De Broglie Wavelength Calculator

Matter wavelength of a particle from its mass and velocity, with presets for electrons, protons and neutrons.

How to use the De Broglie Wavelength Calculator

Enter or select: Particle, Velocity.
Fill in what you know of: Custom mass — leave the unknown empty.
The results (Wavelength, Kinetic energy) are calculated instantly as you type.
Use “Copy link” to share the calculation with the same input values.

Formula

λ = h/p = h/(γmv)