Unit converter
Heat Density converter
Convert heat density units expressed as energy per unit area.
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1 J/m² = 0.0000239006 Ly
All Heat Density units
From 1 J/m²| Unit | Value |
|---|---|
| Joule/square meter J/m² | 1 |
| Langley Ly | 0.0000239006 |
| Btu (IT)/square foot Btu/ft² | 0.0000880551 |
| Calorie (IT)/square centimeter cal/cm² | 0.0000239006 |
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Reference
How heat density conversion works
Heat density describes thermal energy distributed over an area. Values are normalized to Joule/square meter before conversion to the requested output unit.
Values are converted to joule/square meter first, then from that reference into the requested unit. Keeping a single documented reference reduces inconsistent pair-by-pair constants.
Unit reference
| Unit | Symbol | 1 unit in J/m² |
|---|---|---|
| Joule/square meter | J/m² | 1 |
| Langley | Ly | 41,840 |
| Btu (IT)/square foot | Btu/ft² | 11,356.526680000001 |
| Calorie (IT)/square centimeter | cal/cm² | 41,840 |
Long-tail directory
Every indexed conversion
Choose a source unit to see all available destinations.
From Joule/square meter (J/m²)
From Langley (Ly)
From Btu (IT)/square foot (Btu/ft²)
From Calorie (IT)/square centimeter (cal/cm²)
Primary source
Definitions and standards
The SI framework is checked against NIST Guide for the Use of the International System of Units. Conventional factors are retained from the extended ConvertWin inventory and carry the accuracy note shown above.
See Methods & sources for rounding rules, exact-value handling, and review policy.
Questions
Heat Density FAQ
What is the reference unit for heat density conversions?
ConvertWin uses joule/square meter (J/m²) as the internal reference for this category, then converts to the selected output unit.
How accurate is this heat density converter?
SI relationships follow the cited reference. Conventional and domain-specific factors use the established ConvertWin factor inventory; verify safety-critical work against the governing standard.