Tile disk usage
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Average tile size is 633 B on tile - March 2011.
OSM does NOT pre-render every tile. Pre-rendering all tiles would use around 54 TB of storage. As the following table shows, the majority of tiles are never viewed. In fact just 1.79% are viewed. It works out this way because the majority of tiles are at zoom level 18 and actually the majority contain nothing of interest. By following an on-the-fly rendering approach we can avoid rendering these tiles unnecessarily. The tile view count column shows how many tiles have been produced on the OSM Tile server.
Tile server disk usage: 1272GB used. (6 Jan 2012). (z0 to z15: 252GB, z16 to z18: 1020GB). As of 9 June 2017: 1250 GB (z0-15: 460 GB, z16-19: 790 GB). For current disk usage see munin disk usage, which is a fraction of total filesystem size for corresponding directories. Note that disk usage is dynamic: you can get less than 1 TB or more than 2 TB, depending on your caching settings.
To calculate a number of tiles for an area and an approximate size for these, try Geofabrik Tile Calculator.
|Zoom||Tile view count||Maximum (4^zoom)||% viewed on tile (March 2011)||% stored on tile server (November 2015)|