Samantha Nicole20 px equals 1.25 rem.
The conversion from pixels (px) to rem units depends on the root font size, which is commonly 16 pixels in browsers. To convert 20 pixels to rem, divide 20 by 16, resulting in 1.25 rem. This means 20 pixels is 1.25 times the root font size.
Conversion Tool
Result in rem:
Conversion Formula
The formula to convert pixels (px) to rem units is simple: divide the pixel value by the root font size in pixels. Typically, the root font size is 16 pixels in most browsers, but it can change if customized.
Mathematically it looks like this:
rem = px ÷ root font size (in px)
For example, to convert 20 px to rem:
- Identify root font size: 16 px
- Divide 20 px by 16 px
- 20 ÷ 16 = 1.25 rem
This works because rem units scale relative to the root font size, so dividing pixel values by that root size converts absolute pixels into scalable units.
Conversion Example
- Convert 32 px to rem:
- Root font size is 16 px
- 32 ÷ 16 = 2 rem
- Result is 2 rem
- Convert 8 px to rem:
- Divide 8 by 16
- 8 ÷ 16 = 0.5 rem
- Result is 0.5 rem
- Convert 24 px to rem:
- 24 ÷ 16 = 1.5 rem
- Answer is 1.5 rem
- Convert 10 px to rem:
- Divide 10 by 16
- 10 ÷ 16 = 0.625 rem
- So, 0.625 rem is the result
- Convert 48 px to rem:
- 48 ÷ 16 = 3 rem
- Output is 3 rem
Conversion Chart
| Pixels (px) | Rem (rem) |
|---|---|
| -5.0 | -0.3125 |
| 0.0 | 0 |
| 5.0 | 0.3125 |
| 10.0 | 0.6250 |
| 15.0 | 0.9375 |
| 20.0 | 1.25 |
| 25.0 | 1.5625 |
| 30.0 | 1.875 |
| 35.0 | 2.1875 |
| 40.0 | 2.5 |
| 45.0 | 2.8125 |
The chart shows pixel values in the left column and their rem equivalents on the right. You can find a pixel value and see what rem value it corresponds to by dividing by 16. Negative values are allowed but uncommon in styling.
Related Conversion Questions
- How many rems is 20 pixels converted to in CSS?
- What is the rem value for 20 px if the root font size is not 16px?
- Can 20 px be accurately converted to rem for responsive design?
- How do I convert 20px padding to rem units in my stylesheet?
- Why does 20px convert to 1.25 rem when the root font size is 16px?
- Is 20 pixels bigger or smaller than 1 rem?
- How to calculate rem from 20px if the base font size changes in the browser?
Conversion Definitions
px (pixel): A px is a unit that represents a single dot on a computer screen or device display. It is an absolute measurement used in digital design to specify size, spacing, or resolution. Pixels are fixed and do not scale with user settings.
rem (root em): rem is a relative length unit in CSS, stands for “root em”. It scales relative to the root element’s font size, allowing designs to adapt based on user preferences or device settings. Unlike px, rem units change size if the root font changes.
Conversion FAQs
Can the root font size be something other than 16px?
Yes, the root font size can be changed by CSS on the <html> element. If the root font size is set to a value different than 16 pixels, all rem calculations should divide by that new size instead of 16. This adjustment affects the overall scaling of rem values.
Why use rem instead of px for font sizes?
Using rem for fonts helps maintain scalability and accessibility. Rem units allow text to resize according to user preferences or browser settings. Pixels are fixed, which might cause text to appear too small or large on different devices or for users with visual impairments.
What happens if I use negative pixel values in rem conversion?
Negative pixel values convert to negative rem values by applying the same division formula. While technically allowed, using negative sizes for properties like font size or padding is uncommon and may cause unexpected rendering in browsers.
How precise is the rem conversion from px?
Rem conversions can be very precise when using decimal values, but rounding often occurs because CSS accepts decimal rem units with limited decimal places. The example tool shows rounding to 4 decimal places, which is usually enough for practical design.
Does changing browser zoom affect px to rem conversion?
Browser zoom changes the effective pixel size on screen, but rem units scale with the root font size, which may or may not be affected by zoom depending on the browser. Therefore, px to rem conversion remains consistent in code, but displayed size can vary with zoom.
