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Thermal Capacity

BTU/°FtoMJ/K

Convert British thermal units per degree Fahrenheit (BTU/°F) to megajoules per kelvin (MJ/K).

Factor1 BTU/°F = 0.001899101 MJ/K

Converter

BTU/°F

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

Result
1.8991MJ/K

Rendered to 6 significant figures.

Formula

Formula
MJ/K = BTU/°F × 0.001899101

Multiply any value in British thermal units per degree Fahrenheit by 0.001899101 to obtain the value in megajoules per kelvin.

Worked example

Convert 1000 BTU/°F to MJ/K.

  1. 01Start with 1000 BTU/°F.
  2. 02Multiply by the conversion factor: 1000 × 0.001899101 = 1.8991 MJ/K.
Result1000 BTU/°F = 1.8991 MJ/K

Conversion table

BTU/°FMJ/K
10.0018991
20.0037982
50.0094955
100.018991
200.037982
500.094955
1000.18991
2000.37982
5000.94955
10001.8991

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/°F to MJ/K?
1 BTU/°F equals 0.001899101 MJ/K. To convert, multiply the value in British thermal units per degree Fahrenheit by 0.001899101.
How do I convert 1 BTU/°F to MJ/K?
1 BTU/°F = 0.0018991 MJ/K. For any value, multiply by 0.001899101.
How do I convert MJ/K back to BTU/°F?
Divide by the same factor — or equivalently, multiply by 526.5651. So 1 MJ/K = 526.565 BTU/°F.
When would I need to convert British thermal unit per degree Fahrenheit to megajoule per kelvin?
Thermal-capacity conversions between BTU/°F 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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