Question 1

How many rem is 20px?

Accepted Answer

20px = 1.25rem (at 16px root font size). Divide the pixel value by the root font size: 20 ÷ 16 = 1.25.

Question 2

Why should I use rem instead of px for 20px?

Accepted Answer

Using 1.25rem instead of 20px allows the text to scale with the user's browser font size preference. rem units are relative to the root element's font size, making your design more accessible.

Question 3

What is 20px in rem at a 10px base font size?

Accepted Answer

At a 10px base (common technique: html { font-size: 62.5%; }), 20px = 2rem. Using 62.5% base makes rem calculations simple: 1rem = 10px.

Question 4

What is 1.25rem converted back to px?

Accepted Answer

1.25rem × 16px (root font size) = 20px. To convert rem back to px, multiply the rem value by the root font size.

20px to rem — 1.25rem (at 16px base)

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