0.5 rem is equal to 8 pixels (px).
This conversion comes from the base font size, which is usually 16 pixels by default in most browsers. Since 1 rem equals the root font size, half of that (0.5 rem) equals half of 16 pixels, making it 8 pixels.
Conversion Tool
Result in px:
Conversion Formula
The formula to convert rem to pixels (px) is:
px = rem × root font size
Since the root font size in browsers is commonly 16px, multiplying rem value by 16 gives the pixel value. This works because rem units relate directly to the root element’s font size, making it scalable.
For example, converting 0.5 rem to px:
- Start with 0.5 rem
- Multiply by 16 (base font size): 0.5 × 16 = 8
- Result: 8 px
Conversion Example
- 1.25 rem to px:
- Take 1.25 rem
- Multiply by 16: 1.25 × 16 = 20
- So, 1.25 rem = 20 px
- 2 rem to px:
- Start with 2 rem
- Multiply by 16: 2 × 16 = 32
- Answer is 32 px
- 0.75 rem to px:
- Take 0.75 rem
- Multiply by 16: 0.75 × 16 = 12
- So, 0.75 rem equals 12 px
- 3.5 rem to px:
- Multiply 3.5 by 16: 3.5 × 16 = 56
- Result is 56 px
Conversion Chart
This chart shows rem values from -24.5 up to 25.5 and their pixel equivalents, making it easy to find conversions without calculations. Negative values represent negative pixel values, useful in positioning or animations.
| rem | px | rem | px | rem | px |
|---|---|---|---|---|---|
| -24.5 | -392 | 0 | 0 | 24.5 | 392 |
| -23.5 | -376 | 0.5 | 8 | 25.5 | 408 |
| -22.5 | -360 | 1.5 | 24 | ||
| -21.5 | -344 | 2.5 | 40 | ||
| -20.5 | -328 | 3.5 | 56 | ||
| -19.5 | -312 | 4.5 | 72 | ||
| -18.5 | -296 | 5.5 | 88 | ||
| -17.5 | -280 | 6.5 | 104 | ||
| -16.5 | -264 | 7.5 | 120 | ||
| -15.5 | -248 | 8.5 | 136 | ||
| -14.5 | -232 | 9.5 | 152 | ||
| -13.5 | -216 | 10.5 | 168 | ||
| -12.5 | -200 | 11.5 | 184 | ||
| -11.5 | -184 | 12.5 | 200 | ||
| -10.5 | -168 | 13.5 | 216 | ||
| -9.5 | -152 | 14.5 | 232 | ||
| -8.5 | -136 | 15.5 | 248 | ||
| -7.5 | -120 | 16.5 | 264 | ||
| -6.5 | -104 | 17.5 | 280 | ||
| -5.5 | -88 | 18.5 | 296 | ||
| -4.5 | -72 | 19.5 | 312 | ||
| -3.5 | -56 | 20.5 | 328 | ||
| -2.5 | -40 | 21.5 | 344 | ||
| -1.5 | -24 | 22.5 | 360 | ||
| -0.5 | -8 | 23.5 | 376 |
Related Conversion Questions
- How many pixels equal 0.5 rem in CSS?
- What is the pixel value for 0.5 rem if the base font size changes?
- Can 0.5 rem be converted to px without knowing root font size?
- Why does 0.5 rem sometimes not equal 8px on some websites?
- How to calculate 0.5 rem in pixels for responsive design?
- Is 0.5 rem always half of 16 pixels?
- What happens to pixel size when rem base font size is modified but rem is 0.5?
Conversion Definitions
rem: A CSS unit that stands for “root em”, representing the font size of the root element of the document. It scales relative to the root font size, allowing consistent sizing across different elements while maintaining responsiveness to user settings or browser defaults.
px: A pixel unit used in digital displays to represent a single dot on the screen. Pixels are absolute units, providing fixed size regardless of screen resolution or zoom, commonly used to specify exact dimensions in web design and graphics.
Conversion FAQs
Does 0.5 rem always equal 8 pixels?
Not always. 0.5 rem equals 8 px only when the root font size is 16 px, which is default in most browsers. If the root font size changes, the pixel value for 0.5 rem adjusts accordingly, so it’s important to check or set the root font size before converting.
Why might 0.5 rem convert differently on some websites?
Because sites can customize their root font size using CSS on the html element, the value of 1 rem changes accordingly. If root font size is set to 20px, then 0.5 rem equals 10 px instead of 8 px. Browser zoom or user settings can also affect this.
Is rem better than px for responsive design?
Yes, rem units scale with the root font size, allowing designs to adapt when users change font settings or on different devices. Pixels stay fixed, which might cause layout issues on varying screen sizes or accessibility needs.
How can I find the root font size if I want to convert rem to px?
You can inspect the root element (html) in browser developer tools to see its computed font size. This value is the base for rem calculations. If not set explicitly, it defaults to 16px in most browsers.
Can rem units be negative, like -0.5 rem?
Yes, negative rem values are valid and often used in CSS for positioning or offsets. For example, -0.5 rem corresponds to -8 px (assuming 16 px root font size), moving elements opposite direction by that amount.