Nexus

REM to MM Converter

Conversion Table

Root Em Millimeters
0.01rem 0.042mm
0.03rem 0.127mm
0.05rem 0.21mm
0.08rem 0.338mm
0.1rem 0.42mm
0.15rem 0.635mm
0.2rem 0.845mm
0.5rem 2.117mm
0.625rem 2.646mm
0.75rem 3.175mm
0.875rem 3.704mm
1rem 4.233mm
1.125rem 4.762mm
1.25rem 5.292mm
1.375rem 5.821mm
1.5rem 6.35mm
1.625rem 6.879mm
1.75rem 7.408mm
1.875rem 7.937mm
2rem 8.467mm
2.125rem 8.996mm
2.25rem 9.525mm
2.375rem 10.054mm
2.5rem 10.583mm
2.625rem 11.112mm
2.75rem 11.641mm
2.875rem 12.17mm
3rem 12.7mm
3.125rem 13.229mm
3.25rem 13.758mm
3.375rem 14.287mm
3.5rem 14.816mm
3.625rem 15.345mm
3.75rem 15.874mm
3.875rem 16.404mm
4rem 16.933mm
5rem 21.17mm
6rem 25.4mm
8rem 33.88mm
10rem 42.33mm
15rem 63.5mm
20rem 84.67mm
30rem 127mm
40rem 169.3mm
50rem 211.7mm
60rem 254mm
80rem 338.8mm
100rem 423.3mm

Differences Between rem and mm

Root Em (rem) is a relative unit that scales according to the root element's font size, typically the HTML element. Millimeters (mm) are a metric unit of measurement commonly used in print media and physical dimensions. One millimeter is equal to 1/10 of a centimeter, making it useful for precise physical measurements.

Advantages of Using rem

Using rem units allows for better scalability and consistency across different screen sizes and resolutions. Since rem is relative to the root element's font size, adjusting the font size of the root element will proportionally scale all elements using rem units. This is particularly useful for responsive design and accessibility, as it respects user preferences for font size.

How to Convert rem to mm

To convert rem to millimeters, you need to know the root element's font size. By default, most browsers set the root font size to 16px. The formula for conversion is:

mm = rem * root font size * 0.2646

For example, to convert 2rem to millimeters, assuming the root font size is 16px:

2rem * 16px * 0.2646 = 8.467mm

Frequently Asked Questions

Why should I use rem instead of mm?

Using rem allows for more scalable and consistent layouts across different screen sizes and user settings, improving accessibility.

How do I set the root font size?

You can set the root font size using CSS on the HTML element. For example:

html {
    font-size: 16px;
}

Can I use rem for all elements?

Yes, you can use rem for most elements to ensure consistency. However, for precise physical measurements, mm might be more suitable.