PX to REM Calculator
Convert pixel values to REM units for responsive CSS. Set your project's base font size and get accurate REM equivalents instantly.
Most current tools process data directly in your browser. If a tool requires external processing, it will say so clearly.
How to Convert PX to REM
- 1Enter your pixel value in the PX input field
- 2Set the base font size (default is 16px for most browsers)
- 3The REM value is calculated automatically
- 4Use the table to see common pixel values converted to REM
Key Benefits
- Instant conversion with custom base font size
- Handy conversion table for common values
- Bidirectional: PX to REM and REM to PX
- Essential for accessible, responsive CSS
Frequently Asked Questions
What is the difference between PX and REM?
PX (pixels) are fixed-size units. REM (root em) is relative to the root element's font size (usually 16px). Using REM allows users to scale the entire layout by adjusting their browser font size.
Why is 16px the default base?
Most browsers set the default font size to 16px. So 1rem = 16px by default. If your project sets a different root font size, update the base in this calculator.
Should I use REM or EM?
REM is relative to the root element, making it more predictable. EM is relative to the parent element, which can compound. REM is generally preferred for font sizes and spacing.