There is no standard.
However, having said that, if you buy a map book or sheet, there are various scales which are generally used:
1:221,760 (1 inch = 3½ miles)
1:63,360 (1 inch = 1 mile - no longer issued by OS)
1:50,000 (2 cm = 1 km - the OS Landranger series, replacing the 1:63,360 series)
1:25,000 (4 cm = 1 km - the OS Pathfinder series)
The scale chosen depends upon the use.
The smaller the scale (the second number above) the more detail that can be put on the map.
The first example scale above is a map book for driving and generally shows major roads and some minor roads to allow for route planning.
The second/third examples can be used for driving, cycling or walking as they show roads, bridal ways, footpaths
The last example is good for walking as it shows more detail including field boundaries.
Maps with even smaller second numbers are used by specialist surveyors, eg to show property boundaries.
Atlases have a much larger second number.
The larger the second number, the less details that can be put (accurately) on the map.
There is no single standard. Road maps will have different scales to walking maps, for example.
There is no standard scale of a map. The scale used depends on what the map is used for. A motorist may use a 4 miles to 1 inch, a cyclist 1 mile to 1 inch (or 1:50 000), and a walker use 1:25 000 - and so on.
A large scale map.
if 2cm is 50km 1cm is 25km
It is drawn to full size
A map scale shows the ratio between the distances on the map and the distances in reality (one inch= 10 miles, for example) whereas the map legend tells what the various symbols on the map represent (landforms, size of roadway, state capitals, etc.)
Where does the series number on a map appear
A map scale of 1:175,000 means that 1 centimetre on the map represents 175,000 centimetres on the ground.
There is no standard scale of a map. The scale used depends on what the map is used for. A motorist may use a 4 miles to 1 inch, a cyclist 1 mile to 1 inch (or 1:50 000), and a walker use 1:25 000 - and so on.
This is a large-scale map. Maps with scales of 1:75,000 and larger are used for tactical, administrative, and logistical planning. These are the maps that a soldier is most likely to encounter. The standard large-scale map is 1:50,000; however, many areas have been mapped at a scale of 1:25,000.
I just call it a map. Scale is the size of the map relative to the reality. If you draw a map of your bedroom that is the same size as your bedroom, it has a scale of 1:1. I use a map of my town that is 1:100,000 (one centimetre equals one kilometre).
A large scale map.
large
The terms "small scale" and "large scale" are relative terms. Compared to a street map (typically 1:30000 or less) it is a large scale. Compared to a world map (1:10,000,000 or higher), it would be smaller. But because a 1:175000 does not show much detail (1 cm = 1.75 km), it would usually be considered a large scale map. It could be used for a metropolitan area highway map.
The scale doesn't tell you anything about the size of a map. If it's a 1:50000 scale, then the only thing you know about the map is that a pair of points that are 1 inch apart on the map are 50,000 inches apart in the real world.
Large
scale
the scale!