CH to CM Converter - Free CSS Tool 2025

Conversion Form

Enter value in CH

Base Value

About the Unit

CH: The ch unit is a relative typographic unit based on the width of the '0' character of the current font. This unit is especially useful when you want the width of an element to be proportional to the text content, particularly for input fields or text areas. Using ch ensures that the element size adjusts based on the average character width of the current font, providing precise control over text layout. For example, if you set the width of a text input field to 10ch, it will be wide enough to accommodate 10 '0' characters of the font, making it useful for password fields or numeric inputs. The ch unit is less commonly used than other relative units like em or rem, but it is an excellent choice when precise width based on textual content is needed.

Pro Tip: ch → cm

Use ch for text width, cm for physical print-based measurements.

Quick Reference: Unit Conversion by Tens

CH	CM
10ch	2.116667cm
20ch	4.233333cm
30ch	6.35cm
40ch	8.466667cm
50ch	10.583333cm
60ch	12.7cm
70ch	14.816667cm
80ch	16.933333cm
90ch	19.05cm
100ch	21.166667cm
110ch	23.283333cm
120ch	25.4cm
130ch	27.516667cm
140ch	29.633333cm
150ch	31.75cm
160ch	33.866667cm
170ch	35.983333cm
180ch	38.1cm
190ch	40.216667cm
200ch	42.333333cm
210ch	44.45cm
220ch	46.566667cm
230ch	48.683333cm
240ch	50.8cm
250ch	52.916667cm

Live Unit Preview

See how different CSS units affect the size of the box below:

10px

10rem

10em

10%

10vw

10vh

Common Mistake

Be cautious when mixing ch and cm without testing on different screen sizes.

Real Code Example

/* Mobile-first card with ch → cm */
.card {
  padding: 0ch;     /* undefinedcm */
  font-size: 1.5rem;
  width: min(90vw, 40ch);
}

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Keyboard Shortcuts

Ctrl + C: Convert
Ctrl + I: Invert units
Esc: Reset values

CH → CM Converter