Joules per Square Meter to Langleys Converter
Enter the heat density in joules per square meter below to convert it to langleys.
Convert Joules per Square Meter to Langleys
Enter a value in joules per square meter (J/m²) to convert to langleys (Ly).
Joule per Square Meter to Langley Conversion Table
Table showing various joule per square meter measurements converted to langleys. Click any preset value or arrow to load it into the converter.
| Joules per Square Meter (J/m²) | Langleys (Ly) |
|---|---|
| 1 J/m² | 0.000023901 Ly |
| 2 J/m² | 0.000047801 Ly |
| 5 J/m² | 0.000119503 Ly |
| 10 J/m² | 0.000239006 Ly |
| 15 J/m² | 0.000358509 Ly |
| 20 J/m² | 0.000478011 Ly |
| 25 J/m² | 0.000597514 Ly |
| 30 J/m² | 0.000717017 Ly |
| 50 J/m² | 0.001195 Ly |
| 75 J/m² | 0.0017925 Ly |
How to Convert Joules per Square Meter to Langleys
To convert joules per square meter to langleys, multiply the heat density by the following conversion ratio: 0.000023901 langleys/joule per square meter.
Since one joule per square meter is equal to 0.000023901 langleys, you can use this simple formula to convert:
The heat density in langleys is equal to the heat density in joules per square meter multiplied by 0.000023901.
For example, here's how to convert 10 joules per square meter to langleys using the formula above.
How Many Langleys Are in a Joule per Square Meter?
There are 0.000023901 langleys in a joule per square meter, which is why we use this value in the formula above.
Our joule per square meter to langley calculator automatically converts your heat density measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Joules per Square Meter and langleys are both units used to measure heat density. Keep reading to learn more about each unit.
What Is a Joule per Square Meter?
SI unit of areal heat density and radiant exposure. It serves as a primary reference unit for measuring heat density across scientific and practical applications. [1]
The joule per square meter is classified as an International System of Units (SI) unit of heat density. Joules per Square Meter can be abbreviated as J/m²; for example, 1 joule per square meter can be written as 1 J/m².
As the primary coherent reference unit for heat density in this category, all other heat density units are mathematically anchored to the joule per square meter (J/m²).
In practice, joules per square meter (J/m²) are widely used across standard heat density applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Langley?
A langley is a unit of heat density equal to 41,840 joules per square meter (J/m²), the base unit for heat density. Solar insolation unit equal to 1 thermochemical calorie/cm² (41,840 J/m²). [2]
The langley is classified as a metric and SI-compatible unit of heat density. Langleys can be abbreviated as Ly; for example, 1 langley can be written as 1 Ly.
When working with langleys (Ly) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, langleys (Ly) are widely used across large-scale industrial, bulk, and macro-level heat density specifications within SI metric workflows, engineering documentation, and technical data sheets.
When converting heat density between joules per square meter (J/m²) and langleys (Ly), keep full floating-point precision (1 J/m² = 0.000023901 Ly; 1 Ly = 41,840 J/m²) during intermediate calculations and round only the final langley figure to match your instrument tolerance.
More Joule per Square Meter & Langley Conversions
Need to calculate in the opposite direction? Use our langleys to joules per square meter converter (Ly to J/m²) to switch your starting unit immediately. You can also explore related tools such as converting joules per square meter to kilojoules per square meter, converting joules per square meter to megajoules per square meter, or converting kilojoules per square meter to joules per square meter.
Convert from Joules per Square Meter
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Heat Density Metrology Standard — Joules per Square Meter (J/m²) to Langleys (Ly)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Joule per Square Meter (J/m²) & Langley (cal/cm²) (Ly)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (J/m² to Ly)