Xiaomi Redmi 9 screen diagonal: how many inches and how it affects the choice of accessories

Xiaomi Redmi 9 has become one of the most popular budget devices of 2020 due to its balanced characteristics and affordable price. But when choosing accessories - covers, protective glasses or holders - users often face the question: how many inches of screen does this model have? The answer seems simple, but in practice there are nuances: manufacturers specify the diagonal in different ways, and the physical dimensions of the case can be misleading.

In this article, we will not only reveal the exact parameters of the Redmi 9 screen in inches and centimeters, but also explain why this information is critical for buying accessories. You will learn how diagonal affects the perception of content, compare the model with other Xiaomi smartphones and understand why sometimes cases “do not fit”, even if the correct numbers are indicated, and at the end – practical tips for choosing security accessories without errors.

Official specs: Redmi 9 screen diagonal in inches

According to Xiaomi’s technical documentation, the Redmi 9 is equipped with a 6.53-inch screen, which is indicated on the brand’s official website, in store specifications and on the device’s packaging, but it is important to understand that this is the diagonal of the matrix – the distance between opposite angles of the display, not including the frame of the case.

By comparison, the popular Redmi Note 9 has a 6.53-inch screen and the Redmi 9A has a 6.53-inch screen. It doesn't seem to make a difference, but in practice, even minimal differences in aspect ratio or bezel thickness can affect accessory compatibility. For example, a Redmi 9 case may not fit the Redmi 9C despite having the same screen diagonal.

• 📏 Screen size: 6.53 inches (16.59 cm)
• 🔲 Side ratio: 19.5:9 (extended format)
• 🎨 Permission: 2340 × 1080 pixels (Full) HD+)
• 🔄 Type of matrix: IPS LCD Support for Reading Mode 2.0

Interestingly, some Chinese sources indicate the diagonal as 6.5 inches, which is a rounded value. But for accurate accessory selection, it is better to focus on the official 6.53 inches. It is also worth considering that the physical size of the Redmi 9 body is approximately 163.3 × 77 × 9.1 mm, and the screen occupies about 83% of the front panel.

How to convert inches to centimeters and why it matters

Many users are used to operating with centimeters, especially when it comes to buying protective glasses or covers. To convert the diagonal of Redmi 9 from inches to centimeters, use a simple formula:

⚠️ Attention: 1 lens = 2.54 See: Multiply the diagonal in inches by 2.54, To get the value in centimeters. 9: 6.53 × 2.54 ≈ 16.59 centimeter.

But there's a catch: Accessories manufacturers often give sizes with an error of ±0.1 cm, which means that the "16.6 cm" protective glass may be perfect, while the "16.5 cm" glass may not. It's also important to consider the radius of rounding of the corners of the screen (Redmi 9 has a ~2.5 mm) that affects the landing of films and glasses.

If you buy accessories online, pay attention to reviews: often users leave photos where you can see how accurately the case or glass fits the Redmi 9. For example, some protective glasses cover only the flat part of the screen, leaving the rounded edges unprotected – this is normal for this model.

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When buying a case, check if it is listed as Redmi 9 compatible (M2003J15SC) - this is the full model name for the international version. The Chinese versions (M2003J15SC and M2003J15SS) may have minor differences in size.

Comparison with other Xiaomi models: who is more, who is less

To better understand how big the Redmi 9’s screen is, compare it to other popular smartphones of the brand, which will help assess usability – for example, for a single hand grip or watching a video.

• 📱 Redmi 9A: 6.53” (same diagonal but permission HD+)
• 📱 Redmi Note 9: 6.53" (Full HD+, different processor)
• 📱 Redmi 9C: 6.53" (HD+, budget)
• 📱 Poco M3: 6.53" (Full HD+, but with a different design)
• 📱 Mi 10T Lite: 6.67” (up 0.14 inches)

As you can see, the 6.53-inch diagonal has become standard for the budget and mid-budget Xiaomi models of 2020-2021.

• 🔍 The Redmi 9 has an aspect ratio of 19.5:9 and the Mi has a side ratio of 19.5:9. 10T Lite is 20:9, so the latter seems more elongated.
• 🖥️ Pixel density: 395 PPI Redmi 9 vs. 391 PPI Redmi 9A — the difference is almost imperceptible.
• 🎯 The Redmi has a 9-drop notch for the camera, and the Poco M3 — centre-piece.

If you choose between these models, consider the size of the body, not just the screen.For example, the Redmi 9 is 77 mm wide and the Mi 10T Lite is 76.4 mm wide, making it a little more comfortable to hold with one hand, despite its large diagonal.

Pay special attention to the safety glass. Redmi 9 fits the windows with the following parameters:

• 📐 Width: 68-70 mm (with respect to roundings)
• 📏 Height: 145-147 mm
• 🕳️ Neck: circular hole diameter ~4 mm for front camera

⚠️ Warning: Some cheap glasses close the proximity sensor (near the camera), which leads to problems with automatically turning off the screen during calls.

If you are buying a cover, pay attention to:

• 🔍 Redmi 9 has a main camera in a vertical block with flash.
• 🔊 Loopholes for speakers: The lower speaker is to the right of the connector USB-C. If the hole is shifted, the sound will be muffled.
• 🔋 Access buttons: The power and volume buttons on Redmi 9 are located on the right side.

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Even if the case or glass is listed as compatible with Redmi 9, always check the photos of real users in reviews - this will help to avoid landing errors.

Frequent mistakes in the selection of accessories diagonally

Many users are facing problems with the wrong approach to accessory selection, and here are the most common mistakes and how to avoid them:

1. Ignoring the model, like buying a case for the Redmi 9 Pro (which is actually the Redmi Note 9 Pro) instead of the Redmi 9. These devices have different body sizes, despite the similar names.
2. Diagonal-only orientation. As we've already seen, two smartphones may have the same diagonal, but different aspect ratios and arrangement of elements.
3. Material neglect: Silicone cases stretch and can sit even when they don't match, and plastic cases require perfect fit.
4. Buying universal accessories: Glass or a case labeled "6.5 inches" rarely works perfectly - they are designed for the "medium" smartphone and often leave gaps.

Another common problem is the discrepancy of the cutouts, for example, if you buy glass for a Redmi 9A (which has a left-handed cutout), it won't work for a Redmi 9, where the camera is in the middle of the top bezel, and the same goes for cases: the camera hole may not match, which will make the photos appear with dimming.

To avoid mistakes:

• 🛒 Look for accessories marked "exact pattern" or "laser-cut".
• 📸 Check the availability of real photos from buyers in reviews.
• 🔍 Use the filter using the exact model (M2003J15SC for the global Redmi 9).

Where to see the screen diagonal on the smartphone itself

If you already own Xiaomi Redmi 9 and want to clarify the screen size without searching the Internet, there are several ways:

1. Through system settings: Open Settings → About your phone. Find the Device Characteristics or Specifications section. Scroll to Screen, and it will show the diagonal.
2. Using AIDA64: Install the app from Google Play. Go to Display. Find the line "Size" and it will be the exact diagonal in inches.

Note that the diagonal can be rounded in the smartphone settings (e.g. 6.5" instead of 6.53"). This is not a mistake, but a simplification for the user. For accurate accessory selection, it is better to focus on the official specifications or data from AIDA64.

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If you buy a case or glass from an offline store, take your smartphone with you and check the landing on the spot. Even if the seller assures you that the accessory is suitable, it is better to be safe.

FAQ: Frequent questions about Redmi 9 diagonal