78 px is equal to 4.875 rem.
To convert pixels to rem, you divide the pixel value by the root font size, which is commonly 16px in web browsers. So, 78 pixels divided by 16 results in 4.875 rem. This allows scalable sizing relative to the root font, making designs more flexible.
Conversion Tool
Result in rem:
Conversion Formula
The formula to convert px to rem is simple: rem = px ÷ root font size. The root font size is the base font size of the webpage, often set at 16 pixels by browsers, but it could be different if customized.
This works because rem units scale relative to the root font size, allowing elements to resize consistently across devices. By dividing the pixel value by the root font size, you get a value in rem units that maintain proportionality.
Example: Convert 78 px to rem with a root font size of 16 px:
- Start with pixel value: 78 px
- Divide by root font size: 78 ÷ 16 = 4.875
- The result is 4.875 rem
Conversion Example
Let’s convert 64 px to rem, step-by-step:
- Identify the root font size: 16 px (default browser setting)
- Take the pixel value: 64 px
- Divide pixel value by root font size: 64 ÷ 16 = 4
- Result: 4 rem
- This means 64 pixels equals 4 rem, which scales with root font size changes.
Another example with 100 px:
- Root font size is 16 px
- 100 ÷ 16 = 6.25
- So, 100 px equals 6.25 rem
One more example with 45 px:
- Root font size is 16 px
- 45 ÷ 16 = 2.8125
- Therefore, 45 px converts to 2.8125 rem
Conversion Chart
| Pixels (px) | Rem (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 |
This chart shows pixel values in the left column and their equivalent rem values in the right, assuming a root font size of 16px. You can quickly find rem for any px between 53 and 103 by dividing the px value by 16.
Related Conversion Questions
- How many rem is 78 pixels with a different root font size?
- What happens to 78 px converted to rem on mobile devices?
- Why does 78px equal 4.875 rem in CSS?
- Can I use 78 px as rem without changing root font size?
- How to convert 78 px to rem if root font size is 10px?
- Is 78 px to rem conversion affected by browser zoom?
- What is the CSS code for 78 px in rem units?
Conversion Definitions
px: A pixel (px) is a unit of measurement in digital screens representing a single point in a raster image. It is fixed and absolute, meaning one px equals one dot on the screen, regardless of screen size or resolution. Pixels are used for precise layout control in web design.
rem: Rem stands for “root em” and is a relative unit in CSS that scales based on the root element’s font size (usually the element). Unlike px, rem allows flexible sizing that adjusts when the root font size changes, improving accessibility and responsiveness in design.
Conversion FAQs
Why would I choose rem over px when designing a website?
Using rem units allows your design to scale with the root font size, making it more adaptable to user settings like zoom or accessibility preferences. Pixels are fixed and don’t adjust, which can cause issues on different devices or screen resolutions.
Is the root font size always 16px?
While 16px is the default root font size in most browsers, it can be changed by CSS on the <html> element. If changed, the rem conversion will base off the new root font size, affecting all rem calculations.
Can rem values cause layout issues in older browsers?
Older browsers may have partial or no support for rem units, causing layouts to break or appear inconsistent. However, most modern browsers support rem well. For legacy support, fallback styles using px might be needed.
How do I convert rem back to px?
To convert rem to px, multiply the rem value by the root font size. For example, if root font size is 16px and you have 4 rem, then 4 × 16 = 64 px.
Does browser zoom affect px or rem differently?
Browser zoom scales the entire page, affecting both px and rem visually. However, rem units provide better control at the CSS level for scaling relative sizes, while px units remain fixed until zoom is applied.