CM → REM Converter
Converting from CM to REM is common when switching from mainly for print precision or physical measurements. to useful for typography scaling and accessibility. in CSS projects.
Conversion Form
About the Unit
Centimeter (cm): The centimeter (cm) is a metric physical unit, equivalent to 1/100 of a meter. In CSS, the cm unit is primarily used for print design, as it allows specifying exact physical dimensions for layouts that will be printed or exported to physical formats, like PDF. Using cm ensures that the layout elements will have the exact desired size when printed, regardless of screen resolution or device size. 1cm is approximately equal to 37.795px on a 96 DPI screen, making it useful when precise print measurements are needed, but less practical for digital web design, where relative units like px or em are more flexible.
Pro Tip: cm → rem
Use cm for physical print layouts and rem for scalable typography.
Quick Reference: Unit Conversion by Tens
| CM | REM |
|---|---|
| 10cm | 3.937008rem |
| 20cm | 7.874016rem |
| 30cm | 11.811024rem |
| 40cm | 15.748031rem |
| 50cm | 19.685039rem |
| 60cm | 23.622047rem |
| 70cm | 27.559055rem |
| 80cm | 31.496063rem |
| 90cm | 35.433071rem |
| 100cm | 39.370079rem |
| 110cm | 43.307087rem |
| 120cm | 47.244094rem |
| 130cm | 51.181102rem |
| 140cm | 55.11811rem |
| 150cm | 59.055118rem |
| 160cm | 62.992126rem |
| 170cm | 66.929134rem |
| 180cm | 70.866142rem |
| 190cm | 74.80315rem |
| 200cm | 78.740157rem |
| 210cm | 82.677165rem |
| 220cm | 86.614173rem |
| 230cm | 90.551181rem |
| 240cm | 94.488189rem |
| 250cm | 98.425197rem |
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 cm and rem without testing on different screen sizes.
Real Code Example
/* Mobile-first card with cm → rem */
.card {
padding: 0cm; /* undefinedrem */
font-size: 1.5rem;
width: min(90vw, 40ch);
}Frequently Asked Questions About CM
When should I use cm instead of cm?
Use cm for print layouts or physical dimensions.
How many cm is 1cm?
1cm = 37.8px approximately.
Is cm affected by screen size?
No, it's a fixed physical measurement.
Is cm good for web design?
Not typically, better for print styles.
Keyboard Shortcuts
- Ctrl + C: Convert
- Ctrl + I: Invert units
- Esc: Reset values