9 px is equal to 0.5625 rem.
The conversion from pixels (px) to rem depends on the root font size of the document, which is usually 16 pixels by default in most browsers. By dividing the pixel value by the root font size, you get the equivalent size in rem units.
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 in browsers is 16px, so to convert 9px to rem:
- Take the pixel value, 9px
- Divide by the root font size, 16px
- 9 ÷ 16 = 0.5625 rem
This works because rem units are relative to the root font size, so dividing the absolute pixel value by root size converts it into a scalable unit.
Conversion Example
- 12 px to rem:
- Start with 12px
- Divide by 16 (root font size)
- 12 ÷ 16 = 0.75 rem
- 20 px to rem:
- 20px is given
- Divide 20 by 16
- 20 ÷ 16 = 1.25 rem
- 8 px to rem:
- Given 8px
- Divide by 16
- 8 ÷ 16 = 0.5 rem
- 32 px to rem:
- 32px value
- Divide by 16
- 32 ÷ 16 = 2 rem
Conversion Chart
| 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 |
This chart shows pixel values from -16 to 34, and the equivalent rem values based on a 16px root font size. To use, find your px value and read across to see rem, useful for CSS conversions.
Related Conversion Questions
- How do I convert 9 pixels to rem units in CSS?
- What is 9 px in rem if the root font size changes?
- Is 0.5625 rem equal to 9 px always?
- How does changing browser default affect 9 px to rem conversion?
- Can I use rem instead of 9 px for responsive design?
- How do negative px values convert to rem for 9 px?
- What is the formula for converting 9 px to rem if root font size is 18px?
Conversion Definitions
px: A pixel (px) is a unit of measurement in digital imaging representing one dot on a display screen. Pixels are absolute units used to specify sizes and distances on screens, but they don’t scale depending on user settings or screen resolution.
rem: Rem stands for “root em” and is a relative unit in CSS. It measures size relative to the root element’s font size, usually the html element. Unlike px, rem scales with root font size changes, allowing scalable and accessible web design.
Conversion FAQs
Does converting 9 px to rem change if the root font size is different?
Yes, the rem value depends on the root font size. If the root font size is not 16px, dividing 9px by that size will give a different rem value. For example, if root is 20px, 9 px equals 9 ÷ 20 = 0.45 rem.
Why would I use rem instead of px when designing with 9 px?
Using rem units lets designs scale better for different user settings or devices. While 9 px is fixed and might look too small or large on some screens, rem adapts with root font size, improving accessibility and responsiveness.
Can rem values be fractional, like 0.5625 rem for 9 px?
Yes, rem values can be fractional numbers. CSS supports decimal rems for precise sizing. 0.5625 rem corresponds exactly to 9 px when root font size is 16px, giving precise control over element sizes.
Is it possible for 9 px to convert to a negative rem value?
Normally, pixel values are positive in layout, but if negative pixel values are used (like for positioning), dividing by root font size will produce negative rem values. So, -9 px would convert to -0.5625 rem if root font size is 16.
What happens if I input zero or negative values in the conversion tool?
Zero px converts to 0 rem because any number divided by root font size zero is zero. Negative values convert to negative rem values, reflecting the relative size in the opposite direction. The tool handles these mathematically without errors.