De Broglie Wavelength Calculator

About this calculator

This calculator finds the de Broglie wavelength of a moving particle: λ = h/(m·v), where h is Planck's constant, m is the particle's mass, and v is its velocity. This wavelength expresses the wave-like nature that quantum mechanics assigns to all matter, not just light — the smaller and slower the particle, the more its wave nature becomes noticeable relative to its size.

Physics and chemistry students use it to work through quantum mechanics problems, while researchers in electron microscopy rely on the same relationship to determine the resolving power achievable at a given electron energy. Enter the particle's mass and velocity to get its de Broglie wavelength.