Pixel Converter

REM to PX Converter

Convert rem to pixels using the root font-size. Multiply the rem value by the root size to get an absolute pixel value.

All converters

Parent/root font-size the relative unit is measured against.

Result

256px

Formula

px = rem × root font-size (default 16px)

Conversion table

rem → px at base font-size (px) = 16.

rempx
0.25rem4px
0.5rem8px
0.75rem12px
1rem16px
1.25rem20px
1.5rem24px
2rem32px
2.5rem40px
3rem48px
4rem64px
5rem80px
6rem96px
8rem128px
10rem160px

About the REM to PX conversion

rem is relative to the root <html> font-size. Converting rem to px resolves that relative value into a fixed pixel measurement — useful for specs, debugging, and contexts that need absolute sizes.

The formula is px = rem × root font-size. At the 16px default, 1rem is 16px, 1.5rem is 24px, and 0.5rem is 8px. Change the base to match your document’s root font-size.

Reach for this rem to px converter when translating a rem-based design token into a concrete pixel value, or when checking exactly how large a rem value will render.

Related converters

px to emem to pxpx to rempx to ptpt to pxpx to vh

REM to PX Converter FAQs

Multiply the rem value by the root font-size. At the default 16px root, px = rem × 16 — so 1rem = 16px and 2rem = 32px.
Only when the root font-size is 16px (the browser default). If html { font-size } is set to another value, 1rem equals that value instead.
When you need an absolute size — for a fixed-width asset, a spec that requires pixels, or debugging why a rem value renders at a certain size.
No. rem is always relative to the root font-size regardless of nesting, so the conversion depends only on the root value — not on parent elements.