What is the mass of a muon?
The muon mass is m_μ = 1.883531627e-28 kg (uncertainty ±4.2e-37), or 105.6583755 MeV/c^2 — about 207 times the electron mass.
Open the interactive PhysRef tool →Key facts
| Value | 1.883531627e-28 kg |
|---|---|
| Symbol | m_μ |
| Energy equivalent | 105.6583755 MeV/c^2 |
| Uncertainty | ±4.2e-37 kg |
| Source | CODATA 2018 / PDG |
Frequently asked questions
What is the mass of a muon?
m_μ = 1.883531627e-28 kg, or 105.6583755 MeV/c^2, roughly 207 times the electron mass.
What is the muon mass in MeV?
The muon rest mass is 105.6583755 MeV/c^2.
How does the muon compare to the electron?
The muon is a heavier cousin of the electron, about 206.77 times its mass, and is unstable.
Related pages
Muon mass is part of PhysRef on GOAT Lab — a free reference you can use without signing up, and it works offline. Open the tool above for any custom value.
Part of GOAT Lab — 26 free, browser-based science, engineering and developer tools. No sign-up.