Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteMeasure a smartphone screen diagonally, from one corner of the active display to the opposite corner. Keep the ruler or tape measure on the display area—not the bezel or phone body—and record the result in inches to compare it with a manufacturer’s listed screen size.
How do I measure my phone screen size?
- Find the active display. Use the illuminated screen area as your boundary; do not start at the outer edge of the bezel, frame, or case.
- Measure corner to corner. Place a ruler or flexible tape measure at one corner of the display and measure in a straight line to the opposite corner. Either diagonal works.
- Record the measurement and unit. Smartphone display sizes are commonly stated in diagonal inches.
- Check the exact model’s specification. Compare your result with the manufacturer’s specification or user manual, keeping in mind that published figures may use a full-rectangle convention.
Samsung describes smartphone screen size as a diagonal measurement between opposite screen corners in its Australia phone-size guide. HONOR’s measurement guide likewise specifies the active display and excludes the bezel and frame.
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Do I measure the screen diagonally, and do I include the bezel?
Yes: screen size means the display’s diagonal, not the phone’s width or its top-to-bottom body height. Measure from one active-screen corner to the opposite one and leave the bezel and phone body out.
A diagonal alone does not tell you a phone’s screen width or height. Two phones with the same diagonal can differ in aspect ratio, shape, bezel proportions, and usable area. To compare how they fit your hand or pocket, check exterior width and height as well as the diagonal; try the device in hand if possible.
#1 Best Overall
- 【STAINLESS STEEL MATERIAL】The vernier caliper is made of high-strength stainless steel and is waterproof and dirt-proof. The service life of this stainless steel digital caliper is longer than that of calipers with plastic or carbon fiber parts.
- 【ACCURATE MEASUREMENT AND ZERO SETTING】This digital caliper glides smoothly. Measuring range: 0 -6" / 0-150mm; Accuracy: ± 0.001"/ 0.02mm; Resolution: 0. 0005"/0. 01mm. At the same time, the smart design allows you to easily reset to zero by pressing a button and start a new measurement at any point on the scale, which is very suitable for differential measurement.
- 【4 MEASUREMENT MODES】The digital caliper has 4 measurement modes, which can be used to measure inside and outside diameter, depth, and step with two sets of jaws and a probe. Multiple measurement modes can bring more usage scenarios to people, and the measurement process is also very convenient.
- 【UNIT CONVERSION & LARGER LCD SCREEN】These Digital Calipers have a one-key button to quickly switch from inches (inch), fractions (F), millimeters (mm). The 6" digital caliper has a large, easy-to-read LCD DISPLAY which is easy to use and read even under strong sunlight. It will automatically turn off after 5 minutes of non-use to save power.
- 【Wide Applications】 Compared to the ordinary rulers, this stainless steel caliper can measure not only length but also caliber and depth, allows you to measure circular and cylindrical objects, more functions and better performance will satisfy you. It has always been used by professionals and hobbyists alike, jewelers, hobbyists, woodworkers, machinists, DIY, automotive mechanics, and more.
Why might my measurement differ from the advertised size?
Manufacturers may state a nominal display size using a full-rectangle measurement, while rounded corners and camera openings reduce the area you can actually view. Samsung’s Australia guide gives a model-specific example: it lists the Galaxy S25 Ultra at 6.9 inches for the full rectangle and 6.8 inches when accounting for rounded corners. Those figures illustrate that phone’s convention; they are not a universal adjustment to apply to other models.
A small difference can also result from measuring by hand or choosing slightly different endpoints. For the listed figure, use the specification for the exact model rather than treating a physical measurement as the definitive advertised size.
Rank #2
- Best Cost-effectiveness: We've crafted this plastic digital caliper with a singular focus – delivering unmatched value at an unbeatable price. While others chase high-precision innovations, we prioritize essential features that truly matter.
- 4 Measurement Modes and Precision: Outside diameter, inside diameter, depth, and step measurements. Measurement range: 0-6 inches / 0-150 mm, accuracy: ±0.2 mm / 0.01 inches. Whether it's for home projects, DIY, or 3D print, having this caliper will elevate you to be a measurement star.
- Low Energy Consumption Design with Smart Auto-Off Function: With just a single battery, our caliper can support 8+ months of measurements. It can automatically turns on when you slide it, and turns off within 5 mins when not in use, effectively conserving battery power.
- Tough Plastic Case Packaging and Secure Measurements: The plastic case packaging effectively protects the caliper from external impacts and friction, ensuring that it stays in optimal condition at all times. Moreover, our digital caliper is made of extra strong carbon fiber composites that are not easy to damage the measured object during use.
- What You Get: Digital Caliper *1, Tough Plastic Case *1, and LR44 button batteries *3(with one pre-installed). Additionally, we offer a lifetime warranty and friendly customer service to ensure your complete satisfaction.
Is “Display size” in settings the phone’s physical screen size?
Not necessarily. Some phones use “display size” to describe a software scaling setting that changes how large interface elements appear, not the panel’s physical diagonal. ASUS documents a setting at Settings > Display > Display size and text; changing it adjusts the display-size preview. Labels and locations can vary by device and software version. See ASUS Support’s instructions.
How do I measure a phone screen for a screen protector?
Do not choose a protector or privacy filter by diagonal alone. Confirm the exact phone model and the product’s fit guidance. The needed coverage can depend on the visible width and height, glass edges, raised bezels, and camera openings.
Rank #3
- [INCH/MM Conversion]: One button can quickly convert two measuring unit (INCH/MM). Measuring Range:0 - 150mm (6") / Resolution: 0.01mm (0.0005")/Accuracy: ±0.02mm (0.001")
- [Stainless Steel Material]: The vernier caliper is made of high-strength stainless steel, which is waterproof, stain-proof and oil-proof. The ergonomic design brings you a comfortable feeling.
- [Large and Clear Display Screen]: Large LCD display gives you a clear reading. The thumb rolling and locking screw provide easy sliding, accurate positioning, and fine adjustment.
- [Multifunctional Use]: The digital micrometer can easily and accurately measure internal, external, height and depth dimensions.
- [Automatically shut off]: When you have no action on the dial caliper, it can automatically shut off after 4 minutes.
As general filter-fit guidance, 3M says to measure viewable height and width for a screen with a raised bezel, or the entire glass display edge to edge for flat front glass. Its measuring guide is written for monitors and laptops, not as a phone-specific fitting chart, so use the distinction only as general guidance and check the phone-specific product fit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does screen diagonal tell me which case to buy?
No. A case must match the exact phone model and its exterior shape and dimensions. The display diagonal does not establish the phone’s outside measurements or case fit.
Quick Recap
Best Value
- 【Stainless steel material】Digital calipers are made of high quality stainless steel, waterproof and rustproof, and the sturdy frame reduces the wear and tear of vernier calipers, allowing a longer service life
- 【Accurate measuring range】 0-12 inches/300mm; Display: 14mm x 40mm oversized LCD; Accuracy: ±0.04mm/0.0015 inches; Resolution: 0.01 mm/0.0005 inches. The knurled thumb roller ensures smooth gliding in use; the locking screw enables accurate positioning. These two designs ensure smooth operation during measurement and prevent slippage or jams from occurring
- 【4 measurement modes】The digital caliper comes with two pairs of jaws and a probe to easily measure depth, step length, outside diameter and inside diameter. Four measurement methods meet most of your measurement needs
- 【3 unit conversions】 With the push of a button, you can quickly switch between the 3 units of the digital caliper: inches, millimeters and fraction; plus the large LCD screen makes it easy to read. You can reset it to zero with the zero button, plus the digital vernier caliper will automatically turn off after 5 minutes of non-use to save power
- 【Wide application】HARDELL digital caliper comes with 1*ruler, 1*screwdriver, 2*batteries. The case is resistant to pressure, shock and drop for easy storage and carrying. 12 inch caliper micrometer has been used by professionals and amateurs, it is the best choice for mechanics, woodworkers, jewelers, craftsmen, DIY enthusiasts, auto mechanics, etc
Rank #4
- Solid stainless steel build – This digital caliper 6 inch resists rust, wear, and corrosion, outlasting plastic models. The sturdy metal body handles daily workshop use without bending. The shockproof case protects your measuring tool from drops and impacts, keeping it safe and ready for each job
- Reliable accuracy with smooth glide – This digital vernier caliper measures 0‑6″ / 0‑150mm with ±0.02mm / 0.001″ accuracy and 0.01mm resolution. The thumb roller glides without sticking, and the locking screw holds your reading steady. From checking 3D print filament and woodworking joints to measuring jewelry and small parts for repairs, you can trust the results
- Four measurement modes in one – Use two jaw pairs and a depth probe for ID, OD, depth, and step measurements. No need to switch digital caliper measuring tool – this versatile dial caliper covers tubing, bores, recesses, and shoulders. Press the zero button anywhere to reset for quick comparative checks. Close and re‑zero before each use to ensure consistent readings
- Metric & Imperial conversion with large LCD – This electronic vernier caliper lets you switch between millimeters and inches with one click. The oversized LCD screen displays crisp, bold numbers that are easy to read at a glance. The wide viewing angle means you can read it clearly without tilting the caliper. Auto‑off powers down after 5 minutes of non‑use to save battery
- Complete kit – ready out of the box – Your package includes the digital micrometer, a sturdy case, two batteries (one spare), a mini screwdriver, and a stainless steel ruler. No extra trips to the store – just open and start working. A practical choice for DIYers, hobbyists, and makers who need reliable measurements at home or in the workshop
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