9 px equals 0.5625 rem.
The conversion from pixels (px) to rem units depends on the root font size, which is usually 16 pixels in most browsers. Dividing 9 pixels by 16 results in 0.5625 rem, which means 9 px is just over half of the base font size.
Conversion Tool
Result in rem:
Conversion Formula
To convert px to rem, the formula is: rem = px ÷ root font size. The root font size is commonly set to 16 pixels, but it can be different depending on the CSS settings.
This formula works because rem units are relative to the root element’s font size. When you divide the pixel value by that root size, you get how many rem units it equals.
For example, with 9 px and root font size 16 px:
- Start with 9 px.
- Divide 9 by 16, the root font size.
- 9 ÷ 16 = 0.5625 rem.
Conversion Example
- Example 1: Convert 24 px to rem
- Take 24 px.
- Divide by 16 (root font size).
- 24 ÷ 16 = 1.5 rem.
- Example 2: Convert 12 px to rem
- Start with 12 pixels.
- Divide 12 by 16.
- 12 ÷ 16 = 0.75 rem.
- Example 3: Convert 5 px to rem
- Begin with 5 px.
- Divide 5 by 16.
- 5 ÷ 16 = 0.3125 rem.
- Example 4: Convert 32 px to rem
- Use 32 pixels.
- Divide 32 by 16.
- 32 ÷ 16 = 2 rem.
- Example 5: Convert 7 px to rem
- Start with 7 px.
- Divide 7 by 16.
- 7 ÷ 16 = 0.4375 rem.
Conversion Chart
| Pixels (px) | Rem |
|---|---|
| -16.0 | -1.0000 |
| -12.0 | -0.7500 |
| -8.0 | -0.5000 |
| -4.0 | -0.2500 |
| 0.0 | 0.0000 |
| 4.0 | 0.2500 |
| 8.0 | 0.5000 |
| 12.0 | 0.7500 |
| 16.0 | 1.0000 |
| 20.0 | 1.2500 |
| 24.0 | 1.5000 |
| 28.0 | 1.7500 |
| 30.0 | 1.8750 |
| 32.0 | 2.0000 |
| 34.0 | 2.1250 |
The chart shows px values on the left, and their rem equivalents on the right. You can use it for quick reference, just find the px value closest to what you need and see its rem conversion. Negative values mean less than zero size, which might be useful in some CSS cases.
Related Conversion Questions
- How many rem is 9 pixels in CSS?
- What is the rem value for 9 px if root font size is 16?
- How do you convert 9px to rem units in a website?
- Is 9 px equal to 0.5625 rem always?
- Why does 9px equal 0.5625 rem in CSS?
- What is the formula to convert 9px to rem?
- Can I use 9px instead of rem for responsive design?
Conversion Definitions
px: px, short for pixels, is a fixed measurement unit used in digital displays and web design. It represents a single dot on the screen, varying in physical size across different devices. Pixels are absolute units, which means their size doesn’t change relative to parent elements or font sizes.
rem: rem stands for “root em” and is a relative length unit in CSS. It measures size relative to the root element’s font size, often 16 pixels. Using rem allows scalable and consistent sizing across a webpage, adapting better to user settings and accessibility needs.
Conversion FAQs
Does the root font size affect px to rem conversion?
Yes, the root font size is crucial because rem is relative to it. If the root font size changes from the default 16 pixels, the conversion result changes too. So 9 px divided by a different root font size would give a different rem value, making the conversion flexible but dependent on context.
Can rem units cause layout issues when the root font size changes?
Using rem units means layout scales with the root font size, which is good for responsiveness but can cause unexpected changes if the root size is modified, for example by browser settings or CSS overrides. This scaling behavior might cause elements to appear larger or smaller than intended if not accounted for.
Why convert px to rem instead of using px directly?
Rem units offer scalability, improving accessibility since users can adjust the root font size for better readability. Pixels stay fixed, which might not adapt well to different screens or user preferences. However, px can be simpler to use for fixed-size elements or precise control.
What happens if I use fractional rem values like 0.5625rem?
Fractional rem values are valid and browsers render them smoothly. They allow precise sizing smaller or in between whole units. For example, 0.5625rem is just over half the root font size, giving finer control over design details, like spacing or font sizes.
Is it possible to have rem units without a default root font size?
Technically, rem units depend on the root font size, which browsers assign a default, usually 16 pixels. Without any root font size set, browsers use their default. If the root font size is zero or unset, rem calculations would become meaningless or zero, breaking layout scaling.