Enter the wavelength into the calculator to determine the Energy from Wavelength. 

Energy from Wavelength Formula

The following equation is used to calculate the Energy from Wavelength.

E = h*c / λ
  • Where E is the Energy from Wavelength (Joules)
  • λ is the wavelength (m)
  • h is the Planck’s Constant (6.626176 x 10-34 joule-seconds.)
  • c is the speed of light (299 792 458 m/s)

To calculate energy from a wavelength, divide the product of Planck’s Constant and the speed of light by the wavelength.

What are the units for Energy from Wavelength?

The most common units for Energy from Wavelength are Joules.

How to Calculate Energy from Wavelength?

Example Problem:

The following example problem outlines the steps and information needed to calculate the Energy from Wavelength.

First, determine the wavelength. In this example, the wavelength is determined to be 150 (m).

Finally, calculate the Energy from Wavelength using the formula above: 

E = h*c / λ

Inserting the values from above and solving the equation with the imputed values gives: 

E = 299 792 458*6.626176 x 10^-34 / 150 = 1.3243184e-27 (Joules)