Convert REM to Pixel.
Input the value of rem below to convert instantly to pixels with standard conversions, definitions, and equations.
About converting rem to pixels
Rem to pixels is the conversion that tells a developer exactly how large a rem-based size will render, given the root font size.
With the standard 16 px root, converting rem to pixels means multiplying by 16: 1 rem is 16 px, 1.25 rem is 20 px, and 2.5 rem is 40 px.
Translating rem back to pixels is handy when matching a design handed over in pixels, or when debugging why an element renders larger than expected on a site that has changed its root font size. Remember the multiplier is whatever the root font size actually is — 16 px is only the default, not a guarantee.
- Default math: rem × 16 = px.
- If a site sets html { font-size: 62.5% }, the root becomes 10 px and 1 rem = 10 px instead.
How to Convert REM to Pixels
To convert rem to pixel, we use the official conversion formulas. Below is the mathematical formula, plain-English explanation, and a worked example.
REM (rem)
Font size of the root element (assumed to be 16px by default).
Pixel (px)
The core unit of screen measurements. Represented as 1/96 of an inch.
REM to Pixel Conversion Table
| REM (rem) | Pixel (px) |
|---|---|
| 1 rem | 16 px |
| 2 rem | 32 px |
| 3 rem | 48 px |
| 5 rem | 80 px |
| 10 rem | 160 px |
| 15 rem | 240 px |
| 20 rem | 320 px |
| 25 rem | 400 px |
| 50 rem | 800 px |
| 100 rem | 1600 px |
| 250 rem | 4000 px |
| 500 rem | 8000 px |
| 1000 rem | 16000 px |
Pixel to REM Conversion Table
| Pixel (px) | REM (rem) |
|---|---|
| 1 px | 0.0625 rem |
| 2 px | 0.125 rem |
| 3 px | 0.1875 rem |
| 5 px | 0.3125 rem |
| 10 px | 0.625 rem |
| 15 px | 0.9375 rem |
| 20 px | 1.25 rem |
| 25 px | 1.5625 rem |
| 50 px | 3.125 rem |
| 100 px | 6.25 rem |
| 250 px | 15.625 rem |
| 500 px | 31.25 rem |
| 1000 px | 62.5 rem |