Fixed pixel values don't scale with user preferences. When a user sets their browser font size to 20px for accessibility, your 16px text stays stubbornly small. REM units respect these preferences, making your site more accessible and responsive with minimal effort.
What Is PX to REM?
REM (root em) is relative to the root font size (typically 16px). So 1rem = 16px, 0.5rem = 8px, 2rem = 32px. Our PX to REM converter translates pixel values to rem with any configurable base font size.
How to Use PX to REM on DevToolHub
- Open the PX to REM tool on DevToolHub — no signup required.
- Paste or enter your input data in the left panel.
- See the result instantly in the output panel.
- Copy the result or download it as a file.
Common PX to REM Values
Quick reference at 16px base (default):
// At base font-size: 16px (browser default)
8px = 0.5rem
12px = 0.75rem
14px = 0.875rem
16px = 1rem (base)
18px = 1.125rem
20px = 1.25rem
24px = 1.5rem
32px = 2rem
48px = 3rem
64px = 4rem
// CSS usage
.title {
font-size: 2rem; /* 32px at default, scales with user preference */
margin-bottom: 1.5rem; /* 24px at default */
padding: 1rem 2rem; /* 16px 32px at default */
}Pro Tips
- Use rem for font sizes and spacing — they scale with user font preferences
- Use px for borders, box-shadows, and small fixed elements that shouldn't scale
- Set a base font-size on html — some teams use 62.5% (10px base) for easier math: 1.6rem = 16px
- Mix units intentionally: rem for content scaling, px for decorative elements, vh/vw for layout
When You Need This
- Converting pixel-based designs to accessible rem values
- Building responsive typography systems
- Implementing design tokens with scalable spacing
- Making existing sites accessible by replacing px with rem
Free Tools Mentioned in This Article