The panel numbers, in one line
A 70-inch 16:9 panel is 61.01 by 34.32 inches — 155.0 by 87.2 cm — and covers 2,093.8 square inches, which is 13,508.2 square centimetres.
That is the lit rectangle and nothing else. The same working for the size below sits on the 65-inch page, and the width-only figures for the size above are on the 75-inch page.
Depth is not a panel number
The panel is a sheet of glass with a lit layer behind it. It has a width and a height because those are the edges of the picture. It has no depth worth measuring, and no depth can be worked out from 70 inches and 16:9 — the geometry above only ever gives two sides.
Depth belongs to the finished set: the backlight, the chassis behind the glass, the electronics, the frame, and the stand if it stands on one. That is why the numbers published for it move so much at the same diagonal, and why they arrive as single readings for single models rather than one figure for the size.
What the public numbers cover. Five readings turn up for this size. They are quoted here as published, not recalculated, and each one is marked with whether the stand was on:
| Where the reading comes from | Depth | Stand |
|---|---|---|
| One model's spec sheet | 3 in (7.6 cm) | without |
| The same model's spec sheet | 11 in (27.9 cm) | with |
| A single-model dimension drawing | 2.9 in (7.4 cm) | without |
| An aggregate over 102 models | 2.83 in (7.2 cm) | without |
| A retailer answer for one model | 12.98 in (33.0 cm) | with |
Put end to end, the published depth for a 70-inch set runs from about 2.8 inches to 13 inches — 7.2 to 33 cm. The thin end is a chassis without its stand; the wide end is a set standing on its feet, where the stand's footprint runs backward.
One reading is left out on purpose. A seller of fitted covers publishes 12 cm (4.7 in) for a 70-inch set, but that number is the outside of a cover, not the set, so it is not part of the band above.
So when you measure a cabinet, measure the set. A 70-inch set needs 61.01 inches of width and 34.32 of height on the wall, but it needs whatever its own depth is on a shelf — and that figure only exists for a model, never for a size. On the model quoted above the two readings differ by eight inches, 3 against 11, and the only thing that changed was whether the stand was on.
Stand height is the other number that goes missing
The panel is 34.32 inches tall. Sets are taller than that, and the difference is not the frame — it is the stand, which lifts the whole chassis. Three published readings show how far:
| Reading | Height | Against the panel |
|---|---|---|
| One model, without stand | 34.5 in (87.6 cm) | +0.18 in |
| The same model, with stand | 36.4 in (92.5 cm) | +2.08 in |
| Another model, with stand | 38.48 in (97.7 cm) | +4.16 in |
| An aggregate over 102 models, without stand | 90.0 cm (35.43 in) | +1.11 in |
| The same aggregate, with stand | 97.0 cm (38.19 in) | +3.87 in |
The lift from a stand, read where both readings exist for the same set, is 1.9 inches on the first model and 2.76 inches on the aggregate. Read against the bare panel instead, the tallest published figure is 4.16 inches above it. Both ways of reading it land between 1.9 and 4.16 inches, and that is the only honest width of the band.
So if a height does not say with the stand, do not trust it. A listing that gives one height and no note is the single most common way this number goes wrong: the same set reads 34.5 inches without its stand and 36.4 with it, and nothing on the page tells you which one you were handed.
Checking a cabinet against the published band
Type your cabinet depth in the field above and the line under the results compares it with the published spread. The comparison is deliberately coarse, because the published numbers are coarse: it puts your figure against the ends of the band and says which side of them you are on, and it does not invent a value in between.
At 13 inches or more the cabinet clears the widest published figure, which is a set with its stand. Between 11 and 13 inches it clears a set on its feet up to 11 inches but not the widest. Between 3 and 11 inches it clears a set without its stand but not one standing on its feet. Between 2.8 and 3 inches only the thin end of the band fits. Under 2.8 inches nothing in the band fits.
That is as far as the public numbers go. This page will not invent a depth for a model it has not measured, and it will not turn a range into a single figure to look tidy.
How the panel numbers are calculated
Width, height and area come from the diagonal and the ratio, so nothing is looked up:
height = diagonal ÷ √((a ÷ b)² + 1)
width = (a ÷ b) × height
area = width × height
centimetres = inches × 2.54
square centimetres = square inches × 6.4516
PPI = √(pixels across² + pixels down²) ÷ diagonal
pixel pitch (mm) = width ÷ pixels across × 25.4
The ratio a:b is the width over the height, so 16:9 means 16 units across for every 9 down. For 70 inches at 16:9 the divisor is √((16 ÷ 9)² + 1) = 2.039729, and 70 ÷ 2.039729 = 34.3183. Width is 1.777778 × 34.3183 = 61.0103.
There is no third equation for depth, and none for stand height. Neither is in the geometry, and neither is in the resolution: 3840 × 2160 changes the pixel density and nothing else.
What is rounded
Width and height are shown to 2 decimals in inches and 1 decimal in centimetres, and the area to 1 decimal in both units. The arithmetic runs at full precision and only the display is rounded — 61.0103 reads as 61.01, 34.3183 as 34.32, 154.9666 as 155.0, and 2,093.77 as 2,093.8.
Pixel density is shown to 2 decimals and pixel pitch to 4, because a pitch of 0.40 mm and one of 0.4036 mm are different pixels on a 4K screen of this size.
The cabinet line is not rounded in the sense that matters: it compares your number against the published ends of the band — 2.8, 3, 11 and 13 inches — and says which side of them you are on.
What is measured
Width, height and area are the active panel: the lit rectangle you watch. Bezels, the frame, the stand and the chassis depth are all excluded. The two range sections above are the only places on this page where anything outside the glass is discussed, and there they are published figures for finished sets, not calculations.
Questions this page answers
So how deep is a 70-inch TV?
There is no single answer for the size. Published readings run from about 2.8 inches to 13 inches, and the difference is the chassis and the stand, not the screen. Pick the model first, then read its depth.
Why does one listing say 3 inches and another 11 for the same TV?
One is measured without the stand and one with it. The stand's feet run backward, so the same set reads three inches against the wall and eleven on a shelf.
How much taller does the stand make it?
Between 1.9 and 2.76 inches on the sets where both heights are published, and the tallest published figure sits 4.16 inches above the bare panel. Plan for the taller end if the set goes on furniture.
My cabinet is 14 inches deep — will it fit?
At 14 inches you clear the widest published figure, 12.98 inches with the stand, so a set on its feet has room. You still need the height with the stand, which is taller than the panel.
Can I work the depth out from the diagonal?
No. The diagonal and the ratio give two sides of a rectangle and stop there. Depth comes from the backlight, the chassis and the stand, so it is a spec-sheet number, not a geometry one.
Is 61.01 inches the width of the whole TV?
No, that is the glass. The frame adds to it, and how much depends on the model, so a tape across the outside will read wider than 61.01.
What if the listing just says 34.3 inches tall?
Then it is probably the panel or the set without its stand, and it is not enough to check a shelf. Ask for the height with the stand; on the models quoted here that is 1.9 to 2.08 inches more.
Does the resolution change any of these numbers?
No. 3840 × 2160 changes the pixel density and the pixel pitch only. The width, the height and the area stay the same whatever resolution you pick.