Screen Size Calculator Examples

Compare worked examples for a 55-inch 4K TV, 27-inch QHD monitor, 34-inch ultrawide, exact 4:3 display, and centimeter input.

How should you use these Screen Size Calculator examples?

These examples turn the Screen Size Calculator inputs into complete scenarios with stated values, calculation steps, and interpreted results. Use them to check how the calculator behaves, compare your own situation with realistic cases, and identify which inputs have the greatest effect before relying on an estimate.

Example 1: 55-Inch 16:9 4K TV

For a 55-inch diagonal, 16:9 physical ratio, and 3840 × 2160 pixels:

W=55\frac{16}{\sqrt{16^2+9^2}}=47.94\text{ in}

H=55\frac{9}{\sqrt{16^2+9^2}}=26.96\text{ in}

The viewable area is 1,292.58 in², density is 80.11 PPI, and approximate pixel pitch is 0.317 mm.

Example 2: 27-Inch 16:9 QHD Monitor

A 27-inch 2560 × 1440 display calculates to 23.53 inches wide and 13.24 inches high. It has approximately 108.79 PPI and 0.233 mm pixel pitch.

Example 3: 34-Inch 21:9 Ultrawide

Using the entered 21:9 physical ratio, the screen is 31.25 inches wide and 13.39 inches high. At 3440 × 1440 pixels, it reports approximately 109.68 PPI. Enter a manufacturer's more exact physical ratio when available.

Example 4: Exact 10-Inch 4:3 Display

The 4:3 ratio forms a 3-4-5 triangle. A 10-inch diagonal therefore gives exactly 8 inches of width, 6 inches of height, and 48 in². With 1024 × 768 pixels, diagonal pixels equal 1280 and density equals 128 PPI.

Example 5: Enter the Same 27-Inch Screen in Centimeters

Multiply 27 inches by 2.54 to get 68.58 centimeters. Entering 68.58 cm with a 16:9 ratio produces the same physical screen: approximately 59.77 cm wide and 33.62 cm high.

Compare the Screen Examples

Screen	Physical ratio	Width × height	Resolution	PPI
55-inch TV	16:9	47.94 × 26.96 in	3840 × 2160	80.11
27-inch monitor	16:9	23.53 × 13.24 in	2560 × 1440	108.79
34-inch ultrawide	21:9	31.25 × 13.39 in	3440 × 1440	109.68
10-inch display	4:3	8 × 6 in	1024 × 768	128
68.58 cm screen	16:9	59.77 × 33.62 cm	Not entered	-

Reproduce a Screen Example

Open the Screen Size Calculator.
Enter the diagonal and select its unit.
Select or enter the physical aspect ratio.
Enter both native resolution values when the example includes PPI.
Select Calculate and compare the dimensions, metrics, diagram table, and warnings.

References

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

OpenStax - Right Triangle Trigonometry
General mathematics. Effective: Current open textbook edition. Verified: 2026-08-24.
National Institute of Standards and Technology - NIST Guide to the SI, Appendix B.9: Conversion Factors
United States. Effective: Current NIST conversion table. Verified: 2026-08-24.

Corrections and Review

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

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