Question 1

How do I convert px to rem?

Accepted Answer

Divide the px value by the base font-size (usually 16px). For example, 32px ÷ 16 = 2rem.

Question 2

What is the default base font-size for rem?

Accepted Answer

Most browsers use 16px as the default root font-size. Our tool lets you customize this value.

Question 3

What is the difference between rem and em?

Accepted Answer

rem is relative to the root (html) font-size, while em is relative to the parent element's font-size.

Question 4

How does vw unit work?

Accepted Answer

vw stands for viewport width. 1vw = 1% of the viewport width. It's useful for responsive design.

Question 5

Can I use this converter for responsive design?

Accepted Answer

Yes! Converting px to rem, em, or vw units is a common practice for building responsive layouts.

Question 6

Should I use rem or em for spacing?

Accepted Answer

rem is more predictable since it's based on the root font-size. Use em when you want spacing to scale with the parent's font-size.

Question 7

What is vh in CSS?

Accepted Answer

vh stands for viewport height. 1vh = 1% of the viewport height. Useful for full-screen layouts.

Question 8

Is this tool free?

Accepted Answer

Yes, this CSS unit converter is completely free with no registration required.

CSS Unit Converter