1 px is equal to 0.0625 rem.
The conversion from pixels (px) to rem units depends on the base font size of the HTML document, which is typically 16 pixels by default in most browsers. So, 1 px divided by 16 px equals 0.0625 rem, making rem a scalable unit relative to the root font size.
Conversion Tool
Result in rem:
Conversion Formula
The formula to convert px to rem is rem = px ÷ baseFontSize. In most browsers, the base font size is 16 pixels, but this can be changed by CSS on the root element. This formula works because rem units are relative to the root font size, so dividing the pixel value by 16 translates pixels into rem.
Example:
- Suppose you want to convert 24 px to rem.
- Using rem = px ÷ 16, it becomes 24 ÷ 16.
- The result is 1.5 rem.
- This means 24 pixels equals 1.5 times the root font size in rem units.
Conversion Example
- Convert 8 px to rem:
- Divide 8 by 16 (base font size): 8 ÷ 16 = 0.5 rem.
- So, 8 px equals 0.5 rem.
- Convert 32 px to rem:
- 32 ÷ 16 = 2 rem.
- That means 32 px is twice the root font size.
- Convert 10 px to rem:
- 10 ÷ 16 = 0.625 rem.
- This value scales relative to root font size.
- Convert 50 px to rem:
- 50 ÷ 16 = 3.125 rem.
- It represents a larger size, over 3 times the root font.
- Convert 5 px to rem:
- 5 ÷ 16 = 0.3125 rem.
- This is a small fraction of the root font size.
Conversion Chart
The chart below lists px values from -24.0 to 26.0 and their rem equivalents. Negative values might represent offsets or margins in CSS.
| Pixels (px) | Rem (rem) |
|---|---|
| -24.0 | -1.5000 |
| -20.0 | -1.2500 |
| -16.0 | -1.0000 |
| -12.0 | -0.7500 |
| -8.0 | -0.5000 |
| -4.0 | -0.2500 |
| 0.0 | 0.0000 |
| 2.0 | 0.1250 |
| 4.0 | 0.2500 |
| 8.0 | 0.5000 |
| 12.0 | 0.7500 |
| 16.0 | 1.0000 |
| 20.0 | 1.2500 |
| 24.0 | 1.5000 |
| 26.0 | 1.6250 |
To use the chart, find the pixel value in the left column, and then read the corresponding rem value on the right. This helps when you want quick conversion without calculation.
Related Conversion Questions
- How many rem is 1 px equal to when root font size changes?
- What is the rem value of 1 px if base font size is not 16?
- Can 1 px be accurately converted to rem in responsive design?
- Does 1 px always equal 0.0625 rem in all browsers?
- How does browser zoom affect the conversion from 1 px to rem?
- Is 1 px smaller or larger than 1 rem on mobile devices?
- Why is 1 px converted to rem by dividing by 16?
Conversion Definitions
px: Pixel (px) is a unit of measurement in digital imaging and screen resolution representing a single point or dot on a display. It is an absolute unit, fixed in size, and depends on the device’s pixel density. Pixels are used for defining sizes in CSS and graphics.
rem: Rem stands for “root em” and is a relative CSS unit based on the font size of the root element (usually the <html> tag). Unlike px, rem scales with the root font size, allowing more flexible and accessible designs across different screen sizes and user settings.
Conversion FAQs
Why does 1 px equal 0.0625 rem in most cases?
The default root font size in browsers is 16 pixels. Since rem units reference this root size, converting pixels to rem involves dividing the pixel value by 16. So, 1 px ÷ 16 equals 0.0625 rem. This means 1 px represents a very small scalable fraction of the base font size.
Can the conversion from px to rem change on different websites?
Yes, if the website changes the root font size using CSS (like setting <html> font-size to 10px), the conversion ratio changes. For example, with a root font size of 10 px, 1 px equals 0.1 rem instead of 0.0625. So, the base font size controls how px converts into rem.
Is converting 1 px to rem good for responsive design?
Converting pixels to rem helps create scalable and consistent layouts. Using rem units instead of px allows elements to resize relative to user preferences or device settings. However, very small sizes like 1 px converted to rem might be too tiny to see or interact with on some devices.
What happens if the user changes browser zoom or default font size?
When users zoom or adjust default font size, rem units scale accordingly because they depend on the root font size. Pixels remain fixed in size. Therefore, using rem units for sizing improves accessibility and adaptability across different user settings, unlike fixed px values.
Why might negative px values be converted to rem?
Negative px values are used for positioning or margins in CSS to shift elements in opposite directions. Converting them to rem works the same way by dividing by the root font size, which maintains consistent proportional spacing relative to the root font size rather than fixed units.