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Thermal Capacity

Wh/KtomJ/K

Convert watt-hours per kelvin (Wh/K) to millijoules per kelvin (mJ/K).

Factor1 Wh/K = 3600000 mJ/K

Converter

Wh/K

Accepts numbers or expressions, e.g. 150 + 14.7

Result
3.60000e+6mJ/K

Rendered to 6 significant figures.

Formula

Formula
mJ/K = Wh/K × 3600000

Multiply any value in watt-hours per kelvin by 3600000 to obtain the value in millijoules per kelvin.

Worked example

Convert 1 Wh/K to mJ/K.

  1. 01Start with 1 Wh/K.
  2. 02Multiply by the conversion factor: 1 × 3600000 = 3.60000e+6 mJ/K.
Result1 Wh/K = 3.60000e+6 mJ/K

Conversion table

Wh/KmJ/K
13.6000e+6
27.2000e+6
51.8e+7
103.6e+7
207.2e+7
501.8e+8
1003.6e+8
2007.2e+8
5001.8e+9
10003.6e+9

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from Wh/K to mJ/K?
1 Wh/K equals 3600000 mJ/K. To convert, multiply the value in watt-hours per kelvin by 3600000.
How do I convert 1 Wh/K to mJ/K?
1 Wh/K = 3.60000e+6 mJ/K. For any value, multiply by 3600000.
How do I convert mJ/K back to Wh/K?
Divide by the same factor — or equivalently, multiply by 2.777778e-7. So 1 mJ/K = 2.77778e-7 Wh/K.
When would I need to convert watt-hour per kelvin to millijoule per kelvin?
Thermal-capacity conversions between Wh/K and mJ/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).

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