Size of Geohash grids

[raksha-agarwal]

What is the size of geohash grids corresponding to different precision levels? In meters??

[itamar-otonomo]

This depends on your location on the globe.
Same precision geohash in a specific latitude would have different dimensions than a geohash with the same precision on a different latitude.
I'd suggest you do some measurements using something like pyproj on the bboxes of geohashes with different precisions and different latitudes to get a general idea.