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. Paste font-size: 0.625rem; into your CSS so typography scales when users change their browser default 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 }. If your root differs, scale with rem = 10 ÷ yourRootPx before shipping production styles.
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. Prefer rem for layout rhythm so zoom and OS font settings do not clip text.
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. Use that when a design tool exports rem tokens and you need pixel sizes for image assets, canvas drawing, or developer handoff docs.
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 covering font-size, padding, and gap so you can pick a consistent token across components and breakpoints.
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PX to REM cheat sheet - 12px through 64px