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REM to PX Converter - Online Root EM Unit Calculator

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REM ↔ PX Converter

Online Root EM Calculator – Instant, flexible, and accurate.

Formula: px = rem Ă— base font-size
px
rem
px
Real‑time conversion as you type. Base font size: 16px

Frequently Asked Questions

REM stands for Root EM. It is a CSS unit that represents a value relative to the font‑size of the root element (the <html> tag). For example, 1rem equals the base font size of the document.

Multiply the rem value by the root font‑size in pixels. The formula is: px = rem × base font‑size (px). Our tool does this instantly – just enter a number in the REM field.

Most browsers set the default root font size to 16px. That’s why 1rem = 16px unless you explicitly change it in your CSS.

REM scales with the user’s preferred font size (browser settings), improving accessibility. It also simplifies responsive typography because you can adjust the entire layout by changing only the root font size in media queries.

REM is always relative to the root element, while EM is relative to the font size of its own parent element. This makes REM more predictable in nested structures.

Yes. Define html { font-size: 20px; } (or any value) in your CSS. Many designers use 62.5% (which makes 1rem = 10px) for easier mental math.

Yes, REM is fully supported in all modern browsers including Chrome, Firefox, Safari, and Edge. It even works in Internet Explorer 9 and above.
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