Convert joule/square metre to langley

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Joule/Square Metre

The joule per square metre (J/m²) is the SI unit of radiant exposure or heat density. It represents the total energy incident on or passing through a unit area. Used in solar radiation measurements, laser energy delivery, and thermal analysis to quantify energy flux integrated over time. 


Langley

The langley (Ly) is a unit of radiant energy per unit area, equal to one thermochemical calorie per square centimetre (41,840 J/m²). Named after Samuel Pierpont Langley, it was widely used in meteorology and solar radiation research throughout the 20th century to express insolation values. 


Joule/Square Metre to Langley conversion table
Joule/Square MetreLangleyLangleyJoule/Square Metre
12.39E-05141840
24.78E-05283680
37.17E-053125520
50.00011955209200
100.00023910418400
200.00047820836800
250.0005975251.046E+06
500.00119503502.092E+06
1000.002390061004.184E+06
2500.005975142501.046E+07
5000.01195035002.092E+07
10000.023900610004.184E+07
How to convert Joule/Square Metre to Langley

1 J/m² = 2.39E-05 Ly. To convert any value, multiply it by 2.39E-05. For example, 25 J/m² = 0.0005975 Ly.

Frequently asked questions
How many Ly are there in one J/m²?
One J/m² is equal to 2.39E-05 Ly.
How do you convert Joule/Square Metre to Langley?
Multiply the value in Joule/Square Metre by 2.39E-05 to get the result in Langley.
How much is 25 J/m² in Ly?
25 J/m² is equal to 0.0005975 Ly.
How do you convert Langley back to Joule/Square Metre?
Divide by the same factor: multiply the value in Langley by 41840 to get Joule/Square Metre.

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