Thermal Capacity
cal/KtoJ/K
Convert calories per kelvin (cal/K) to joules per kelvin (J/K).
Factor1 cal/K = 4.184 J/K
Converter
cal/K
Accepts numbers or expressions, e.g. 150 + 14.7
Result
J/K
Rendered to 6 significant figures.
Formula
Formula
J/K = cal/K × 4.184
Multiply any value in calories per kelvin by 4.184 to obtain the value in joules per kelvin.
Worked example
Convert 1 cal/K to J/K.
- 01Start with 1 cal/K.
- 02Multiply by the conversion factor: 1 × 4.184 = 4.184 J/K.
Result1 cal/K = 4.184 J/K
Conversion table
| cal/K | J/K |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 200 | 836.8 |
| 500 | 2092 |
| 1000 | 4184 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cal/K to J/K?
1 cal/K equals 4.184 J/K. To convert, multiply the value in calories per kelvin by 4.184.
How do I convert 1 cal/K to J/K?
1 cal/K = 4.184 J/K. For any value, multiply by 4.184.
How do I convert J/K back to cal/K?
Divide by the same factor — or equivalently, multiply by 0.2390057. So 1 J/K = 0.239006 cal/K.
When would I need to convert calorie per kelvin to joule per kelvin?
Thermal-capacity conversions between cal/K and J/K appear in thermal-mass analysis of bodies, calorimetry, R-C thermal-network modelling, electronics thermal capacitance and large-equipment thermal-storage sizing. J/K and kJ/K are the SI standard; MJ/K and kWh/K cover large-equipment and building thermal-mass notation; BTU/°F is the US convention; cal/K and kcal/K are common in chemistry and thermochemistry. This category is lumped heat capacity only — it does NOT include specific heat capacity (J/(kg·K), requires mass), molar heat capacity (J/(mol·K), requires molecular weight) or volumetric heat capacity, all of which are different physical quantities.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).