1.5 rem equals 24 pixels (px) assuming the root font size is 16 pixels.
The conversion from rem to px depends on the root font size set in the browser or CSS. Since 1 rem equals the root font size, multiplying 1.5 by the root font size (commonly 16px) gives the final pixel value.
Conversion Tool
Result in px:
Conversion Formula
The formula to convert rem to px is simple: multiply the rem value by the root font size in pixels. Since 1 rem equals the root font size, you just scale it based on how many rem units you have.
Formula:
pixels = rem × root font size (px)
Example with 1.5 rem:
1.5 rem × 16 px = 24 px
This works because rem units are relative to the root font size, not the size of the parent element. So, if the root font size changes, the pixel value for the same rem changes accordingly.
Conversion Example
- 2 rem to px:
- Multiply 2 by 16 (root font size)
- 2 × 16 = 32 px
- So, 2 rem equals 32 pixels.
- 0.75 rem to px:
- Multiply 0.75 by 16
- 0.75 × 16 = 12 px
- Hence, 0.75 rem is 12 pixels.
- 3.2 rem to px:
- Multiply 3.2 by 16
- 3.2 × 16 = 51.2 px
- Therefore, 3.2 rem equals 51.2 pixels.
- 0 rem to px:
- Multiply 0 by 16
- 0 × 16 = 0 px
- Zero rem is zero pixels.
- 1 rem to px:
- Multiply 1 by 16
- 1 × 16 = 16 px
- One rem equals sixteen pixels.
Conversion Chart
| Rem | Px |
|---|---|
| -23.5 | -376 |
| -20 | -320 |
| -15.7 | -251.2 |
| -10 | -160 |
| -5.5 | -88 |
| -1 | -16 |
| 0 | 0 |
| 1.5 | 24 |
| 3 | 48 |
| 7.25 | 116 |
| 10 | 160 |
| 15 | 240 |
| 20.5 | 328 |
| 23 | 368 |
| 26.5 | 424 |
This chart shows rem values in first column and their pixel equivalents in second. You can find closest rem value and see its px conversion to help you quickly estimate sizes without calculator.
Related Conversion Questions
- How many pixels does 1.5 rem equal if the root font size is 18px?
- What is the pixel value for 1.5 rem in a browser with 20px root font size?
- Is 1.5 rem always the same pixel size on different devices?
- How to convert 1.5 rem to px in CSS when root font size changes?
- Why does 1.5 rem convert to different pixels in various browsers?
- What pixel value corresponds to 1.5 rem if root font size is 14px?
- Can 1.5 rem be used instead of px for responsive design?
Conversion Definitions
rem: The rem unit in CSS means “root em” and measures size relative to the root element’s font size, usually the <html> element. Using rem allows consistent scaling across an entire webpage, independent from the parent elements font size.
px: Px stands for pixels, the smallest unit of measurement on a digital screen. Pixels are absolute units commonly used in web design to define fixed sizes for text, images, and layout elements, providing precise control over appearance.
Conversion FAQs
Does the root font size affect the rem to px conversion?
Yes, the root font size is the base value for rem calculations. If the root font size changes from the default 16 pixels to another value, then the pixel equivalent of 1 rem or any rem unit changes accordingly. For example, with 18px root size, 1.5 rem becomes 27px.
Can rem values become negative, and what does it mean in pixels?
While negative rem values are syntactically allowed, they usually don’t make practical sense for font sizes or spacing. Negative rem values convert to negative pixel values by multiplying with the root font size, but applying negative sizes might break layout or cause unexpected rendering.
Why use rem units instead of px for web typography?
Rem units scale based on the root font size, making designs more flexible and accessible. They let users adjust text size via browser settings easily, improving readability. Pixels are fixed, so they don’t respond to user preferences or device settings as rem units do.
Does the rem to px conversion change in different browsers?
The conversion itself does not change since it depends on the root font size, but browsers might have different default root font sizes or user settings that affect how many pixels 1 rem represents. Most browsers default to 16px, but this can be overridden by users or stylesheets.
How do I find out my current root font size for rem conversion?
You can check the root font size by inspecting the <html> element in browser developer tools. Look for the font-size property, or if not explicitly set, browsers commonly use 16px. This value determines how many pixels each rem unit equals in your environment.