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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.
One of the first things I do is to apply my rule of thumb. Understand here that the standard practice among HVAC contractors sizing air conditioners for new homes is to use a rule of thumb. It's often in the neighborhood of 1 ton of air conditioning capacity for each 600 square feet of conditioned floor area, usually abbreviated 600 sf/ton. So, when I get a Manual J, I find the capacity and the conditioned floor area and calculate that number. I find out what the square feet per ton is for the house. If this is supposed to be an ENERGY STAR home, it shouldn't be 600 sf/ton. It should be more like 1000 sf/ton or higher. That's my rule of thumb.