# Convert REM to EM

> Convert rem to em online. Free REM to EM converter with a worked example and a live calculator — understand how the two relative units line up.

Rem and em resolve to the same pixel size when an element's font size equals the root, but they diverge the moment font sizes are overridden. This converter shows the equivalent em for a rem value at a shared base, and the live tool lets you compare all three units side by side.

## Example: REM → EM

Input:
```
0.5rem
1rem
1.5rem
2rem
```

Output:
```
0.5em
1em
1.5em
2em
```

## How to convert REM to EM

1. Start with your rem value, which is relative to the root font size.
2. At a matching base font size, the numeric em value is identical.
3. If a parent element changes the font size, recompute em against that size.

## FAQ

### Is 1rem always equal to 1em?

Only when the element's font size equals the root font size. Because em is relative to the current element and rem to the root, they drift apart inside resized or nested elements.

### Which should I prefer?

Use rem for predictable global sizing and em when you want a value to scale with a specific element's own font size.

## Related converters

- [EM → REM](https://www.devkult.com/convert/em-to-rem.md)
- [PX → REM](https://www.devkult.com/convert/px-to-rem.md)
- [PX → EM](https://www.devkult.com/convert/px-to-em.md)

Open the interactive converter: https://www.devkult.com/convert/rem-to-em