How far to sit from your 4K TV, at every possible size, is the TV viewing distance size chart.
You need the picture to fill up your entire field of vision for the best viewing experience.This isn't the typical viewing area from your eyes, but rather how much you can see while sitting down.You would need the largest TV screen possible that would meet your room size, budget, mounting hardware/stand and viewing distance in order to get the most immersive experience.
If your budget allows, buying the largest possible TV that works with your room size is the best solution.If the TV is too big for your room, you're at risk of straining your eyes, while an undersized TV doesn't give you all the details of displaying the picture, this is a two condition verse.
Measure the distance from the sofa to where the TV will be mounted.You will have a good idea of which TV size will give you the best viewing area.
For 4K Ultra HD, the viewing distance is only 1 to 1.5 times of the screen size.There are different viewing distances for the different resolution.The table below shows the optimal viewing distances for a general TV screen size.
The table above has a range of distance for screen size.If your budget allows, the smaller bound number is the optimal distance if your room is large.
Depending on your situation, a test viewing may be required.
As you can see from the chart above, higher picture resolution requires shorter viewing distances to keep your eyes healthy.The viewing area is short for the newer 8k TV because it's too close to the screen.Most people complain about skipping the hype of getting 8k TV.If you don't have a lot of money, an 8k is a nice treat for any movie session.
It is fine to sit farther away if you are only getting a small TV as a temporal solution.It's a little wasteful of the high depth picture, but it doesn't put constrain on anything.
There are other factors that can affect your viewing pleasure.Consider the angle at which your TV will be when wall-mounting it.This is dependent on the type of chair or sofa you are sitting on.Since the recommended distance is measured from the front of the screen to just before your eyes level, this vertical angle will affect and increase as well.
A test view is the best way to determine if it is right or not.Try to place a large poster or picture frame in the same position as before.Hopefully, you will be able to pick the correct size for your TV viewing distance if you follow the guide above.It is possible to make the sitting area closer but not the other way around.