Screen Size Converter Inches to CM

Screen size converter inches to cm diagonal calculator — convert TV and monitor sizes. Use the free Screen Size Converter Inches to CM below — enter your values and get instant results, right in your browser. cm = inches × 2.54 exactly. mm = inches × 25.4. The advertised size is the diagonal; for a 16:9 screen, width ≈ diagonal × 0.8716 and height ≈ diagonal × 0.4903.

How to use the Screen Size Converter Inches to CM

TVs and monitors are sold by their diagonal screen size in inches — but many shoppers think in centimeters, and product listings mix both. This screen size converter inches to cm diagonal calculator converts instantly either way, so a "55-inch TV" becomes a concrete 139.7 cm diagonal you can measure against your wall. Remember: the number is the diagonal, not the width — the actual TV is always narrower.

  1. Type the screen size into the amount field.
  2. Set From to Inches and To to Centimeters (or reverse it).
  3. Read the converted diagonal instantly — it updates live.
  4. Use the swap button to flip the conversion direction.
  5. Measure your wall or desk against the cm figure before buying.

Formula

cm = inches × 2.54 exactly. mm = inches × 25.4. The advertised size is the diagonal; for a 16:9 screen, width ≈ diagonal × 0.8716 and height ≈ diagonal × 0.4903.

Worked example

Eyeing a 55-inch TV? Type 55, inches → cm: 139.70 cm diagonal. Its 16:9 width is about 121.7 cm — now measure your TV wall to confirm it fits with room for the stand. Remember the advertised inches measure the diagonal only, so width is always smaller than the number suggests.

Frequently asked questions

Always the diagonal, corner to corner. A 55-inch TV is about 122 cm wide, not 140 cm.

81.28 cm diagonal (32 × 2.54). Its width is roughly 70.8 cm on a 16:9 panel.

No — the advertised inches measure only the display panel. Add 2–5 cm for bezels when planning wall space.

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