0.5 rem equals 8 pixels (px).
This result assumes the default browser font size of 16 pixels. A rem unit represents the font size of the root element (html), so 0.5 rem means half of that root font size, which is 8 pixels.
Conversion Tool
Result in px:
Conversion Formula
The formula to convert rem to px depends on the root font size, which browsers set to 16 pixels by default. The conversion is:
pixels = rem × root font size (in px)
Because rem units scale relative to the root element’s font size, multiplying the rem value by 16 converts it directly to pixels. For example, converting 0.5 rem:
- Identify root font size: 16px
- Multiply rem value by root size: 0.5 × 16 = 8
- Result: 8 pixels
This is the basic math behind rem to px conversion.
Conversion Example
- 1.2 rem to px
- Root size = 16px
- Calculation: 1.2 × 16 = 19.2
- Answer: 19.2 pixels
- 2 rem to px
- Root size = 16px
- Calculation: 2 × 16 = 32
- Answer: 32 pixels
- 0.75 rem to px
- Root size = 16px
- Calculation: 0.75 × 16 = 12
- Answer: 12 pixels
- 3.5 rem to px
- Root size = 16px
- Calculation: 3.5 × 16 = 56
- Answer: 56 pixels
Conversion Chart
The table below shows rem values from -24.5 to 25.5 and their equivalent pixel sizes, assuming 16px root font size. Negative rem values can represent offsets or negative margins in CSS. Use this chart by finding the rem value in the left column and reading the corresponding pixel value on the right.
| rem | px |
|---|---|
| -24.5 | -392 |
| -24 | -384 |
| -23.5 | -376 |
| -23 | -368 |
| -22.5 | -360 |
| -22 | -352 |
| -21.5 | -344 |
| -21 | -336 |
| -20.5 | -328 |
| -20 | -320 |
| -19.5 | -312 |
| -19 | -304 |
| -18.5 | -296 |
| -18 | -288 |
| -17.5 | -280 |
| -17 | -272 |
| -16.5 | -264 |
| -16 | -256 |
| -15.5 | -248 |
| -15 | -240 |
| -14.5 | -232 |
| -14 | -224 |
| -13.5 | -216 |
| -13 | -208 |
| -12.5 | -200 |
| -12 | -192 |
| -11.5 | -184 |
| -11 | -176 |
| -10.5 | -168 |
| -10 | -160 |
| -9.5 | -152 |
| -9 | -144 |
| -8.5 | -136 |
| -8 | -128 |
| -7.5 | -120 |
| -7 | -112 |
| -6.5 | -104 |
| -6 | -96 |
| -5.5 | -88 |
| -5 | -80 |
| -4.5 | -72 |
| -4 | -64 |
| -3.5 | -56 |
| -3 | -48 |
| -2.5 | -40 |
| -2 | -32 |
| -1.5 | -24 |
| -1 | -16 |
| -0.5 | -8 |
| 0 | 0 |
| 0.5 | 8 |
| 1 | 16 |
| 1.5 | 24 |
| 2 | 32 |
| 2.5 | 40 |
| 3 | 48 |
| 3.5 | 56 |
| 4 | 64 |
| 4.5 | 72 |
| 5 | 80 |
| 5.5 | 88 |
| 6 | 96 |
| 6.5 | 104 |
| 7 | 112 |
| 7.5 | 120 |
| 8 | 128 |
| 8.5 | 136 |
| 9 | 144 |
| 9.5 | 152 |
| 10 | 160 |
| 10.5 | 168 |
| 11 | 176 |
| 11.5 | 184 |
| 12 | 192 |
| 12.5 | 200 |
| 13 | 208 |
| 13.5 | 216 |
| 14 | 224 |
| 14.5 | 232 |
| 15 | 240 |
| 15.5 | 248 |
| 16 | 256 |
| 16.5 | 264 |
| 17 | 272 |
| 17.5 | 280 |
| 18 | 288 |
| 18.5 | 296 |
| 19 | 304 |
| 19.5 | 312 |
| 20 | 320 |
| 20.5 | 328 |
| 21 | 336 |
| 21.5 | 344 |
| 22 | 352 |
| 22.5 | 360 |
| 23 | 368 |
| 23.5 | 376 |
| 24 | 384 |
| 24.5 | 392 |
| 25 | 400 |
| 25.5 | 408 |
Related Conversion Questions
- How many pixels equals 0.5 rem in CSS?
- What does 0.5 rem convert to in pixels with default browser size?
- Is 0.5 rem always 8 pixels on every website?
- How to calculate pixels from 0.5 rem if root font size changes?
- Why 0.5 rem sometimes not equal to 8px in some browsers?
- Can 0.5 rem be less than 8 pixels if user zooms in?
- What pixel size corresponds to 0.5 rem on mobile devices?
Conversion Definitions
rem: A CSS unit representing the font size of the root element (html). It scales elements relative to this root size, allowing consistent sizing across a page. Rem helps to create responsive designs, adjusting if the root font size changes by user or stylesheet.
px: Pixels are fixed-size units representing individual screen dots. It defines exact sizes on display devices. Unlike rem, px does not scale based on element or root sizes. Pixels are the most basic unit in digital layout, controlling precise dimensions.
Conversion FAQs
Can the value of 0.5 rem change depending on user settings?
Yes, 0.5 rem depends on the root font size, which users can change in browser settings or by zooming. If the root font size becomes larger or smaller, 0.5 rem will scale accordingly, so it might not always equal exactly 8 pixels.
Why might 0.5 rem not equal 8px in some CSS environments?
If the root font size is modified by CSS or inherited from parent styles, 0.5 rem will reflect that new base. For example, if html font size is set to 20px, then 0.5 rem equals 10px. So without a standard root size, the pixel equivalent changes.
Is rem better than px for responsive design?
Rem units scale with the root font size, making it easier to maintain proportional sizes across different devices and user settings. Pixels are fixed and don’t adjust automatically, which can cause accessibility or layout issues on varied screen sizes.
How does browser zoom affect rem to px conversion?
When zooming, browsers adjust the root font size, thus changing rem unit’s pixel equivalent. This means 0.5 rem can be larger or smaller in pixels depending on zoom level, allowing text and elements to resize for readability.
Can negative rem values be used and converted to pixels?
Yes, negative rem values are valid in CSS for margins or positioning. When converted, they produce negative pixel values, indicating movement or offset in the opposite direction from a positive value.
