Conversion Table
Root Em | Viewport Width |
---|---|
0.01rem | 0.0083vw |
0.03rem | 0.0250vw |
0.05rem | 0.0417vw |
0.08rem | 0.0667vw |
0.1rem | 0.0833vw |
0.15rem | 0.1250vw |
0.2rem | 0.1667vw |
0.5rem | 0.4167vw |
0.625rem | 0.5208vw |
0.75rem | 0.6250vw |
0.875rem | 0.7292vw |
1rem | 0.8333vw |
1.125rem | 0.9375vw |
1.25rem | 1.0417vw |
1.375rem | 1.1458vw |
1.5rem | 1.2500vw |
1.625rem | 1.3542vw |
1.75rem | 1.4583vw |
1.875rem | 1.5625vw |
2rem | 1.6667vw |
2.125rem | 1.7708vw |
2.25rem | 1.8750vw |
2.375rem | 1.9792vw |
2.5rem | 2.0833vw |
2.625rem | 2.1875vw |
2.75rem | 2.2917vw |
2.875rem | 2.3958vw |
3rem | 2.5000vw |
3.125rem | 2.6042vw |
3.25rem | 2.7083vw |
3.375rem | 2.8125vw |
3.5rem | 2.9167vw |
3.625rem | 3.0208vw |
3.75rem | 3.1250vw |
3.875rem | 3.2292vw |
4rem | 3.3333vw |
5rem | 4.1667vw |
6rem | 5.0000vw |
8rem | 6.6667vw |
10rem | 8.3333vw |
15rem | 12.5000vw |
20rem | 16.6667vw |
30rem | 25.0000vw |
40rem | 33.3333vw |
50rem | 41.6667vw |
60rem | 50.0000vw |
80rem | 66.6667vw |
100rem | 83.3333vw |
Differences Between rem and vw
Root Em (rem) is a relative unit that scales according to the root element's font size, typically the HTML element. Viewport Width (vw) is a relative unit that scales based on the width of the viewport. One vw unit is equal to 1% of the viewport's width, making it useful for responsive design.
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 vw
To convert rem to vw, you need to know the root element's font size and the viewport width. The formula for conversion is:
vw = (rem * root font size) / (viewport width / 100)
For example, to convert 2rem to vw, assuming the root font size is 16px and the viewport width is 1000px:
2rem * 16px / (1000px / 100) = 3.2vw
Frequently Asked Questions
Why should I use rem instead of vw?
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 full-width elements that need to scale with the viewport width, vw might be more suitable.