CSS Units Converter
What is a CSS Units Converter?
Convert CSS sizing units between pixels (`px`), root ems (`rem`), ems (`em`), points (`pt`), and percentages (`%`) relative to a configurable base font size (default `16px`).
Why Use This Tool?
- Responsive Web Design: Convert fixed pixel values from Figma/Adobe XD designs into accessible, scalable `rem` units.
- Typography Styling: Calculate exact `rem` and `em` values for font sizes, padding, and margins.
- Print CSS Styling: Convert screen pixel measurements to print point (`pt`) sizes.
How to Use
- Set your Base Root Font Size (default is `16px`).
- Enter a value in any field (e.g. `24px` or `1.5rem`).
- View simultaneous conversions across PX, REM, EM, PT, and %.
Real Working Example
Input:
Value: 24px | Base Root: 16px
Output Result:
REM: 1.5rem | EM: 1.5em | Points: 18pt | Percent: 150%
Important Technical Details & Features
- Bi-Directional Calculation: Editing any unit updates all other units automatically in real time.
- Custom Base Font Size: Configure base font size (e.g. 16px, 14px, or 10px 62.5% trick).
- Local Browser Processing: Instant calculation without page reload.
Related Web & SEO Tools
- CSS clamp() Calculator: Compute fluid responsive CSS clamp values.
- DPI / PPI Calculator: Calculate screen pixel density.
- CSS Units Converter: Convert PX, REM, EM.
Frequently Asked Questions
Why should I use REM instead of PX in CSS?
REM units scale with the user's browser font size preferences, improving web accessibility for visually impaired users.
What is the default browser base font size?
The standard default browser root font size is 16px (1rem = 16px).
Can I change the base font size to 10px?
Yes, change the base root size setting to 10px if using the 62.5% CSS font reset.
Is it free?
Yes, 100% free.
What is the main function of CSS Units Converter?
Convert CSS font and layout units between PX, REM, EM, PT, and Percent against a configurable root font size. This converter transforms css units data formats locally without server uploads.