Definitions of speed of light, reduced Planck's constant, and electronvolt in terms of kilograms, meters, seconds:

Then solve for second:

Solve for kilogram:

Solve for meter:

Summarize results:

Dimensional conversion:

Now omit c and ℏ:

Dimensional conversion:


Based on: http://www.physics.gla.ac.uk/~dmiller/lectures/RQM_2008.pdf, page 12