MasterTool

REM to PX Converter

Use rem to px converter locally, without uploading your data.

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What this tool does

Use rem to px converter locally, without uploading your data. Computed font-size context determines the conversion; negative CSS lengths are supported.

How to use the REM to PX Converter

  1. Enter or select rem value.
  2. Enter or select root font size (px).
  3. Read the calculated result; change any measurement to compare alternatives.

Formula

px=rem×root font size
value
REM value
base
Root font size (px)

Computed font-size context determines the conversion; negative CSS lengths are supported.

Worked example

For rem to px converter, the following measurements illustrate the exact method: REM value: 1; Root font size (px): 16.

Inputs

  • REM value1
  • Root font size (px)16

Result

  • Pixels16

Results explained

Pixels
Pixels from the formula above. Computed font-size context determines the conversion; negative CSS lengths are supported.

Frequently asked questions

px=rem×root font size

Computed font-size context determines the conversion; negative CSS lengths are supported.

No. Content stays in your browser and no API is called.

Copy the result, review it in your project, and test it in the intended environment.

No. Syntax checks and conversions cannot replace application-specific testing, security review or accessibility review.