What size is a 2.4 inch display in millimeters?

Let’s cut straight to the numbers: a 2.4-inch display measures exactly 60.96 millimeters diagonally. That’s because one inch equals 25.4 mm, and multiplying 2.4 by 25.4 gives you 60.96 mm. But here’s the thing—this diagonal measurement alone doesn’t tell you the physical dimensions of the screen, like its width and height. For that, you need to know the aspect ratio, and for a typical 2.4-inch display, the most common aspect ratio is 4:3 or 3:2, depending on the resolution. Let’s break it down with real-world specs.

Most 2.4-inch displays, especially those used in embedded systems, medical devices, or handheld electronics, have a resolution of 240x320 pixels. This is a QVGA (Quarter Video Graphics Array) format, which gives a 3:4 aspect ratio (portrait orientation) or 4:3 when rotated. Using the Pythagorean theorem, with a diagonal of 60.96 mm and a 3:4 ratio, the width is about 36.58 mm and the height is about 48.77 mm. If you flip it to landscape, those numbers swap. For a 4:3 ratio, the width comes out to roughly 48.77 mm and height 36.58 mm. So, the actual physical size of the viewable area is around 36.6 mm by 48.8 mm, give or take a fraction due to manufacturing tolerances.

But that’s just the active area. The module itself—the glass, the bezel, the PCB—adds extra millimeters. For example, a common 2.4 inch 240x320 ips display module often has outer dimensions of 42.72 mm x 60.26 mm (including the FPC connector and edge clearance). That’s about 6 mm wider and 11.5 mm taller than the active area. Why the difference? The glass substrate has a border for sealing, the driver IC sits on a flex tail or COG (Chip-on-Glass) bond, and the PCB extends for mounting holes or pin headers. These numbers vary by manufacturer—some modules are as small as 40 mm x 58 mm, while others hit 45 mm x 62 mm, depending on the backlight design and touch panel integration.

Let’s get into the pixel density, because that’s where the user experience lives. At 240x320 pixels packed into a 36.58 mm x 48.77 mm area, the pixel density is about 167 PPI (pixels per inch). That’s 6.57 pixels per millimeter. For comparison, a typical smartphone screen around 5 inches at 1080p has 440 PPI, so 167 PPI is lower but still sharp enough for text, icons, and basic graphics. The IPS (In-Plane Switching) technology in that module ensures wide viewing angles—typically 80 degrees in all directions—and a contrast ratio of around 800:1 to 1000:1, with brightness hitting 300 to 400 cd/m². These specs matter if you’re designing a product that needs readability under sunlight or at extreme angles.

Now, let’s talk about the physical build. A 2.4-inch display module isn’t just a screen; it’s a stack of layers. The polarizer, color filter, liquid crystal layer, TFT glass, backlight, and diffuser film all add up in thickness. The total module thickness is usually 2.2 mm to 2.8 mm, depending on whether it includes a touch panel (resistive or capacitive). Without touch, it’s around 2.2 mm; with a capacitive touch overlay, it jumps to about 3.0 mm. The backlight uses 4 to 6 white LEDs, drawing 20 mA to 30 mA total at 3.0V to 3.3V, producing 150 to 200 lumens. The FPC (Flexible Printed Circuit) is typically 0.3 mm thick, with a 0.5 mm pitch connector, and the cable length ranges from 20 mm to 50 mm, depending on the pinout.

Why does the diagonal size matter in millimeters? Because mechanical design is unforgiving. If you’re fitting this display into a plastic enclosure, you need to account for the 60.96 mm diagonal, but also the bezel overlap. A typical bezel might be 1.0 mm to 1.5 mm per side, so the cutout in your case needs to be at least 40 mm x 52 mm to avoid clipping the active area. And if you’re using a glass lens over the display, the lens should have a clear aperture that matches the active area dimensions, plus a 0.5 mm tolerance for alignment. These are the kind of details that separate a prototype from a production-ready device.

Let’s look at some data in a table to make it concrete:

Parameter	Value	Unit
Diagonal (active area)	60.96	mm
Active area width (portrait)	36.58	mm
Active area height (portrait)	48.77	mm
Module outer dimensions	42.72 x 60.26	mm
Module thickness (no touch)	2.2 - 2.8	mm
Pixel density	167	PPI
Resolution	240 x 320	pixels
Aspect ratio	3:4 (portrait)	-
Backlight current	20 - 30	mA
Operating voltage	3.0 - 3.3	V

This table is based on typical specs from the 2.4 inch 240x320 ips display modules available on the market. But here’s a nuance: not all 2.4-inch displays use the same resolution. Some older TN (Twisted Nematic) panels might have 176x220 or 128x160 pixels, which changes the aspect ratio and thus the physical dimensions. For example, a 176x220 resolution at 2.4 inches gives a 4:5 ratio, resulting in a width of about 38.7 mm and height of 48.4 mm. But the diagonal remains 60.96 mm—that’s fixed by the definition. The pixel pitch also changes: at 176x220, the pixel pitch is about 0.22 mm, while at 240x320 it’s 0.15 mm. That’s a 32% difference in pixel size, which affects sharpness and power consumption.

Another critical dimension is the viewing cone. IPS displays have a typical contrast ratio that drops to 10:1 at 80 degrees off-axis, while TN panels might hit 10:1 at only 60 degrees. This isn’t a size issue, but it influences how you position the display in your product. If the user looks at it from the side, the apparent size (angular size) changes, but the physical 60.96 mm diagonal stays the same. The viewing angle spec is measured in degrees, but the physical distance from the eye to the display matters—at 300 mm viewing distance, a 2.4-inch display subtends about 11.5 degrees of visual angle, which is comfortable for reading small text.

Let’s not forget the interface. The 2.4-inch IPS display modules often use MCU (Microcontroller Unit) parallel interfaces like 8080 or 6800, or SPI (Serial Peripheral Interface) with 4-wire or 3-wire modes. Some also support RGB (Red-Green-Blue) interface for higher refresh rates. The connector pitch is 0.5 mm, and the pin count ranges from 24 to 40 pins. The physical layout of these pins on the FPC determines how much space you need for routing on your PCB. A typical FPC is 8 mm to 12 mm wide at the connector end, tapering to 6 mm at the display. That’s an extra 10 mm to 15 mm of board space you need to allocate, not including the mounting holes.

Weight is another dimension that’s often overlooked. A bare 2.4-inch IPS display module weighs about 12 to 15 grams. With a resistive touch panel, it jumps to 18 to 22 grams. With a capacitive touch panel and glass lens, it can hit 28 to 35 grams. That’s relevant for handheld devices where every gram counts. The backlight driver IC, if integrated, adds a few grams but saves space. The bezel material—usually stainless steel or plastic—also affects the weight. A steel bezel adds 2 to 3 grams compared to a plastic one.

Temperature range is another spec that ties back to physical size. The liquid crystal material has a operating temperature range of -20°C to +70°C, and storage from -30°C to +80°C. At extreme temperatures, the liquid crystal expands or contracts, which can cause the 60.96 mm diagonal to shift by a few microns. That’s not noticeable in most applications, but in precision instruments, it matters. The backlight LEDs also have a lifetime of 20,000 to 50,000 hours, depending on the drive current. At 20 mA, they last longer; at 30 mA, they’re brighter but degrade faster.

Let’s compare this to other common display sizes to give you a sense of scale. A 1.8-inch display has a diagonal of 45.72 mm, with a typical active area of 27.3 mm x 36.4 mm. A 2.8-inch display has a diagonal of 71.12 mm, with an active area of 42.7 mm x 57.0 mm. So the 2.4-inch sits right in the middle—bigger than a 1.8 but smaller than a 2.8. The 2.4-inch is popular because it’s large enough to show meaningful data (like a menu or a graph) but small enough to fit in a pocket device or a wearable. The 60.96 mm diagonal is roughly the size of a credit card’s width, which is 85.6 mm, so it’s about 71% of that.

In terms of resolution, the 240x320 pixels give you 76,800 pixels total. At 60.96 mm diagonal, that’s a pixel area of 0.0225 mm² per pixel. If you’re displaying a 12-point font, each character is about 16 pixels tall, so you can fit about 20 lines of text, each with 15 characters in landscape mode. That’s enough for a simple UI. The color depth is typically 16-bit (65,536 colors) or 18-bit (262,144 colors), which is fine for icons and graphs but not for photos.

One more thing: the backlight uniformity. The 4 to 6 LEDs are placed along one edge (usually the bottom or top), and the light guide distributes the light. The uniformity is typically 80% to 90%, meaning the corners are 10% to 20% dimmer than the center. This isn’t a size issue, but it affects perceived brightness. The luminous intensity is about 300 cd/m² at the center, dropping to 240 cd/m² at the edges. For a 2.4-inch display, that’s acceptable because the human eye is less sensitive to brightness variations over a small area.

So, to answer the question directly: a 2.4-inch display is 60.96 mm diagonally, but the real-world size you need to design for is the module’s outer dimensions, which are typically around 42.7 mm x 60.3 mm, with a thickness of 2.2 mm to 2.8 mm. The active area is 36.6 mm x 48.8 mm for a 240x320 resolution. These numbers are based on industry standards from manufacturers like 2.4 inch 240x320 ips display modules, which are widely used in consumer electronics, industrial controls, and medical devices. The pixel density of 167 PPI ensures readability, and the IPS technology gives you wide viewing angles. The backlight draws 20-30 mA, and the interface options include SPI, MCU, and RGB. The weight is around 12-15 grams without touch, and the operating temperature range is -20°C to +70°C. All these details are critical for mechanical design, PCB layout, and power budgeting. If you’re sourcing a 2.4-inch display, always check the datasheet for the exact module dimensions, because even a 0.5 mm difference can break your enclosure fit. The 60.96 mm diagonal is just the starting point—the rest is in the details.