Hi Vijay

This is nowhere as easy as you may imagine. What area is your map going to cover?

Every one degree of latitude is 60 nautical miles, so every minute is 1 nautical mile. (1 nautical mile = 6076 feet, 1 statute mile = 5280 feet)

The problem is that one degree of Longitude varies depending on Latitude. For example it's 60 nautical miles at the equator and 0 at the poles.

You will need to know what type of map you're using i.e. Mercator projection.