20px → REM

20px to REM — 1.25rem at 16px Base

At the default browser root size of 16px, 20px equals 1.25rem. Formula: rem = px ÷ 16.

Last reviewed: June 28, 2026

CSS snippet

.example {
  font-size: 1.25rem; /* 20px at 16px root */
  padding: 1.25rem;
}

PX to REM formula

rem = px ÷ root font size

20px ÷ 16px = 1.25rem

Worked example: To convert 20px at a 16px root, divide 20 by 16. 20 ÷ 16 = 1.25. Write font-size: 1.25rem; instead of font-size: 20px; so text scales when users enlarge their browser default font size.

Common use cases at 20px (1.25rem)

Category	Tailwind / design use	CSS property example
Font size	text-xl (1.25rem)	`font-size: 1.25rem;`
Spacing	—	`padding: 1.25rem;`
Gap / margin	—	`gap: 1.25rem;`

  
Nearby pixel conversions
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Also see  18px to rem
 
and  24px to rem
.
 
 
 20px to REM FAQ
How do you convert 20px to rem?
Divide 20 by the root font size. At the default 16px base: 20 ÷ 16 = 1.25rem. Formula: rem = px ÷ root font size.
What is 20px in rem at 16px base?
At a 16px root font size, 20px equals exactly 1.25rem. This is the browser default unless your project or the user changes html { font-size }.
Should I use 1.25rem or 20px in CSS?
Use 1.25rem for typography and spacing that should scale with the user's root font-size preference — important for accessibility. Reserve 20px for fixed values like 1px borders or bitmap image dimensions.
How do I convert 1.25rem back to pixels?
Multiply 1.25rem by 16: 1.25 × 16 = 20px. Reverse formula: px = rem × root font size.
Where is 20px commonly used in web design?
20px (1.25rem) maps to text-xl (1.25rem) 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