Enter the absolute temperature (K) and the Stefan’s Constant (5.67*10^-8 W/m^2/K^4) into the calculator to determine the Radiant Energy. 

Radiant Energy Formula

The following equation is used to calculate the Radiant Energy.

RE = σ * T^4

  • Where RE is the Radiant Energy (Joules)
  • T is the absolute temperature (K) 
  • σ is the Stefan’s Constant (5.67*10^-8 W/m^2/K^4) 

How to Calculate Radiant Energy?

The following example problems outline the steps and information needed to calculate the Radiant Energy.

Example Problem #1

  1. First, determine the absolute temperature (K). In this example, the absolute temperature (K) is determined to be 5 .
  2. Next, determine the Stefan’s Constant (5.67*10^-8 W/m^2/K^4)
  3. Finally, calculate the Radiant Energy using the formula above: 

RE = σ * T^4

Inserting the values from above and solving the equation yields: 

RE = 5.67*10^-8 * 5^4 = .0000354 (Joules)


Example Problem #2

Using the same method as above, first, we need to measure or determine the variables required by the equation. For this example problem, these are provided as follows: 

absolute temperature (K) = 6

Stefan’s Constant (5.67*10^-8 W/m^2/K^4)

Enter these given values into the calculator or above yields: RE = σ * T^4 = .0000734 (Joules)