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1.5 rem is equal to 24 pixels (px).
This is calculated by multiplying the rem value by the root font size, which is generally 16px in most browsers. So, 1.5 rem × 16 px equals 24 px, giving you the pixel equivalent of the rem unit.
Conversion Tool
Result in px:
Conversion Formula
Rem units convert to pixels by multiplying the rem value with the root font size, which is commonly 16 pixels by default in browsers. This means the formula is:
pixels (px) = rem × root font size (px)
It works because rem stands for “root em,” which scales relative to the font size set on the root element (<html>). For example, if the root font size is 16px, then 1 rem means 16 px.
Example calculation for 1.5 rem:
- Start with rem value: 1.5
- Root font size: 16px
- Multiply: 1.5 × 16 = 24 px
Conversion Example
- 2 rem to px
- Take the rem value 2
- Multiply by 16 (root font size)
- 2 × 16 = 32 px
- 0.75 rem to px
- Start with 0.75
- Multiply with 16
- 0.75 × 16 = 12 px
- 3.25 rem to px
- Use 3.25
- Multiply by 16
- 3.25 × 16 = 52 px
- 0 rem to px
- Zero rem means zero pixels
- 0 × 16 = 0 px
- -1 rem to px
- Negative rem is allowed in CSS
- -1 × 16 = -16 px
Conversion Chart
The chart below shows rem values from -23.5 to 26.5 converted into pixels by multiplying each rem value with 16. You can read across to find the equivalent pixels for any rem value in that range.
| Rem | Pixels (px) |
|---|---|
| -23.5 | -376.00 |
| -20 | -320.00 |
| -15 | -240.00 |
| -10 | -160.00 |
| -5 | -80.00 |
| -1 | -16.00 |
| -0.5 | -8.00 |
| 0 | 0.00 |
| 0.5 | 8.00 |
| 1 | 16.00 |
| 1.5 | 24.00 |
| 2 | 32.00 |
| 5 | 80.00 |
| 10 | 160.00 |
| 15 | 240.00 |
| 20 | 320.00 |
| 26.5 | 424.00 |
Related Conversion Questions
- How many pixels are 1.5 rem in CSS design?
- What is the pixel size for 1.5 rem if the root font size changes?
- Does 1.5 rem always equal 24 px on every browser?
- How to convert 1.5 rem to px when root font size is 18px?
- Why is 1.5 rem sometimes different in pixels on mobile devices?
- Can 1.5 rem be a fractional pixel value when converted?
- Is 1.5 rem bigger or smaller than 24px in visual size?
Conversion Definitions
rem: A CSS unit standing for “root em,” rem is relative to the root element’s font size, typically set in the <html> tag. Unlike em units, rem always scales consistently across elements, making layout and typography easier to control when font sizes change.
px: Pixels are absolute units in screen resolution, representing a single point on the display. It’s the most direct measurement for screen elements, unaffected by user settings or scaling, but can cause issues with accessibility and responsive design if used without relative units.
Conversion FAQs
What happens if the root font size is changed from 16px?
If the root font size differs, the px equivalent of rem changes too. For example, if root font size is 20px, then 1.5 rem equals 30 px (1.5 × 20). This makes rem flexible but depends on the root’s font-size setting.
Can rem values be negative and still convert to pixels?
Yes, rem values can be negative in CSS, resulting in negative pixel values after conversion. This can be used for positioning or offsets, but negative sizes for font or element dimensions are invalid and won’t render properly.
Why use rem instead of px for font sizes?
Using rem allows font sizes to scale with the root element, improving accessibility and responsiveness. Users can adjust root font size in browsers, and all rem-based sizes adapt accordingly, unlike fixed px units.
Is 1.5 rem always exactly 24 px on every device?
Not necessarily. It depends on the root font size and device’s scaling. Most browsers use 16px root font size by default, so 1.5 rem equals 24 px, but if the root font size changes or zoom level differs, pixel value changes.
How precise is the rem to px conversion with decimal values?
Conversions with decimal rem values result in decimal pixel values, which browsers can render accurately. For example, 1.25 rem equals 20 px (1.25 × 16), and fractional pixels are used in rendering to keep smoothness in layout and text.
