px to rem
Convert pixels and rem at a chosen root size.
Loading tool
Default root is 16px. Change it if your html font-size is different, then convert a list of spacing tokens.
How to use this tool
- Enter the source value. Type the number, color, or timestamp you want to convert.
- Pick the target unit. Choose the output system. Conversion runs locally.
- Copy the converted value. Use Copy when you need the result elsewhere.
Lists
Paste several pixel values, one per line, to get a rem column you can drop into a theme file.
Frequently asked
Should I convert 1px borders to rem?
Hairlines often stay in px so they do not vanish at odd roots.
What about em?
This page is rem against the root. em depends on the parent and is not converted here.
Can I use 62.5% root?
Set root to 10px and the math matches that trick.
Are viewport units included?
No. Use the unit converter for physical units, not vw.
Does this change my CSS file?
It only prints numbers. Paste them where you need them.