A good rule of thumb would be to measure the size of your TV diagonally. Once you’ve done that, add an extra margin of 10 cm all around, for the perfect TV unit size. Find a TV unit design that matches your viewing height or design one that is slightly below eye level. This will ensure that you don’t crane your neck or watch the television in an uncomfortable position. Here’s a basic guideline to help you - A 40-inch TV will work best with a TV unit size that is 110-140 cm in width A 50-inch TV will work best with a TV unit size that is 140-170 cm in width A 60-inch TV will work best with a TV unit size that is 170-200 cm in width