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Thermal Capacity

Wh/KtoMJ/K

Convert watt-hours per kelvin (Wh/K) to megajoules per kelvin (MJ/K).

Factor1 Wh/K = 0.0036 MJ/K

Converter

Wh/K

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

Result
3.6MJ/K

Rendered to 6 significant figures.

Formula

Formula
MJ/K = Wh/K × 0.0036

Multiply any value in watt-hours per kelvin by 0.0036 to obtain the value in megajoules per kelvin.

Worked example

Convert 1000 Wh/K to MJ/K.

  1. 01Start with 1000 Wh/K.
  2. 02Multiply by the conversion factor: 1000 × 0.0036 = 3.6 MJ/K.
Result1000 Wh/K = 3.6 MJ/K

Conversion table

Wh/KMJ/K
10.0036
20.0072
50.018
100.036
200.072
500.18
1000.36
2000.72
5001.8
10003.6

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 0.0036 MJ/K. To convert, multiply the value in watt-hours per kelvin by 0.0036.
How do I convert 1 Wh/K to MJ/K?
1 Wh/K = 0.0036 MJ/K. For any value, multiply by 0.0036.
How do I convert MJ/K back to Wh/K?
Divide by the same factor — or equivalently, multiply by 277.7778. So 1 MJ/K = 277.778 Wh/K.
When would I need to convert watt-hour per kelvin to megajoule 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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