# Map size

- <<Back to the Openttd.cfg (OpenTTD configuration file)

**map_x** and **map_y** are two variables of Openttd.cfg file:

The **Map size** determines the size and shape of your map. Your map must be a rectangle with sides of lengths in powers of 2, up to a limit of 4096 tiles in each direction. OpenTTD allows you to select the Map size in the map generation window. A large map gives you more space to spread out, but a smaller map will take less memory. Therefore, newer and faster computers will be able to handle a larger map with more efficiency whereas a smaller map will be best suited to older computers.

### Technical Specifications

**map_x** and **map_y** determine the size of the map. Each of these is calculated using the following arithmetic:

**2 ^ map_x = number of tiles x**,

**2 ^ map_y = number of tiles y**,

**tiles x * tiles y = total mapsize**

The ^ symbol means 'to the power of', so 2 to the power of map_x and map_y.

For example: Map_x = 10 = 1024 tiles on the x-axis, map_x = 9 = 512 tiles on the x-axis.

Minimum value is 6, maximum is 12 for both. This will give you maps with a minimum side length of 64 tiles (**map_x**=6) up to quite large 4096 tiles (**map_x**=12). The same holds true for **map_y**, so the map size ranges from 64 x 64 tiles over 64 x 4096 tiles (very elongated!) up to a square 4096 x 4096 tiles.