About This Site

Design specs come in pixels. Your CSS needs REM. And every time you pause to calculate “24 divided by 16,” you break your flow.

It gets worse when projects use non-standard root font-sizes—or when EM units compound through nested elements. Mental math becomes a productivity killer.

That’s why we built PX2REM.com.

Enter a value, pick your base font-size, get instant results. Bidirectional conversion between px, rem, and em. A reference table for quick lookups. No sign-ups, no downloads—just fast answers in your browser.

Stay in flow. Ship code faster.