REM to PX Converter

About

REM to PX Converter — the developer's toolbar shortcut for instant CSS unit conversion.
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Stop switching tabs or doing mental math. Click the icon, type a REM value, and instantly see the pixel result — right from your Chrome toolbar.

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⚡ WHAT IT DOES
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Type any REM value (like 1.5, 2.25, or 0.875) and the extension immediately shows you the exact pixel equivalent based on your configured root font size.

The default root font size is 16px — matching the browser default — but you can adjust it to match your project's actual root font size. Your setting is saved automatically between sessions.

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🛠 FEATURES
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✦ Real-time conversion — result updates instantly as you type
✦ Configurable root font size — set your project's actual base (e.g. 14px, 16px, 18px)
✦ Saved preference — your root font size is remembered between browser sessions
✦ Quick-pick buttons — tap common values like 0.5, 1, 1.5, 2rem without typing
✦ Reference table — 20 pre-calculated REM/PX pairs for quick scanning
✦ One-click copy — copy the pixel result to clipboard instantly
✦ Formula display — always shows the live calculation so you understand the math
✦ Works offline — no internet connection required, ever

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🎯 WHO IS THIS FOR?
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→ Frontend developers working with rem-based design systems
→ CSS engineers converting Figma/Sketch px values to rem
→ Developers building or auditing accessible, scalable typography
→ Anyone tired of opening a calculator just to convert a unit

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🔒 PRIVACY — ZERO DATA COLLECTION
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This extension collects absolutely nothing.

• No analytics
• No tracking
• No network requests of any kind
• No ads — ever

The only permission requested is "storage" — used exclusively to remember your preferred root font size between sessions. That value never leaves your device.

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📐 HOW REM → PX WORKS
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REM (Root EM) is a CSS unit relative to the root element's font size. The formula is simple:

  px = rem × root font size

For example, with a 16px base:
  • 1rem   = 16px
  • 1.5rem = 24px
  • 0.875rem = 14px

This extension does that math instantly, with any base you choose.

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💡 TIPS
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• Working on a project where the root font is 10px (common in "62.5% trick" codebases)? Set the base to 10 and every conversion will be accurate for your project.
• Use the quick-pick buttons for the most common values without typing.
• The reference table is great for a quick scan without entering anything.
• Click the copy button to paste the result directly into your CSS.

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🌐 ABOUT
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Built and maintained by remtopxonline.com — a tools-for-developers initiative. 

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If you find this useful, please leave a rating — it helps other developers discover the tool. Feedback and suggestions are always welcome via the support link below.

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