Energy unit converter

Conversion among meV, K, Ry, cm${}^{-1}$, nm, and THz.

Type in any field to update the rest.

meV K
Ry cm$^{-1}$
nm THz

Useful physical constants

$h = 6.62607015\times10^{-34}$ J$\cdot$Hz$^{-1} = 4.135667696\times10^{-15}$ eV$\cdot$Hz$^{-1}$

$\hbar = 1.054571817\times10^{-34}$ J$\cdot$s $= 6.582119569\times10^{-16}$ eV$\cdot$s

$hc = 1239.84198$ eV$\cdot$nm, $\quad \hbar c = 197.3269804$ eV$\cdot$nm

$k_B = 1.380649\times10^{-23}$ J$/$K $= 8.617333262\times10^{-5}$ eV$/$K

$N_A = 6.02214076\times10^{23}$ mol$^{-1}$