De Broglie Wavelength Calculator
Matter wavelength from mass and velocity.
Enter your values
electron = 9.109e-31
ⓘ Live results
Results
- Wavelength λ
- 3.3065e-10 m
- In nanometres
- 0.330646 nm
- In ångströms
- 3.30646 Å
- Momentum
- 2.0040e-24 kg·m/s
Quick answer
The de Broglie wavelength is λ = h ÷ (mv): Planck's constant divided by momentum, giving the wave nature of any moving particle.
λ = h ÷ (m × v)
How to use the De Broglie Wavelength Calculator
- 1Enter the particle mass in kilograms (scientific notation is fine).
- 2Enter its velocity in m/s.
- 3Read λ in metres, nanometres or ångströms.
Inputs explained
- Mass(kg)
- electron = 9.109e-31
Worked example
Using the values the calculator loads with:
Inputs
- Mass9.109e-31 kg
- Velocity2.2e6 m/s
Results
- Wavelength λ3.3065e-10 m
- In nanometres0.330646 nm
- In ångströms3.30646 Å
- Momentum2.0040e-24 kg·m/s
Frequently asked questions
Why don't everyday objects show wave behaviour?
Their momentum is huge, so λ is around 10⁻³⁴ m — far too small to ever observe.
What is Planck's constant?
6.62607015 × 10⁻³⁴ J·s, the fixed constant that links a particle's energy to its wave frequency.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.