5 rem equals 80 pixels (px).
Table of Contents
The conversion is based on the fact that 1 rem usually equals 16 pixels by default in most browsers. Multiplying 5 rem by 16 px/rem gives the total pixels value.
Conversion Tool
Result in px:
Conversion Formula
The formula to convert rem to pixels is:
pixels = rem × base font size in pixels
Web browsers set the base font size usually at 16 pixels. So when you want to convert rem units to pixels, you multiply the rem value by 16. This works because rem units are relative to the root element font size, which by default is 16px unless changed by CSS.
Example with 5 rem:
- Start with the value in rem: 5 rem
- Multiply by base font size: 5 × 16 = 80
- Result is 80 px
Conversion Example
- 3 rem to px:
- 3 rem × 16 = 48 px
- So, 3 rem equals 48 pixels.
- 7.5 rem to px:
- 7.5 × 16 = 120 px
- Therefore, 7.5 rem is 120 pixels.
- 0.25 rem to px:
- 0.25 × 16 = 4 px
- Meaning 0.25 rem equals 4 pixels.
- 12 rem to px:
- 12 × 16 = 192 px
- Thus, 12 rem converts to 192 pixels.
Conversion Chart
| Rem | Pixels (px) |
|---|---|
| -20.0 | -320 |
| -15.0 | -240 |
| -10.0 | -160 |
| -5.0 | -80 |
| 0.0 | 0 |
| 5.0 | 80 |
| 10.0 | 160 |
| 15.0 | 240 |
| 20.0 | 320 |
| 25.0 | 400 |
| 30.0 | 480 |
This chart helps you quickly find pixel equivalents for rem values between -20 and 30. Simply multiply the rem number by 16 to get pixels. Negative rem values correspond to negative pixels, which can be useful in CSS for positioning or offsets.
Related Conversion Questions
- How many pixels are 5 rem in CSS?
- Converting 5 rem to pixels, what is the exact value?
- What is the pixel equivalent of 5 rem with default font size?
- If root font size changes, how does 5 rem convert to px?
- Is 5 rem always equal to 80 pixels in browsers?
- How do I calculate 5 rem in px for responsive design?
- What does 5 rem mean in pixels when base font is 16px?
Conversion Definitions
rem: A CSS unit representing the font size relative to the root element. Rem stands for “root em”, it scales based on the root font size, allowing consistent sizing across a webpage regardless of the inheritance from parent elements.
px: The pixel unit in CSS, represents a single dot on the screen. Pixels are absolute units used for precise control over layout and dimensions, defined relative to the screen’s resolution and density.
Conversion FAQs
What happens if the root font size is changed from 16px?
If the root font size changes, the rem to px conversion changes too. For example, if the root is 20px, 5 rem would be 100px instead of 80px. Rem units always multiply by the current root font size, so the conversion depends on that value.
Can rem values be negative and how does that affect px?
Yes, rem can be negative in CSS, which means negative pixel values after conversion. This is useful for positioning elements off-screen or creating offsets. For instance, -5 rem equals -80 pixels if the base font size is 16px.
Why use rem instead of px for font sizes?
Using rem provides scalability and accessibility. Since rem depends on root font size, it allows easy resizing across entire pages with a single change. Pixels are fixed and do not scale with user preferences or zoom settings.
Does every browser use 16px as default root font size?
Most browsers default to 16 pixels for root font size, but users or CSS reset styles can change it. Because rem units rely on this root, the actual pixel value can vary if the root font size is altered.
How precise is the conversion from rem to px?
The conversion is exact as long as the root font size is known. Since rem is a multiple of that base size, multiplying rem by the root font size gives the precise pixel value, often represented with decimals for fractional rem values.