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Thermal Capacity

MJ/KtoWh/K

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

Factor1 MJ/K = 277.7778 Wh/K

Converter

MJ/K

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

Result
277.778Wh/K

Rendered to 6 significant figures.

Formula

Formula
Wh/K = MJ/K × 277.7778

Multiply any value in megajoules per kelvin by 277.7778 to obtain the value in watt-hours per kelvin.

Worked example

Convert 1 MJ/K to Wh/K.

  1. 01Start with 1 MJ/K.
  2. 02Multiply by the conversion factor: 1 × 277.7778 = 277.778 Wh/K.
Result1 MJ/K = 277.778 Wh/K

Conversion table

MJ/KWh/K
1277.78
2555.56
51388.9
102777.8
205555.6
5013889
10027778
20055556
5001.3889e+5
10002.7778e+5

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