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100px to rem

100 pixels expressed in rem, the unit that scales when a user changes their browser's font size.

100px=6.25rem

100 ÷ 16 = 6.25 — rem is just pixels divided by the root font size, which defaults to 16px.

root size100px in rem
14px7.1429rem
16px6.25rem
18px5.5556rem
20px5rem

Different value? Use the converter.