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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.
A ton in air conditioning is a reference to the heat capacity of a ton of melting water ice, over the period of one day. It is defined as 12000 BTU/hr, or 3517 watts. So for 1.5 tons, this will turn out to be 18000 BTU/hr or 5275.5 watts. And for 1 tons, as mentioned above; 12000 BTU/hr or 3517 watts.