Enter the total number of photons and the total wattage (watts) into the Calculator. The calculator will evaluate the Photons Per Watt. 

Photons Per Watt Formula

PPW = P / W


  • PPW is the Photons Per Watt (photons/watt)
  • P is the total number of photons
  • W is the total wattage (watts)

To calculate Photons Per Watt, divide the number of photons by the total wattage.

How to Calculate Photons Per Watt?

The following steps outline how to calculate the Photons Per Watt.

  1. First, determine the total number of photons. 
  2. Next, determine the total wattage (watts). 
  3. Next, gather the formula from above = PPW = P / W.
  4. Finally, calculate the Photons Per Watt.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total number of photons = 1500

total wattage (watts) = 400