How do I calculate the right TV size?

For 4K TVs, the recommended viewing distance is 1 to 1.5 times the screen diagonal. For example, for a 65-inch TV, you should sit between 5.4 and 8.1 feet away. For 1080p TVs, the distance should be 1.5 to 2.5 times the screen size.

Can a TV be too big for a room?

Yes. If you sit too close to a very large screen, you may see individual pixels (especially with 1080p), and you might suffer from eye strain or motion sickness because your eyes have to constantly dart around to see the whole image.

How high should I mount my TV?

The center of the TV screen should be at eye level when you are seated. This is typically about 42 inches from the floor to the center of the TV. Mounting it too high (like above a fireplace) can cause neck pain.

What is the 40-degree viewing angle rule?

THX recommends a viewing angle of 40 degrees or more for an immersive cinematic experience. To achieve this, divide your viewing distance (in inches) by 1.2 to get the recommended screen diagonal.

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TV Size Calculator

Find the recommended TV diagonal size (in inches) based on your viewing distance.

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How to Choose the Right TV Size

Buying a new TV is exciting, but size matters. The goal is to fill enough of your field of view to create an immersive experience without causing eye strain.

Resolution Matters

4K Ultra HD: You can sit closer to a 4K TV because the pixels are smaller. Recommended distance is 1 to 1.5 times the screen size.
1080p Full HD: You need to sit further back to avoid seeing pixels. Recommended distance is 1.5 to 2.5 times the screen size.

💡 Expert Tip: Go Bigger!

Buyer's remorse usually happens when people buy a TV that's too small, not too big. For a cinematic experience (THX standard), divide your viewing distance (in inches) by 0.84.
Example: 10 feet (120 inches) / 0.84 = 142 inch screen! (Or realistically, an 85-inch TV/Projector).

⚠️ Common Mistake: Mounting Too High

The center of your TV screen should be at eye level when you are seated. This is usually about 42 inches from the floor. Mounting a TV above a fireplace is popular but terrible for your neck!

Reviewed by: David Wilson, Home Theater Specialist
Last updated: November 27, 2025

Frequently Asked Questions

How far should I sit from a 65-inch TV?

For a 4K TV, the ideal distance is between 5.5 and 8 feet. For a 1080p TV, you should sit further back, about 8 to 13.5 feet.

Is bigger always better?

Not always. If the TV is too big for the viewing distance, you might see pixelation or suffer from eye fatigue. However, most people regret buying too small rather than too big.

What is the 40-degree rule?

THX recommends that the screen fills at least 40 degrees of your horizontal field of view for a cinematic experience. This usually means a larger screen or sitting closer.