20 px is equal to 1.25 rem.
To convert pixels (px) to rem units, you divide the pixel value by the root font size, which is commonly 16 pixels in most browsers. This means 20 pixels divided by 16 equals 1.25 rem.
Conversion Tool
Result in rem:
Conversion Formula
The formula to convert pixels to rem is:
rem = px ÷ root font size
Where the root font size is commonly 16 pixels in web browsers. This formula works because rem units are relative to the root element font size, so dividing the pixel value by 16 converts it into rem.
Example:
- Given 20 px, and root font size 16 px
- 20 ÷ 16 = 1.25 rem
Conversion Example
- Convert 32 px to rem:
- Start with 32 px.
- Divide by 16 (root font size): 32 ÷ 16 = 2.
- Result: 2 rem.
- Convert 48 px to rem:
- 48 px divided by 16 equals 3.
- So, 48 px = 3 rem.
- Convert 10 px to rem:
- 10 ÷ 16 = 0.625.
- Therefore, 10 px equals 0.625 rem.
- Convert 5 px to rem:
- 5 divided by 16 is 0.3125.
- So, 5 px converts to 0.3125 rem.
- Convert 64 px to rem:
- 64 px divided by 16 equals 4.
- This means 64 px is 4 rem.
Conversion Chart
| Pixels (px) | Rem |
|---|---|
| -5.0 | -0.3125 |
| 0.0 | 0.0000 |
| 5.0 | 0.3125 |
| 10.0 | 0.6250 |
| 15.0 | 0.9375 |
| 20.0 | 1.2500 |
| 25.0 | 1.5625 |
| 30.0 | 1.8750 |
| 35.0 | 2.1875 |
| 40.0 | 2.5000 |
| 45.0 | 2.8125 |
This chart shows pixel values and their equivalents in rem based on a root font size of 16 pixels. You can look up a pixel value in the first column, then find the rem equivalent in the second column to use in your CSS.
Related Conversion Questions
- How do I convert 20 pixels to rem for responsive design?
- What is the rem value of 20px if the root font size changes?
- Can 20px be accurately converted to rem in all browsers?
- Why would 20px convert to 1.25 rem in CSS?
- How does changing the root font size affect 20px to rem conversion?
- Is 20px equal to 1 rem or 1.25 rem by default?
- What happens if I use 20px as rem without conversion?
Conversion Definitions
px: A pixel (px) is a unit of measurement in digital screens representing a single point in a raster image. Pixels are absolute units used in CSS to define fixed sizes of elements. Their size depends on device resolution but usually corresponds to one dot on screen.
rem: The rem unit stands for “root em,” it’s a relative length unit in CSS based on the font size of the root element (<html>). It allows scalable and flexible layouts because all rem values adjust if the root font size changes, unlike fixed pixel units.
Conversion FAQs
Why is the root font size considered 16 pixels for px to rem conversion?
Most browsers set the default font size for the root element to 16 pixels. Because rem units are relative to this root font size, calculations divide pixel values by 16 to convert to rem. If the root size changes, the conversion must adjust accordingly to stay accurate.
Can the rem value for 20 px change if I modify my website’s base font size?
Yes, since rem units are relative to the root font size, if the base font size of the <html> element changes from 16 px to, say, 10 px, then 20 px would equal 2 rem (20 ÷ 10). This flexibility allows for easily scalable designs across devices and user preferences.
What is the advantage of using rem instead of px for font sizes?
Using rem allows fonts and elements to scale consistently when the root font size changes, improving accessibility and responsiveness. Pixels are fixed units, so they don’t adjust if user zooms or changes default settings, while rem units support flexible layouts.
Is it always safe to assume 16 px as root font size for conversions?
Not always, some websites or browsers might override the default root font size. Before converting px to rem, check the actual font size on the root element. Using developer tools or CSS inspection helps avoid mismatches in scaling when the root size differs from 16 px.
Does negative pixel values convert correctly to rem?
Negative pixel values can be converted to rem by dividing by the root font size, producing negative rem values. While uncommon, negative values might be used for offsets or positioning, but they must be handled carefully in CSS to avoid unexpected behavior.
