AkousaConverter
CSS Unit Converter
Convert between CSS units: px, rem, em, pt, cm, mm, and in.
Base Font Size (px)
px
px
px
px
pxPixels
remRoot em
emEm (parent-relative)
%Percentage (parent-relative)
vwViewport width
vhViewport height
ptPoints (1pt = 1/72in)
pcPicas (1pc = 12pt)
cmCentimeters
mmMillimeters
inInches
Common Breakpoints
| Name | px | rem |
|---|---|---|
| sm | 640px | 40rem |
| md | 768px | 48rem |
| lg | 1024px | 64rem |
| xl | 1280px | 80rem |
| 2xl | 1536px | 96rem |
About CSS Unit Converter
CSS supports multiple units for sizing elements, fonts, and spacing. Pixels (px) are absolute units, while rem and em are relative to font size — making them essential for responsive design. This tool converts between all common CSS units instantly, with an adjustable base font size for accurate rem/em calculations.
How to Use
Select your source unit from the buttons at the top, then enter a numeric value. All conversions are shown instantly. Adjust the base font size (default 16px) if your project uses a different root font size. Click the copy icon next to any result to copy it.
Common Use Cases
- Converting pixel values to rem for responsive typography
- Translating print units (pt, cm, mm) to screen units (px)
- Calculating em values relative to a custom base font size
- Generating consistent spacing values across different unit systems
- Converting design specs from inches or points to pixels
Frequently Asked Questions About CSS Unit Converter
What is CSS Unit Converter?
CSS Unit Converter is a free online tool on akousa.net, a platform with 559+ browser-based utilities. Convert between CSS units: px, rem, em, pt, cm, mm, and in. No installation is required.
How do I use CSS Unit Converter?
Simply open CSS Unit Converter on akousa.net, enter or upload your data, configure any options, and click the action button. Results appear instantly in your browser.
Is CSS Unit Converter free?
Yes, the core CSS Unit Converter experience is free to use without signup. All 559+ tools remain available for everyday use, while Akousa Pro adds optional premium platform features and ad-free browsing.