45 Inch Ultrawide Monitor Dimensions
A 45 inch ultrawide monitor has a screen 41.5 in105.4 cm wide and 17.4 in44.1 cm tall (105.4 cm41.5 in x 44.1 cm17.4 in). The 45 inches is measured diagonally across the glass, corner to corner. The ultrawide monitor itself is always a little bigger than these numbers.
Below you can see it to scale and check it against your desk. You will also find the resolution and scaling that suit this size.
- Width
- 41.5 in 105.4 cm
- Height
- 17.4 in 44.1 cm
- Diagonal
- 45 in 114.3 cm
- Aspect ratio
- 21:9
How big is a 45 inch ultrawide monitor?
Here it is drawn to scale against the largest size in our chart, the 49 inch. The screen covers 721 sq in4,653 sq cm, 9% less than a 43 inch monitor.
- Diagonal
- 45 in (114.3 cm)
- Width
- 41.5 in105.4 cm · 105.4 cm41.5 in
- Height
- 17.4 in44.1 cm · 44.1 cm17.4 in
- Screen area
- 721 sq in4,653 sq cm
- Aspect ratio
- 21:9
- Perimeter
- 117.8 in299.1 cm
- Pixel density at 2560 × 1080
- 62 PPI
- Pixel density at 3440 × 1440
- 83 PPI
- Pixel density at 5120 × 2160
- 123 PPI
How big is a 45 inch ultrawide monitor with the stand?
Stands add height and depth, and frame widths vary. Here are the real measurements of popular 45 inch monitors from their makers' spec sheets.
Each model name links to its maker's spec sheet. Prices open on Amazon (affiliate links).
What did the real models show?
The table lists three 45 inch ultrawide monitors from Acer, AOC and LG. Every one is 39.1 in99.3 cm wide.
Without its stand, the Acer Predator X45 (UM.MXXAA.001) is the thinnest at 3.1 in7.9 cm deep. At the other end, the AOC AG456UCZD is 8.7 in22.0 cm deep.
Weights run from 18.9 lb8.6 kg for the LG 45GR95QE-B to 25.02 lb11.3 kg for the AOC AG456UCZD. A monitor arm rated for 26 lb11.8 kg or more covers the weight of every model here.
Where the makers list it, the height with the stand runs from 20.0 in50.9 cm to 21.2 in53.8 cm. On their stands, they take 13.8 in34.9 cm to 14.3 in36.3 cm of desk depth.
They use two VESA patterns, from 100 x 100 to 200 x 100 mm. The most common is 100 x 100 mm, on two of them, but check your exact model before you buy an arm.
Will a 45 inch ultrawide monitor fit on your desk?
Enter the space on your desk, under any shelf or cabinet. We check it against the screen, and the table above shows what each stand adds.
How much desk do two or three need?
Two 45 inch screens side by side need at least 83.0 in210.9 cm (210.9 cm83.0 in) of desk width for the screens alone. Three need 124.5 in316.3 cm (316.3 cm124.5 in). Add the frame widths from the table above.
That screen is about as wide as two 23.8 inch monitors side by side, without the frames between them.
How far should you sit from a 45 inch ultrawide monitor?
Desk screens are usually viewed from 20 to 30 in (50 to 75 cm). The table shows how much of your view a 45 inch screen fills at each distance. It feels very wide at every distance in the table, from 18 to 32 in46 to 81 cm, so expect to turn your head.
Which resolution suits a 45 inch ultrawide monitor?
Higher resolution looks sharper but makes text smaller, so you need display scaling. At 45 inches, 2560 × 1080 gives 62 PPI and 5120 × 2160 gives 123 PPI. The table shows the Windows scaling each needs.
At this size, 2560 × 1080 and 3440 × 1440 look soft and 5120 × 2160 looks crisp. 2560 × 1080 and 3440 × 1440 work at 100% scaling, while 5120 × 2160 needs 125%.
Sit farther away than the last column and you will not see single pixels. See every resolution in the chart.
How does a 45 inch ultrawide monitor compare with other sizes?
The next size up, the 49 inch ultrawide monitor, has 13% less screen area. The next size down, the 43 inch monitor, has 10% more screen area. Area grows with the square of the diagonal, so a few inches feel bigger than they sound.
That makes the size up a clear step, and the size down a small step.
Shop 45 inch monitors and desk gear
Affiliate linksMore questions about 45 inch monitors
What are the dimensions of a 45 inch monitor in cm?
The screen is 105.4 x 44.1 cm, with a diagonal of 114.3 cm.
Is a 45 inch monitor too big for a desk?
At 24 in away it fills 82 degrees of your view. Above about 40 degrees, you may need to move your head to see the edges.
Is a 45 inch monitor 45 inches wide?
No. 45 inches is the diagonal, and the screen is 41.5 in wide.
What resolution is best for a 45 inch monitor?
5120 × 2160 gives 123 PPI at this size, which suits 125% Windows scaling. Higher resolutions look sharper but need more scaling, so text stays readable.
How much does a 45 inch monitor weigh?
The models above weigh 18.9 lb (8.6 kg) to 25.02 lb (11.3 kg) without the stand. The lightest is the LG 45GR95QE-B, and the heaviest is the AOC AG456UCZD.
Which of these 45 inch monitors is the thinnest?
The Acer Predator X45 (UM.MXXAA.001) is the thinnest in the table, at 3.1 in (7.9 cm) deep without the stand. On an arm, that is close to all the depth it takes, while a stand needs more desk.
How we measure
Screen width = diagonal x a / sqrt(a^2 + b^2) and height = diagonal x b / sqrt(a^2 + b^2) for an a:b screen. Viewing angle = 2 x arctan(half the screen width / distance). Pixel visibility uses 1 arcminute, the limit of 20/20 vision.
Model sizes come from each maker's published spec sheet, linked in the table. Last checked 2026-10-09.