PX to REM Converter & Conversion Tables [Online Calculator]

Q: How do I convert PX to REM in CSS?

To convert PX to REM, divide the pixel value by the root font size (usually 16px ). Example: 16px ÷ 16 = 1rem

Q: What is the default REM base size in CSS?

Most browsers use a default root font size of 16px , meaning 1rem = 16px unless otherwise defined.

Easily convert pixels (PX) to REM with this free online CSS unit converter. Ideal for web designers, developers, and digital creators, this calculator ensures precise scaling for responsive web designs and typography control.

✅ Perfect for scaling typography, spacing, and layout designs in CSS.
✅ Designed to streamline your workflow for fluid and consistent web designs.

Start Converting Now →

PX to REM Conversion Calculator

PX to REM Converter

Enter your pixel value below to instantly convert it to REM.

Pixel (PX): REM Value:

Input Field → Enter Pixel (PX) Value
Convert Button → Instantly Calculate REM Value
Copy Button → One-click copy for easy use in CSS code
Reset Button → Clear your inputs with one click

Example Calculation:

16px = 1rem

PX to REM Conversion Table

PX	REM
8px	0.5rem
10px	0.625rem
12px	0.75rem
14px	0.875rem
16px	1rem
20px	1.25rem
24px	1.5rem
32px	2rem
48px	3rem
64px	4rem

Use this table for common conversions in CSS for better typography scaling.

How to Use the PX to REM Converter?

Step 1: Enter your pixel value in the input field.

Step 2: Click the “Convert” button to get the REM value instantly.

Step 3: Use the copy button to grab the calculated REM value for quick use in your CSS code.

Step 4: Reference the conversion table for standard values.

💡 Pro Tip: For accurate scaling, ensure your CSS base font size is set to 16px (default browser setting).

When to Use PX vs REM in CSS?

PX (Pixel)

✅ Best for fixed-size elements where precision is required.
✅ Ideal for borders, small icons, or design elements that shouldn’t scale.

REM (Root EM)

✅ Preferred for responsive web designs to ensure consistent scaling across devices.
✅ Best used for typography, padding, and margin values in CSS.
✅ Improves accessibility by respecting user-defined browser font sizes.

Which One Should You Use?

Use PX for fixed-size elements.
Use REM for scalable typography and layouts to improve responsiveness.

FAQs About PX to REM Conversion

How do I convert PX to REM in CSS?

To convert PX to REM, divide the pixel value by the root font size (usually 16px).
Example: 16px ÷ 16 = 1rem

What is the formula to convert PX to REM?

REM Value = PX Value ÷ Root Font Size

Why should I use REM instead of PX in CSS?

REM offers better scalability, improves accessibility, and makes maintaining responsive designs easier.

What is the default REM base size in CSS?

Most browsers use a default root font size of 16px, meaning 1rem = 16px unless otherwise defined.

Is PX still useful in modern CSS?

Yes! PX is ideal for fixed elements that shouldn’t scale, such as borders, icons, or precise UI components.

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