CSS Units Converter
CSS Units Converter
How to Use the CSS Units Converter:
Enter a CSS value with its unit (e.g., 16px, 1.5em, 2rem) in the input field. Select the base font size (default 16px) and viewport dimensions if converting viewport units. Choose your target unit and click Convert. The tool will instantly display the converted value in all supported units.
- Responsive Design
Convert between px, em, rem, and viewport units when building responsive WordPress themes and layouts.
- Theme Development
Convert CSS units to maintain consistent sizing across different screen sizes and devices in WordPress themes.
- CSS Calculations
Quickly convert between units when calculating font sizes, spacing, and dimensions in CSS stylesheets.
How Do CSS Units Work?
CSS units can be absolute (px) or relative (em, rem, %, vw, vh). Relative units depend on parent elements, root font size, or viewport dimensions. The converter calculates conversions based on these relationships.
- Absolute Units (px)Pixels are fixed-size units that don't change based on other elements. One pixel equals one device pixel on the screen.
- Relative Units (em, rem)em is relative to the parent element's font size, while rem is relative to the root (html) element's font size. Both scale proportionally.
- Viewport Units (vw, vh)Viewport width (vw) and height (vh) units are relative to the browser viewport size. 1vw = 1% of viewport width, 1vh = 1% of viewport height.
- Percentage Units (%)Percentage units are relative to the parent element's size for the same property, making them useful for responsive layouts.
Using CSS Units in Development:
/* Base font size: 16px */
html { font-size: 16px; }
/* 1.5em = 24px (relative to parent) */
.parent { font-size: 1.5em; }
/* 2rem = 32px (relative to root) */
.child { font-size: 2rem; }Parent: 24px, Child: 32pxCollect Better Feedback with Userback
Frequently Asked Questions
What is the difference between em and rem?
em is relative to the parent element’s font size, while rem is relative to the root (html) element’s font size. rem is generally preferred for predictable sizing.
How do viewport units work?
vw (viewport width) and vh (viewport height) are relative to the browser window size. 1vw = 1% of viewport width, useful for responsive designs.
What base font size should I use?
The default base font size is 16px, which is the browser default. You can adjust this in the converter to match your theme’s root font size.
