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Screen Size Calculator

Calculate screen width, height, area, PPI, pixel pitch, and megapixels from diagonal size, aspect ratio, and optional pixel resolution.

Calculate physical dimensions and pixel density

Screen details

Optional pixel resolution

px
px

Screen dimensions47.94 × 26.96 in16:9 aspect ratio

Screen width47.94 in121.76 cm
Screen height26.96 in68.49 cm
Viewable area1292.58 in²8339.22 cm²
Pixel density80.11 PPI0.317 mm pitch
Total pixels8.294 MP3,840 × 2,160
Diagonal pixels4405.81Pixel-grid hypotenuse

Screen proportion

The outline follows the entered aspect ratio when it can remain legible; it is not displayed at physical size.

Screen measurement summary
Diagonal55.00 in
Width47.94 in
Height26.96 in
Aspect16:9
Density80.11 PPI

Results describe the viewable rectangular screen area. Product width and height can be larger because of bezels, frames, stands, or curved construction.

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What does the Screen Size Calculator calculate?

The Screen Size Calculator converts the values you enter into a structured estimate using the formulas and assumptions documented on this page. Use the result to compare scenarios, review the calculation details, and identify sensitive inputs. Check the guide and formula sections before using the estimate for an important decision.

Screen Size Calculator at a Glance

  • Finds viewable width, height, and area from a diagonal and aspect ratio.
  • Accepts inches or centimeters and converts both directions.
  • Supports common ratios and user-entered custom ratios.
  • Calculates PPI, pixel pitch, diagonal pixels, and megapixels when resolution is entered.
  • Warns when physical and pixel aspect ratios differ by more than 1%.
  • Includes a proportional diagram, accessible measurement table, embed, and PDF report.

A Short History of Screen Size

Television and display sizes are commonly identified by their viewable diagonal rather than width. The convention makes one number useful across different aspect ratios, but it can also make two displays with the same diagonal look very different. Modern screens add another dimension to the comparison: pixel resolution and physical pixel density.

What Does This Screen Size Calculator Do?

Enter a screen diagonal and physical aspect ratio to calculate the viewable rectangle. Optional pixel dimensions add density measurements. Results appear in both inches and centimeters, and the visual outline updates to match the selected ratio. Review the Screen Size Calculator assumptions before relying on this result for decisions.

Who Should Use It?

TV shoppers, monitor buyers, designers, developers, installers, educators, and anyone planning a desk, wall, enclosure, or comparison can use the tool. Always check the manufacturer's complete product dimensions when bezels, stands, depth, or mounting hardware matter. Review the Screen Size Calculator assumptions before relying on this result for decisions.

What Problems Does It Solve?

For “What Problems Does It Solve?,” the Screen Size Calculator organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.

  • Turns an advertised diagonal into viewable width and height.
  • Compares physical surface area across aspect ratios.
  • Converts screen dimensions between inches and centimeters.
  • Calculates pixel density from native resolution.
  • Detects a possible mismatch between the entered physical ratio and pixel grid.

Key Benefits

  • Flexible inputs: choose a common aspect ratio or enter custom components.
  • Optional resolution: physical dimensions work without pixel data.
  • Transparent precision: dimensions and PPI show two decimals; pitch and megapixels show three.
  • Responsive visual: the diagram is supported by an exact text table and accessible image description.
  • Consistent reports: the PDF uses the current inputs and the same calculation engine.

Screen Size Definitions

Diagonal
The straight-line distance between opposite corners of the viewable screen.
Aspect ratio
The proportional relationship between viewable width and height, such as 16:9.
Native resolution
The physical panel's horizontal and vertical pixel grid.
PPI
Pixels per inch, calculated from diagonal pixels divided by diagonal inches.
Pixel pitch
The approximate physical spacing between adjacent pixel positions, reported in millimeters.
Viewable area
The calculated width multiplied by height; it excludes bezels and casing.

When Should You Use This Calculator?

Use it before comparing TVs or monitors, planning a wall opening or desk layout, estimating physical display area, or comparing the density of devices that share a resolution. Use the actual panel ratio and native resolution for the most meaningful result.

How the Screen Calculation Works

The diagonal is the hypotenuse of a right triangle whose legs follow the aspect ratio: For a useful Screen Size Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.

Width=Daa2+b2,Height=Dba2+b2Width=D\frac{a}{\sqrt{a^2+b^2}},\qquad Height=D\frac{b}{\sqrt{a^2+b^2}}

See the complete screen size formulas for unit conversion, area, PPI, pixel pitch, and mismatch detection.

Common Screen Measurement Mistakes

  • Treating the advertised diagonal as the screen width.
  • Including the bezel, frame, stand, or casing in the viewable measurement.
  • Using an output setting or software scaling value instead of native resolution.
  • Assuming every ultrawide panel uses exactly the same physical ratio.
  • Rounding width and height before calculating area or PPI.

Frequently Asked Questions

How is screen size measured?

Screen size is normally the diagonal distance from one viewable corner to the opposite viewable corner. Bezels and stands are not included. For a useful Screen Size Calculator result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.

How do I calculate screen width and height from the diagonal?

Use the diagonal and aspect-ratio components with the Pythagorean theorem. The calculator performs those steps and displays both dimensions. For a useful Screen Size Calculator result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.

Does a 55-inch TV measure 55 inches wide?

No. The 55-inch label describes the diagonal. A 16:9 55-inch screen is about 47.94 inches wide and 26.96 inches high. For a useful Screen Size Calculator result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.

What is PPI?

Pixels per inch is the diagonal pixel count divided by the physical diagonal in inches. A higher PPI places more pixels in each physical inch. Use realistic inputs and review the Screen Size Calculator assumptions before relying on this result for decisions.

What is pixel pitch?

Pixel pitch is the physical distance from one pixel position to the next. This calculator reports an approximate pitch in millimeters as 25.4 divided by PPI. Use realistic inputs and review the Screen Size Calculator assumptions before relying on this result for decisions.

Can I use a custom aspect ratio?

Yes. Select Custom ratio and enter positive width and height ratio components, such as 32 and 9. For a useful Screen Size Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.

Why might the resolution and physical aspect ratios differ?

Some displays use cropped active areas, rounded specifications, or pixel layouts that do not map perfectly to the entered physical ratio. Recheck the manufacturer specifications when the calculator shows a mismatch warning. Review the Screen Size Calculator assumptions before relying on this result for decisions.

One Useful Fact About Equal Diagonals

For the same diagonal, a squarer aspect ratio has more viewable area than a wider one. A 4:3 and 16:9 screen can share the same diagonal while having different widths, heights, and surface areas.

Conclusion

Use the viewable diagonal, physical aspect ratio, and native panel resolution. The calculator handles the geometry and density arithmetic, while manufacturer dimensions remain necessary for furniture, mounting, and enclosure decisions.

References

These references support the calculation method, assumptions, or current program guidance.

Corrections and Review

Report an issue or error in the calculator using the Contact Us page.