Convert joule/second/square metre to watt/square metre

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Joule/Second/Square Metre

The joule per second per square metre (J/(s·m²)) is dimensionally equivalent to the watt per square metre (W/m²), since 1 J/s = 1 W. It is used when emphasising the energy-flow interpretation of heat flux rather than the power interpretation, especially in educational and scientific contexts. 


Watt/Square Metre

The watt per square metre (W/m²) is the SI unit of heat flux density and irradiance. It represents the power transmitted per unit area. The solar constant (total solar irradiance) at Earth's orbit is approximately 1361 W/m². Used in heat transfer engineering, solar energy, and thermal radiation analysis. 


Joule/Second/Square Metre to Watt/Square Metre conversion table
Joule/Second/Square MetreWatt/Square MetreWatt/Square MetreJoule/Second/Square Metre
1111
2222
3333
5555
10101010
20202020
25252525
50505050
100100100100
250250250250
500500500500
1000100010001000
How to convert Joule/Second/Square Metre to Watt/Square Metre

1 J/(s·m²) = 1 W/m². To convert any value, multiply it by 1. For example, 25 J/(s·m²) = 25 W/m².

Frequently asked questions
How many W/m² are there in one J/(s·m²)?
One J/(s·m²) is equal to 1 W/m².
How do you convert Joule/Second/Square Metre to Watt/Square Metre?
Multiply the value in Joule/Second/Square Metre by 1 to get the result in Watt/Square Metre.
How much is 25 J/(s·m²) in W/m²?
25 J/(s·m²) is equal to 25 W/m².
How do you convert Watt/Square Metre back to Joule/Second/Square Metre?
Divide by the same factor: multiply the value in Watt/Square Metre by 1 to get Joule/Second/Square Metre.

Most common heat flux density unit conversions