Just switch to metric units in *Properties Window > Scene > Units > Length*:

[![enter image description here][1]][1]

Or in versions 2.93 and above go to *Scene Properties > Units*

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/Zz1Jp.png
  [2]: https://i.sstatic.net/y7ohD.png