Type an inductance in any field. The value scales to henries via its prefix factor, then converts out to all other units live.
1 mH equals 1000 µH; each prefix step scales by a factor of 1000.
The henry (H) is the base; mH, µH and nH are 10⁻³, 10⁻⁶ and 10⁻⁹ H.
Nanohenries appear in high-frequency RF circuits where very small inductances matter.