Answer: It is non-SI multiple of the inductance unit henry.
Answer: It is 1.00E-21 times henry.
Symbol : zH
So 1 zeptohenry = 1.00E-21 henry.
Example : 25 zeptohenry = 1.00E-21 x 25 henries.
Or we can say, 25zH = 2.5E-20 H.
Using this conversion chart compare one zeptohenry with other inductance units.
| 0.001 attohenry | 1.0E-19 centihenry |
| 1.0E-22 decahenry | 1.0E-20 decihenry |
| 1.0E-39 exahenry | 1.0E-6 femtohenry |
| 1.0E-30 gigahenry | 1.0E-23 hectohenry |
| 1.0E-21 henry | 1.0E-24 kilohenry |
| 1.0E-27 megahenry | 1.0E-15 microhenry |
| 1.0E-18 millihenry | 1.0E-12 nanohenry |
| 1.0E-36 petahenry | 1.0E-9 picohenry |
| 1.0E-33 terahenry | 1000 yoctohenry |
| 1.0E-45 yottahenry | 1 zeptohenry |
| 1.0E-42 zettahenry |