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15px to rem

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

15px=0.9375rem

15 ÷ 16 = 0.9375 — rem is just pixels divided by the root font size, which defaults to 16px.

root size15px in rem
14px1.0714rem
16px0.9375rem
18px0.8333rem
20px0.75rem

Different value? Use the converter.