorie and kilocalorie are traditional thermal energy units. Since 1 kilocalorie equals 4.184 kilojoules, the same energy value will be numerically smaller when expressed in kcal/mol than when expressed in kJ/mol.
This conversion is useful when working with activation energies, bond energies, enthalpy values, and reference tables that may use different unit systems.
How to Convert kJ/mol to kcal/mol?
The following steps outline how to convert between kJ/mol and kcal/mol.
- First, determine the energy value you want to convert.
- Next, identify whether the starting unit is kJ/mol or kcal/mol.
- If converting from kJ/mol to kcal/mol, divide the value by 4.184.
- If converting from kcal/mol to kJ/mol, multiply the value by 4.184.
- Finally, verify your answer using the calculator above.
Example Problem:
Use the following example values to test your knowledge.
Energy = 50 kJ/mol
Converted Energy = 50 / 4.184 = 11.95 kcal/mol
Reverse Example = 10 kcal/mol × 4.184 = 41.84 kJ/mol
kJ/mol to kcal/mol Conversion Table
The table below lists example conversions from kJ/mol to kcal/mol using the relationship kcal/mol = kJ/mol / 4.184.
| Energy (kJ/mol) | Conversion | Result (kcal/mol) |
|---|---|---|
| 1 kJ/mol | 1 / 4.184 | 0.24 kcal/mol |
| 5 kJ/mol | 5 / 4.184 | 1.20 kcal/mol |
| 10 kJ/mol | 10 / 4.184 | 2.39 kcal/mol |
| 25 kJ/mol | 25 / 4.184 | 5.98 kcal/mol |
| 50 kJ/mol | 50 / 4.184 | 11.95 kcal/mol |
| 100 kJ/mol | 100 / 4.184 | 23.90 kcal/mol |
| 250 kJ/mol | 250 / 4.184 | 59.75 kcal/mol |
In chemistry and thermodynamics, values may be reported in either kJ/mol or kcal/mol depending on the source. Knowing the fixed factor of 4.184 makes it easy to move between textbooks, databases, and software that use different energy units.