How to find out the screen size of Xiaomi phone: diagonal, resolution and physical parameters

Smartphone screen size is a key parameter that affects usability, display quality and even the cost of the device. Xiaomi has a diagonal range from compact 4.5" in budget models to 7.4" in flagship "maxi" versions. But how to accurately determine this parameter if there is no documentation or box at hand? This is especially true for used devices or models with non-standard modifications (for example, Xiaomi Mix Fold with a flexible screen).

In this article, we will look at all the available methods, from standard MIUI settings to engineering menus and external tools, and you will learn not only the diagonal, but also the physical resolution, pixel density (PPI), and matrix type (AMOLED, IPS), which will be useful when choosing covers, protective glasses or comparing characteristics before buying.

⚠️ Note: Some methods (e.g., engineering menus) may vary depending on the version MIUI On custom firmware devices, some of the functions may not be available.

1. Method: through phone settings (without additional tools)

The easiest and most versatile method is to use the built-in MIUI settings. It works on all Xiaomi models, including Redmi, POCO and Black Shark, regardless of the firmware version.

Open the Settings menu → It's about the phone. Most of the time, it's showing basic model information, but not always the diagonal of the screen, to see the full specs:

1. Go to Settings → About the phone → All specs.
2. Scroll down to the Screen section (or Display in English).
3. Here will be listed: 📏 Screen size (e.g., screen size, 6.67" Xiaomi 13 Pro). 🖥️ Permission (e.g. authorization, 3200×1440). 🔄 Frequency of update (e.g, 120 Hz).

⚠️ Note: Some budget models (e.g. Redmi) 9A) The screen section may not be available, in which case use alternative methods from the following sections.

2. Method: through the engineering menu (for experienced users)

The engineering menu (#4636##) hides advanced hardware data, including screen settings, which is suitable for pure Android devices or custom firmware where standard MIUI settings are cropped.

Instructions:

1. Open the Phone app and enter the combination: ##4636###.
2. In the menu that opens, select Phone Information (or Phone Information).
3. Scroll down to the Display block: 📱 Physical Size – Physical diagonal in inches. 🎨 Resolution – resolution in pixels (e.g., resolution, 1080×2400). 🔢 Density – The density of pixels (DPI).

💡 On some devices, the engineering menu may be blocked by the manufacturer, in which case, use the apps from Google Play (see section 4).

Method: by phone model (online databases)

If the phone is not turning on or you are just planning to buy, you can determine the size of the screen by the exact name of the model.

1. Find the model on the back cover or in documents (e.g. Xiaomi 12T Pro or Redmi Note 11 Pro+ 5G).
2. Type the name into the search bar with the addition of the phrase "specifications" or "characteristics".
3. Use proven sources: 🌍 Official Xiaomi website (Section "Products"). 📊 GSMArena database (the most complete catalogue). 🛒 Product cards on Amazon or AliExpress.

Example: For POCO F5 Pro, GSMArena specifies:

• Diagonal: 6.67”.
• Resolution: 3200×1440 (2K+).
• Technology: AMOLED, 120 Hz.

⚠️ Note: Some sites (e.g. marketplaces) may contain inaccurate data. Always check with official sources or GSMArena.

4. Method: with the help of third-party applications

If standard methods don't work, specialized tools will come to the rescue, not only showing the diagonal, but also providing detailed information about the matrix, color gamut and even the screen manufacturer.

Top.-3 apps:

• 📱 AIDA64 — Physical Screen Size is shown in the Display section. Available for free on Google Play.
• 🔍 CPU-Z — The Device tab contains data on resolution and pixel density.
• 📊 Phone INFO ★Samsung★ — Despite the name, it works on Xiaomi. Screen Size shows in the Hardware section.

Example of the report from AIDA64 for Xiaomi 11T Pro:

Display:




Resolution: 3200 × 1440 pixels




Physical Size: 6.67 inches (~109.2 cm²)




Pixel Density: ~526 PPI




Technology: AMOLED, 120 Hz, HDR10+




Manufacturer: Samsung (E4)

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If the app shows a diagonal in centimeters, translate it into inches: 1 inch ≈ 2.54 cm For example, 16.94 cm ≈ 6.67.

Method: by physical measurements (for accuracy)

If you want absolute accuracy (for example, for the selection of protective glass or repair), you can measure the screen manually. This method requires accuracy, but gives the result with an error of no more than 0.05. "

What you need:

• 📏 Line or bar (preferably metallic).
• 📐 Corner for checking right angles.
• 🧮 Calculator for calculating diagonal.

Step-by-step:

1. Turn off the phone and take off the case.
2. Measure the visible area of the screen (without considering the frames) horizontally (A) and vertically (B) in centimeters.
3. Use the formula for diagonal: Diagonal (inches) = √(A² + B²) / 2.54 For example, for the Redmi Note 10 Pro with dimensions 15.9 × 7.1 centimeter: √(15.9² + 7.1²) ≈ 17.4 centimeter → 17.4 / 2.54 ≈ 6.85".

⚠️ Note: Note that modern Xiaomi smartphones often have rounded corners of the screen. Measure the distance between opposite sides in the center, not at the edges.

6. Method: by box or documents

If you have the original packaging or documents, the screen size is usually indicated:

• 📦 On the front of the box, next to the model name (e.g. 6.67" AMOLED).
• 📄 In the warranty card or instructions - in the section "Technical characteristics".
• 🏷️ On the back of the box (in small print).

Example of markings on the box Xiaomi 12S Ultra:

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If you buy a used phone, always ask for a photo of the box or a check, which will help avoid changing the model (for example, instead of Redmi Note 11 Pro can sell Note 11S with a smaller screen).

Comparison of methods: which one to choose?

Each method has its pros and cons, and the choice depends on your situation:

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For most users, the first three methods are sufficient; physical measurements and engineering menus are only useful in specific cases (repair, custom firmware).

FAQ: Frequent questions about Xiaomi screen sizes