BTU/°FtoJ/K

1 BTU/°F equals 1899.101 J/K. To convert, multiply the value in British thermal units per degree Fahrenheit by 1899.101.

1 BTU/°F = 1899.1 J/K. For any value, multiply by 1899.101.

Divide by the same factor — or equivalently, multiply by 0.0005265651. So 1 J/K = 0.000526565 BTU/°F.

Thermal-capacity conversions between BTU/°F and J/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.

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).