| Nominative | megahertz |
| Genitive | megahertzu |
| Dative | megahertzu |
| Accusative | megahertz |
| Vocative | megahertze |
| Locative | megahertzu |
| Instrumental | megahertzem |
| Nominative | megahertzy |
| Genitive | megahertzů |
| Dative | megahertzům |
| Accusative | megahertzy |
| Vocative | megahertzy |
| Locative | megahertzech; megahertzích |
| Instrumental | megahertzy |