That s 50 75 away from a 50 tv which is about 1 3 1 9m away.
Ideal tv size for room size.
4k uhd tvs double that to 64 degrees.
This means 60 pixels per degree or 32 degrees for a 1080p television.
If you d rather skip the complicated calculations you can simply multiply the seating distance in inches by 0 625.
With 4k tvs this is lowered to 1 1 5 times the screen diagonal.
Because of the increased resolution the recommended ideal viewing distance is between one and 1 5 times the screen size.
Studies show that someone with 20 20 vision or 6 6 in europe can distinguish something 1 60 of a degree apart.
Here is a rough guideline from crutchfield on tv sizes and sitting distances for high definition hd tvs.
So for a 50 tv that s at least 75 125 inches away about 1 9 3 2m.
The smallest 4k tvs generally you wont find a 4k tv smaller than 40 inches and the vast majority are 43 inch.
The lg 43um7600plb for example has a 43 inch display while the lg oled55c9plahas a 65 inch one.