Converter category
Heat Density Converter
Convert between J/m², kJ/m², BTU/ft², cal/cm² and other heat density units.
Universal Heat Density Converter
About heat density conversions
Heat density conversions are used in HVAC, solar energy, combustion engineering, and thermal analysis. Our heat density converter covers joules per square meter, kilojoules per square meter, calories per square centimeter, and BTU per square foot. Heat density measures total energy per unit area. Whether you are sizing heating panels, analyzing solar collectors, or specifying industrial burners, this converter provides accurate conversions.
Most popular heat density conversions
Available units
Popular heat density conversions (30 total)
Unit definitions
Joule per Square Meter (J/m²)
SI unit of heat density (energy per area).
Origin: Thermodynamics.
Current use: Solar radiation, Heat transfer analysis
Kilojoule per Square Meter (kJ/m²)
1000 J/m².
Origin: Engineering heat density.
Current use: Solar thermal, Building physics
Megajoule per Square Meter (MJ/m²)
10⁶ J/m².
Origin: Large-scale energy flux.
Current use: Concentrated solar, Industrial furnaces
Calorie per Square Centimeter (cal/cm²)
41840 J/m².
Origin: CGS thermodynamics.
Current use: Solar radiation, Calorimetry
Kilocalorie per Square Meter (kcal/m²)
4184 J/m².
Origin: European thermal engineering.
Current use: Solar energy, Building science
BTU per Square Foot (BTU/ft²)
11356.53 J/m².
Origin: US thermal engineering.
Current use: Solar energy, HVAC, US standards
Common uses for heat density conversions
Used for solar panels, radiant heating, combustion, and industrial heat release.
Frequently asked questions about heat density
How many BTU/ft² is 1 J/m²?+
1 J/m² equals approximately 0.000088 BTU/ft².
What is heat density?+
Heat density is the total energy per unit area, measured in J/m² or BTU/ft².
Which units are supported?+
J/m², kJ/m², MJ/m², cal/cm², kcal/m², and BTU/ft².