PX to Percentage Converter & Conversion Tables [Online Calculator]

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

To convert PX to Percentage, use this formula: % Value = (PX Value ÷ Container Width) × 100 . Example: 300px ÷ 1200 × 100 = 25% .

Q: What is the default container width for Percentage conversion?

Most designs use 1200px as the standard container width for desktop layouts. For mobile-first designs, consider using 360px or 768px .

Easily convert pixels (PX) to percentage (%) with this free online CSS unit converter. Ideal for web designers, developers, and UI/UX professionals, this calculator ensures precise scaling for responsive layouts, flexible grid designs, and dynamic web elements.

✅ Perfect for scaling elements relative to their parent container size.
✅ Designed to streamline your workflow for fluid, scalable layouts.

Start Converting Now →

PX to Percentage Conversion Calculator

PX to Percentage Converter

Enter your PX value below to instantly convert it to Percentage.

Pixel (PX) Value: Container Width (default 1200px): Percentage (%) Value:

Input Field → Enter Pixel (PX) Value
Container Width Input → Enter Container Width Value (default: 1200px)
Convert Button → Instantly Calculate Percentage Value
Copy Button → One-click copy for easy use in CSS code
Reset Button → Clear your inputs with one click

Example Calculation:

300px in a 1200px container = 25%

PX to Percentage Conversion Table (Based on 1200px Container)

PX	%
100px	8.33%
200px	16.67%
300px	25%
400px	33.33%
500px	41.67%
600px	50%
800px	66.67%
1000px	83.33%
1200px	100%

Use this table for common conversions in CSS for better scalability.

How to Use the PX to Percentage Converter?

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

Step 2: Enter your desired container width (default 1200px for desktop).

Step 3: Click the “Convert” button to get the percentage value instantly.

Step 4: Use the copy button to grab the calculated percentage value for quick use in your CSS code.

Step 5: Reference the conversion table for standard values.

💡 Pro Tip: For accurate scaling, adjust the container width based on different viewport sizes for responsive designs.

When to Use PX vs Percentage in CSS?

PX (Pixel)

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

Percentage (%)

✅ Preferred for responsive web designs where elements should scale relative to their parent container.
✅ Best used for grid layouts, columns, and flexible sections.

Which One Should You Use?

Use PX for precise, fixed-size elements.
Use Percentage for elements that should adapt to container size changes.

FAQs About PX to Percentage Conversion

How do I convert PX to Percentage in CSS?

To convert PX to Percentage, use this formula: % Value = (PX Value ÷ Container Width) × 100. Example: 300px ÷ 1200 × 100 = 25%.

What is the formula to convert PX to Percentage?

% Value = (PX Value ÷ Container Width) × 100

Why should I use Percentage instead of PX in CSS?

Percentage ensures elements scale relative to their parent container, ideal for responsive designs.

What is the default container width for Percentage conversion?

Most designs use 1200px as the standard container width for desktop layouts. For mobile-first designs, consider using 360px or 768px.

Is Percentage better for flexible grid designs in modern CSS?

Yes! Percentage-based layouts allow for fluid designs that adjust seamlessly to different screen sizes.

Try Our CSS Unit Converters for Free!

Looking for more CSS unit conversions? Explore our full range of free conversion tools: