9 px equals 0.5625 rem.
The conversion from pixels to rem depends on the root font size, which is commonly set to 16 pixels. So, dividing 9 by 16 gives the rem value. This method helps to maintain scalable and responsive designs in web development.
Conversion Tool
Result in rem:
Conversion Formula
The formula to convert pixels (px) to rem is:
rem = px ÷ root font size
Usually, the root font size on most browsers is 16 pixels. This means you divide the pixel value by 16 to get the rem value, which allows the size to scale relative to the root element. Since rem is relative, changing the root font size changes all rem-based sizes.
Example calculation for 9 px:
- Start with 9 px.
- Divide 9 by 16 (default root font size): 9 ÷ 16 = 0.5625.
- The result is 0.5625 rem.
Conversion Example
- 12 px to rem
- Divide 12 by 16.
- 12 ÷ 16 = 0.75 rem.
- Therefore, 12 px equals 0.75 rem.
- 18 px to rem
- 18 divided by 16 equals 1.125 rem.
- So, 18 px = 1.125 rem.
- 24 px to rem
- 24 ÷ 16 = 1.5 rem.
- Thus, 24 px converts to 1.5 rem.
- 8 px to rem
- 8 divided by 16 is 0.5 rem.
- Hence, 8 px equals 0.5 rem.
Conversion Chart
The chart below shows px values from -16.0 to 34.0 and their corresponding rem values calculated by dividing by 16. This helps you quickly find rem values without calculating each time.
| 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 |
Related Conversion Questions
- How many rems equal 9 pixels in CSS?
- What’s the rem value for 9 px if root font size changes?
- Is 9 px smaller or bigger than 1 rem?
- How to convert 9 px to rem for mobile-friendly design?
- Why does 9 px equal 0.5625 rem with 16px root size?
- Can I use rem instead of 9 px for font size?
- What’s the difference between 9 px and 0.5625 rem on different browsers?
Conversion Definitions
px (Pixel): A pixel is the smallest unit of measurement on a digital display, representing a single point in a raster image or on a screen. Pixels are absolute units used to define sizes in digital design, but they do not scale relative to other elements or user settings.
rem (Root em): Rem is a relative unit in CSS that scales based on the root element’s font size. Unlike pixels, rem units allow designs to adjust proportionally when the root font size changes, enabling better accessibility and responsive layouts.
Conversion FAQs
Why is the root font size usually 16 pixels?
Most browsers set the default root font size to 16 pixels, which balances readability and layout consistency across devices. This value became a standard baseline for web designers to work with but can be changed by the user or developer to scale the entire page.
Can rem values change if user changes browser settings?
Yes, if a user modifies the default font size in their browser preferences, rem units scale accordingly. Since rem references the root font size, adjusting this setting will increase or decrease all rem-based measurements, improving accessibility.
Is it always better to use rem instead of px?
Rem units offer flexibility and scalability, making them good for responsive designs. However, pixels provide precise control when exact sizing is needed. The choice depends on the design goals and context; mixing both often happens in practice.
How do negative pixel values convert to rem?
Negative pixel values convert to negative rem values by the same division rule. This can be useful for positioning elements or offsets in CSS. For example, -16 px becomes -1 rem if the root font size is 16 px.
Does changing the root font size affect images or only text?
Changing the root font size affects rem-based units, which are often used for font sizes, spacing, and layout components. Images sized with pixels remain unchanged unless styled with rem units, so root font size changes usually don’t affect pixel-based image sizes.
