48px → REM

48px to REM — 3rem at 16px Base

At the default browser root size of 16px, 48px equals 3rem. Formula: rem = px ÷ 16.

Last reviewed: June 28, 2026

CSS snippet

.example {
  font-size: 3rem; /* 48px at 16px root */
  padding: 3rem;
}

PX to REM formula

rem = px ÷ root font size

48px ÷ 16px = 3rem

Worked example: To convert 48px at a 16px root, divide 48 by 16. 48 ÷ 16 = 3. Write font-size: 3rem; instead of font-size: 48px; so text scales when users enlarge their browser default font size.

Common use cases at 48px (3rem)

Category	Tailwind / design use	CSS property example
Font size	text-5xl (3rem)	`font-size: 3rem;`
Spacing	—	`padding: 3rem;`
Gap / margin	—	`gap: 3rem;`

  
Nearby pixel conversions
    8px
 
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  48px
 
  50px
 
 
  
Also see  40px to rem
 
and  50px to rem
.
 
 
 48px to REM FAQ
How do you convert 48px to rem?
Divide 48 by the root font size. At the default 16px base: 48 ÷ 16 = 3rem. Formula: rem = px ÷ root font size.
What is 48px in rem at 16px base?
At a 16px root font size, 48px equals exactly 3rem. This is the browser default unless your project or the user changes html { font-size }.
Should I use 3rem or 48px in CSS?
Use 3rem for typography and spacing that should scale with the user's root font-size preference — important for accessibility. Reserve 48px for fixed values like 1px borders or bitmap image dimensions.
How do I convert 3rem back to pixels?
Multiply 3rem by 16: 3 × 16 = 48px. Reverse formula: px = rem × root font size.
Where is 48px commonly used in web design?
48px (3rem) maps to text-5xl (3rem) in typical design systems. For Tailwind spacing, see —. Check the use-case table on this page for CSS property examples.
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