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You can either go for a 1 ton AC or a 1.5 ton AC depending upon the amount of light that enters the room, area and direction of windows, the floor on which your room is situated, number of people occupying the room and the number of lights.
The Btu for an AC usually ranges from 5,000 to 24,000, with 12,000 Btu being equivalent to one ton. Another rough measure is that a 100 sq ft area will need one ton of cooling capacity. However, as the ambient temperature in India is higher, you will need a slightly more powerful AC to cool the room.