It is non-SI multiple of the frequency unit hertz.
Symbol : fHz
So 1 femtohertz = 1.00E-15 hertz.
Example : 5 femtohertz = 1.00E-15 X 5 Hertz.
Or we can say, 5fHz = 5.0E-15 Hz.
Use this conversion chart to compare one femtohertz with other frequency measurement units.
| 1000 aHz | 1.0E-13 cHz |
| 1.0E-14 dHz | 1.0E-16 daHz |
| 1.0E-33 EHz | 1 fHz |
| 1.0E-24 GHz | 1.0E-15 Hz |
| 1.0E-18 kHz | 1.0E-21 MHz |
| 1.0E-9 µHz | 1.0E-12 mHz |
| 1.0E-6 nHz | 1.0E-30 PHz |
| 0.001 pHz | 1.0E-27 THz |
| 1000000000 yHz | 1.0E-39 YHz |
| 1000000 zHz | 1.0E-36 ZHz |