70 vs 80 inch TV

The 80-inch screen is a big step up from the 70-inch: 31% more picture area and 8.7 in (22.1 cm) more width.

Dimensions, screen only

	70 inch	80 inch
Width	61.0 in (155.0 cm)	69.7 in (177.1 cm)
Height	34.3 in (87.2 cm)	39.2 in (99.6 cm)
Screen area	2094 in²	2735 in² (+31%)
PPI at 4K	63	55
PPI at 1080p	31	28

These are flat 16:9 panel dimensions, not the full TV body. The 80-inch needs 8.7 in (22.1 cm) more horizontal space and 4.9 in (12.5 cm) more vertical space. Check the exact model's frame, stand width, depth and ventilation clearance before buying.

How far should you sit?

For a 40° horizontal cinema target, sit 7.0 ft (2.1 m) from the 70-inch or 8.0 ft (2.4 m) from the 80-inch. A wider angle fills more of your view; a narrower angle makes the whole picture easier to take in. Your preferred angle depends on what you watch.

70 vs 80 inch TV from the same couch

Compare the horizontal viewing angles from four seats. Both screens stay at the same distance, so you can judge how much immersion the larger panel adds. Select a distance to open that exact setup in the calculator.

Horizontal field of view for flat 16:9 screens
Eye-to-screen distance	70 inch	80 inch
6 ft (1.83 m)	45.9°	51.7°
8 ft (2.44 m)	35.3°	39.9°
10 ft (3.05 m)	28.5°	32.4°
12 ft (3.66 m)	23.9°	27.2°

For example, at 8 ft (2.44 m), the 70-inch fills 35.3° and the 80-inch fills 39.9°. Use the TV size calculator for an 8-foot seat to compare those angles with your preferred viewing mood.

Will 4K look sharper on the smaller TV?

Both 4K screens have the same 3840 × 2160 pixels. The 70-inch packs them more tightly (63 PPI versus 55 PPI), but distance reduces that difference. The 60 PPD reference distance is 4.6 ft (1.4 m) for the 70-inch and 5.2 ft (1.6 m) for the 80-inch. Beyond both distances, individual pixels become harder to distinguish; HDR, contrast, motion handling and source quality can still make one TV look better.

For wall placement, the larger screen extends 2.5 in (6.2 cm) farther above and below the same center line. Use the mounting height calculator to check the bottom edge and your seated eye line.

Decided on a size? See current prices for 70-inch and 80-inch 4K TVs on Amazon.

Open this comparison in the calculator, drawn to scale

Reading this on an iPhone? Open it in the calculator and tap "Setup on your wall" to see the screens in your room at true physical size, in augmented reality.

Common questions

Which is better, a 70 inch or an 80 inch TV?

Choose the 80-inch if you want 31% more picture area and have room for its 69.7 in (177.1 cm) screen width plus the frame. Choose the 70-inch if space, budget or a less immersive view matters more. A 40° view occurs at 7.0 ft (2.1 m) and 8.0 ft (2.4 m), respectively. Compare the same-seat angles above; size alone does not determine picture quality.

How much bigger is an 80-inch TV than a 70-inch TV?

The 80-inch panel is 69.7 in (177.1 cm) wide and 39.2 in (99.6 cm) tall, against 61.0 in (155.0 cm) by 34.3 in (87.2 cm) for the 70-inch. That is 31% more screen area.

How far should I sit from an 80-inch TV?

For a cinematic picture filling THX's 40 degrees of view, sit about 8.0 ft (2.4 m) back. At 4K the 60 PPD reference distance is 5.2 ft (1.6 m); eyesight and content also affect perceived sharpness.

What are the dimensions of a 70-inch TV?

The screen itself measures 61.0 in (155.0 cm) wide by 34.3 in (87.2 cm) tall. Bezels and stand add to that depending on the model.

How these measurements are calculated

For a diagonal d and aspect ratio w:h, screen width is d × w / √(w² + h²), and height is d × h / √(w² + h²). Area is width × height; PPI is √(horizontal pixels² + vertical pixels²) / diagonal in inches. Results are rounded for display.

Screen dimensions exclude the frame, feet and stand. Check the manufacturer's measurements for furniture and mounting clearance. A flat-screen viewing angle is 2 × atan(width / (2 × eye-to-screen distance)). The 40° cinema target is a preference, not a requirement; adjust the viewing angle for your room. It is approximately equivalent, for a 16:9 screen, to the distance × 0.835 sizing rule in the THX viewing guide.

The 60 central pixels-per-degree reference is a rule of thumb, not a guarantee that two displays look identical. Eyesight, contrast, source quality and panel technology also matter. Check sharpness at your own viewing distance.

Every number on this page is computed from resolution and diagonal with the DisplayMath screen size calculator. Free, no signup, runs in your browser. Content updated 2026-09-09. Feedback? Email hello@displaymath.com or find us on Instagram. About · Privacy and affiliate disclosure. © 2026 DisplayMath. All rights reserved.