India, Sept. 8 -- You walk into a TV showroom, look at a massive 75-inch screen and think, "This is exactly what I want." Then you bring it home, sit on your sofa and suddenly realise the screen feels far too big for the room. The opposite can happen too: a 43-inch TV that looked perfectly fine in the store can feel surprisingly small once it is mounted on a large living room wall.

Picking the right smart TV size is not simply about getting the biggest screen your budget allows. The distance between your sofa and the TV, the amount of daylight entering the room, your gaming setup and even the sound system you plan to use can all change which screen size makes sense. Before you make the purchase, here are the things I would check to make ...