REM to EM Converter
Use this free online rem to em converter tool to convert root-relative units to parent-relative units. While both are scalable CSS units, REM is based on the root element while EM is based on the parent element. This converter helps you switch between these two relative unit systems.
To convert rem to em, multiply the rem value by the root font-size and divide by the parent font-size. In most cases with matching font sizes, the values are equal. However, if parent and root sizes differ, the calculation adjusts accordingly.
Conversion Formula
em = (rem × root font-size) ÷ parent font-size
For example, with a root font-size of 16px and parent font-size of 16px, 2rem equals 2em. If the parent font-size is 32px, then 2rem equals 1em because (2 × 16) ÷ 32 = 1.
REM to EM Converter Conversion Table (Font Size: 16px)
| REM | EM |
|---|---|
| 0.0625rem | 0.0625em |
| 0.25rem | 0.25em |
| 0.5rem | 0.5em |
| 0.75rem | 0.75em |
| 1rem | 1em |
| 1.25rem | 1.25em |
| 1.5rem | 1.5em |
| 2rem | 2em |
| 2.5rem | 2.5em |
| 3rem | 3em |
| 4rem | 4em |
| 6rem | 6em |
| 8rem | 8em |
| 10rem | 10em |
| 11rem | 11em |
| 12rem | 12em |
| 13rem | 13em |
| 14rem | 14em |
| 16rem | 16em |
| 20rem | 20em |
| 30rem | 30em |
| 36rem | 36em |
| 48rem | 48em |
| 50rem | 50em |
| 60rem | 60em |
| 62rem | 62em |
| 64rem | 64em |
| 70rem | 70em |
| 75rem | 75em |
| 80rem | 80em |
| 90rem | 90em |
| 100rem | 100em |
| 120rem | 120em |
What is REM?
REM (Root EM) is a relative CSS unit based on the root element's font size, typically 16px by default in most browsers. Unlike EM units which cascade based on parent elements, REM provides consistent sizing throughout the document. This makes REM ideal for creating scalable, accessible designs that respect user font-size preferences.
What is EM?
EM is a relative CSS unit that scales based on the parent element's font size, making it highly context-dependent. By default, 1em equals the parent element's font-size value, creating a cascading effect through nested elements. While EM offers flexibility for component-level scaling, its cascading nature can make it unpredictable compared to REM in complex layouts.