∑ Swippe

Heat Density Converter

Convert heat density: J/m², BTU/ft², cal/cm².

5 units
6 decimals

1 J/m² = 0.000088 BTU/square foot

About the heat density converter

Convert heat density between J/m², kJ/m², cal/cm², BTU/ft², and the langley. Heat density (areal energy density) describes total energy delivered per unit area — used in solar radiation, laser exposure, and thermal-shock testing.

Frequently asked questions

  • What is a langley?

    One langley equals 1 cal/cm² = 41,840 J/m². It is used in solar irradiance and meteorology.

  • How many J/m² is 1 BTU/ft²?

    One BTU/ft² equals approximately 11,357 J/m².

  • How is heat density different from heat flux density?

    Heat density is total energy per area (J/m²). Heat flux density is energy per area per time (W/m²).

More heat converters

Fuel Efficiency — Mass → Fuel Efficiency — Volume → Temperature Interval → Thermal Expansion → Thermal Resistance → Thermal Conductivity → Specific Heat Capacity → Heat Flux Density →

Complete list of heat density units