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CSS UNITS

REM to PX Converter

Convert rem to pixels and pixels to rem using any root font size for responsive CSS development.

REM to PX Converter

This calculator auto-updates when values change.

Result

16px

Formula

1rem x 16px

0.125rem

2px

0.25rem

4px

0.5rem

8px

0.75rem

12px

1rem

16px

1.25rem

20px

1.5rem

24px

2rem

32px

3rem

48px

4rem

64px

5rem

80px

About This REM to PX Converter

This REM to PX converter translates between rem units and pixel values using the root font size you choose.

It is useful when converting design specs to CSS, checking spacing systems, or auditing typography scales.

How to Use This Tool

  1. 1

    Set the root font size

    Use your project root font size, commonly 16px by default.

  2. 2

    Choose conversion direction

    Convert rem to px or px to rem.

  3. 3

    Review common conversions

    Use the generated table for quick CSS reference values.

Frequently Asked Questions

What is 1rem?v

1rem equals the root element font size. In many browsers and projects, that default is 16px.

Can root font size change?v

Yes. CSS on the html element can change the root size, so use the value from your project.

How do I convert pixels to rem?v

Divide the pixel value by the root font size.