78 px equals 4.875 rem.
Table of Contents
This conversion assumes that the root font size is 16 pixels, which is common in web browsers. To convert pixels to rem units, divide the pixel value by the root font size, here 16. So, 78 pixels divided by 16 equals 4.875 rem.
Conversion Tool
Result in rem:
Conversion Formula
The formula to convert pixels (px) to rem is:
rem = px ÷ root font size
Most browsers set the root font size to 16 pixels by default. So, if you want to convert 78 px to rem, divide 78 by 16:
- Start with: 78 px
- Divide 78 by 16 (root font size)
- 78 ÷ 16 = 4.875
- Result: 4.875 rem
This works because rem units are relative to the root font size, allowing scalable designs that adapt if the root size changes.
Conversion Example
- Example: Convert 48 px to rem
- Take 48 px value
- Divide by 16 (root font size)
- 48 ÷ 16 = 3
- Result is 3 rem
- Example: Convert 120 px to rem
- 120 px divided by 16
- 120 ÷ 16 = 7.5
- Output is 7.5 rem
- Example: Convert 64 px to rem
- 64 divided by root size 16
- 64 ÷ 16 = 4
- Result shows 4 rem
- Example: Convert 90 px to rem
- Divide 90 by 16
- 90 ÷ 16 = 5.625
- Final value is 5.625 rem
Conversion Chart
This chart shows pixel values from 53.0 to 103.0 and their equivalent rem values, using 16 as the root font size. You can use this to quickly find rem without calculating each time.
| Pixels (px) | Rem |
|---|---|
| 53.0 | 3.3125 |
| 58.0 | 3.6250 |
| 63.0 | 3.9375 |
| 68.0 | 4.2500 |
| 73.0 | 4.5625 |
| 78.0 | 4.8750 |
| 83.0 | 5.1875 |
| 88.0 | 5.5000 |
| 93.0 | 5.8125 |
| 98.0 | 6.1250 |
| 103.0 | 6.4375 |
Related Conversion Questions
- How many rem is 78 pixels with different root font sizes?
- What is the rem value of 78 px if base font size changes?
- How to convert 78px to rem for responsive design?
- Is 78 px equal to 4.875 rem always?
- How to calculate rem from 78 pixels manually?
- What happens to 78 px in rem if root font is 14px?
- Why convert 78 px to rem in CSS?
Conversion Definitions
px (Pixels): Pixels are the smallest units of digital images or displays. They represent discrete dots on a screen and are absolute units. Pixels are fixed in size, depending on the screen resolution, and do not scale automatically with user settings or container sizes.
rem (Root Em): rem is a scalable unit in CSS that measures size relative to the root element’s font size. Unlike pixels, rem adapts when the root font size changes, making layouts flexible and accessible. One rem equals the font size set on the root HTML element.
Conversion FAQs
Why does rem depend on the root font size?
rem units are relative to the font size defined on the root element (usually <html>). Changing that root font size will scale all rem-based measurements accordingly, allowing easier control of overall sizing across a page or application.
Can the root font size be different than 16px?
Yes, the root font size can be changed via CSS, like html { font-size: 14px; }. In that case, all rem values adjust based on the new root size, so converting px to rem requires dividing by the actual root size, not always 16.
When should I use rem instead of px in CSS?
rem units are preferred for scalable, accessible designs. Because they respect user settings and zoom, using rem allows text and element sizes to adjust better across devices and user preferences compared to fixed pixel values.
Does converting 78 px to rem always give the same number?
Only if the root font size remains the same. If the root size changes, the rem equivalent of 78 px changes since rem is relative. So, the conversion depends on the root font size at that moment.
What happens if I use rem without setting a root font size?
If you don’t set a root font size, browsers default to 16px for the root element. Thus, rem units calculate based on 16px unless overridden by CSS.