REM to PX Converter
Convert REM units to pixel measurements.
REM to PX Converter
Convert CSS REM units back to exact pixel values.
CSS Unit Converter
Default browser root size is usually 16px.
Converted Output
1 rem
16 px
What is the REM to PX Converter and How Does It Work?
The REM to PX Converter translates CSS REM units back into fixed pixel values, useful when you need to know the exact rendered pixel size of a REM-based measurement, such as for design specs or pixel-precise layout checks.
Since REM units are relative to the root element's font size, multiplying a REM value by the base font size (typically 16px) converts it back to an exact pixel value.
1 × 16 = 16 - at the default base size, 1rem always equals exactly 16px.
2.5 × 16 = 40.
Common Real-World Use Cases
Confirm the exact pixel size a REM-based CSS value renders as, for pixel-precise design review.
Translate REM-based developer specs into pixel values that designers or stakeholders can more easily visualize.
Check the actual rendered pixel size of an element when the root font size has been customized away from the 16px default.
How This Compares
This tool multiplies a REM value by the base font size to get pixels. If you already have a pixel value and need its REM equivalent instead, use the PX to REM Converter, which performs the reverse (division) operation.
- 1Enter the REM value you want to convert.
- 2Set your base font size (default is 16px, the browser standard).
- 3View the equivalent pixel value.
- •If a project sets a custom root font size (e.g. 62.5% to make 1rem = 10px), enter that value as the base for an accurate conversion.
- •REM-to-PX conversion is especially useful for verifying design specs when the root font size differs from the 16px default.
Frequently Asked Questions
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