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Thermal Capacity

mJ/KtoWh/K

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

Factor1 mJ/K = 2.777778e-7 Wh/K

Converter

mJ/K

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

Result
0.277778Wh/K

Rendered to 6 significant figures.

Formula

Formula
Wh/K = mJ/K × 2.777778e-7

Multiply any value in millijoules per kelvin by 2.777778e-7 to obtain the value in watt-hours per kelvin.

Worked example

Convert 1.00000e+6 mJ/K to Wh/K.

  1. 01Start with 1.00000e+6 mJ/K.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 2.777778e-7 = 0.277778 Wh/K.
Result1.00000e+6 mJ/K = 0.277778 Wh/K

Conversion table

mJ/KWh/K
12.7778e-7
25.5556e-7
51.3889e-6
102.7778e-6
205.5556e-6
501.3889e-5
1002.7778e-5
2005.5556e-5
5000.00013889
10000.00027778

Reference values rounded to 5 significant figures for display.

FAQ

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