A kio is a unit of length in the Matoran Universe. It is equal to one thousand bio. It is roughly equal to 0.85 miles or 1.37 kilometers. There are 1000 kio in a mio
- Metru Nui is 47.6 kio long and 24 kio wide
- Mata Nui is 357 kio long and 178 kio wide