45 Inch Monitor Dimensions | Sizes By Aspect Ratio

A 45-inch monitor measures 45 inches diagonally — about 114.3 cm — but width and height vary sharply by aspect ratio and curvature.

That “45 inches” is the diagonal measurement, not the screen’s physical width. Before you clear space on your desk or measure a wall mount, the numbers you actually need — width, height, and depth — depend on the aspect ratio and whether the monitor has a curved panel. A 45-inch ultrawide, for example, is far wider than a standard 16:9 display with the same diagonal.

This guide breaks down the real dimensions for the common aspect ratios, shows exact published specs for current LG models, and flags the measurement mistakes that cause expensive returns.

What Dimensions Come With Each Aspect Ratio?

Screen area scales differently across ratios, so the same 45-inch diagonal produces very different physical footprints. The numbers below reflect screen width and height, excluding bezels and the stand.

Notice how much taller the 4:3 screen is despite being the narrowest — and how the cinema-ratio screen is the widest but shortest. That’s why checking the aspect ratio matters more than the diagonal number itself.

Real 45-Inch Models: LG’s Published Dimensions

LG makes several of the most popular 45-inch monitors right now, and its published specs show why you must separate the screen from the full package. The LG 45GR75DC-B and LG 45GR65DC-B share the same physical footprint: with the stand at its lowest position, each measures 42.7″ x 17.7″ x 12.9″; raised to maximum height, it’s 42.7″ x 22.0″ x 12.9″. Remove the stand entirely and the panel alone is 42.7″ x 13.1″ x 6.4″.

The LG 45GS95QE-B follows a different shape. With its stand it spans 39.1″ x 21.2″ x 13.2″ at the lowest setting, extending to 39.1″ x 25.9″ x 13.2″ at the top. Without the stand, this model drops to 39.1″ x 18.0″ x 8.6″. The LG 45GR95QE-B, an 800R-curved OLED, is similarly wide and demands real desk depth.

These are not edge cases — they’re the difference between a monitor that fits your desk and one that hangs off it. Always confirm the “with stand” height for your desk clearance and the “without stand” numbers for a VESA arm setup.

Do Curved Ultrawide Monitors Measure Differently?

Yes, and the difference can surprise you. A curved 21:9 panel like the LG 45GR95QE-B lists its size as 45 inches, but its physical width is considerably more than a 16:9 screen with the same diagonal. The curvature also affects depth — the stand on curved models often needs more room front-to-back than the panel width suggests.

That means the screen is far wider than a standard QHD monitor, and the height is noticeably shorter per inch of diagonal. Measure your desk’s usable width AND its front-to-back depth before buying; many of these models exceed 39 inches wide even before you account for the stand’s footprint.

Before You Buy: Desk Fit and Mounting

Check the VESA mount pattern if you plan to use an arm — LG’s 45GR95QE-B and 45GS95QE-B support VESA mounting per their spec sheets. With an arm, you bypass the stand height range entirely, but you still need a desk deep enough to hold the panel at your preferred viewing distance.

Also note that some 45-inch models use OLED panels, which deliver superb contrast but can be susceptible to burn-in with static content. For mixed use with taskbars and documents, weigh that trade-off against your needs.

See our tested picks for the best 45-inch monitors when you’re ready to compare current models side by side.