10px → REM

10px to REM — 0.625rem at 16px Base

At the default browser root size of 16px, 10px equals 0.625rem. Formula: rem = px ÷ 16.

Last reviewed: June 28, 2026

CSS snippet

.example {
  font-size: 0.625rem; /* 10px at 16px root */
  padding: 0.625rem;
}

PX to REM formula

rem = px ÷ root font size

10px ÷ 16px = 0.625rem

Worked example: To convert 10px at a 16px root, divide 10 by 16. 10 ÷ 16 = 0.625. Write font-size: 0.625rem; instead of font-size: 10px; so text scales when users enlarge their browser default font size.

Common use cases at 10px (0.625rem)

Category	Tailwind / design use	CSS property example
Font size	Fine print, captions	`font-size: 0.625rem;`
Spacing	—	`padding: 0.625rem;`
Gap / margin	—	`gap: 0.625rem;`

  
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Also see  8px to rem
 
and  12px to rem
.
 
 
 10px to REM FAQ
How do you convert 10px to rem?
Divide 10 by the root font size. At the default 16px base: 10 ÷ 16 = 0.625rem. Formula: rem = px ÷ root font size.
What is 10px in rem at 16px base?
At a 16px root font size, 10px equals exactly 0.625rem. This is the browser default unless your project or the user changes html { font-size }.
Should I use 0.625rem or 10px in CSS?
Use 0.625rem for typography and spacing that should scale with the user's root font-size preference — important for accessibility. Reserve 10px for fixed values like 1px borders or bitmap image dimensions.
How do I convert 0.625rem back to pixels?
Multiply 0.625rem by 16: 0.625 × 16 = 10px. Reverse formula: px = rem × root font size.
Where is 10px commonly used in web design?
10px (0.625rem) maps to Fine print, captions in typical design systems. For Tailwind spacing, see —. Check the use-case table on this page for CSS property examples.
    Full converter
 
PX to REM Converter — any value, custom base
  
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PX to REM cheat sheet — 12px through 64px