›› Measurement unit: zeptometer

Full name: zeptometre

Plural form: zeptometers

Symbol: zm

Alternate spelling: zeptometres

Category type: length

Scale factor: 1.0E-21

›› SI unit: metre

The SI base unit for length is the metre.
1 metre is equal to 1.0E+21 zeptometer.

Valid units must be of the length type.
You can use this form to select from known units:

Convert zeptometer to

The SI prefix "zepto" represents a factor of 10^-21, or in exponential notation, 1E-21.

So 1 zeptometre = 10^-21 metre.