How does the Screen Size Calculator work?

Width = Diagonal × cos(arctan(height_ratio / width_ratio)) Then: Height = Diagonal × sin(arctan(height_ratio / width_ratio)) Then: For 16:9: Width = Diagonal × 0.8721, Height = Diagonal × 0.4906 Then: Area = Width × Height.

Can you give an example of how to use the Screen Size Calculator?

Example: Input 55" TV at 16:9 gives a result of Width: 47.96" (122cm) × Height: 27.0" (68.6cm) (Area: 1,295 in² = 83,571 cm²).

Is the Screen Size Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Screen Size Calculator?

Our Screen Size Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Screen Size Calculator

Diagonal size (inches)"

Aspect ratio

A screen size calculator converts a display's diagonal size (how screens are marketed) into actual width and height dimensions using the aspect ratio. The stated diagonal is the corner-to-corner measurement — a 55-inch TV is not 55 inches wide.

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Pro Tip

For TV size recommendations: sitting distance (cm) ÷ 2.5 = ideal screen diagonal in cm. A 3m viewing distance suggests a 120cm (47") minimum screen.

References

›DisplaySpecifications Database
›RTINGS — Display Technology Explained

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