1.5 rem equals 24 pixels (px) assuming the root font size is 16px.
The conversion from rem to px depends on the root element’s font size, which is commonly 16px in most browsers. Multiplying 1.5 by 16 gives the pixel value.
Conversion Tool
Result in px:
Conversion Formula
The formula to convert rem to px is:
Pixels (px) = rem value × root font size (in px)
This works because rem units are relative to the root element’s font size. Usually, browsers set the root font size to 16px by default, so multiplying rem by 16 converts it to pixels exactly.
For example, 1.5 rem to px:
- Identify root font size: 16px
- Multiply 1.5 × 16 = 24
- Result: 24px
Conversion Example
- 2 rem to px:
- Root font size assumed 16px
- 2 × 16 = 32px
- Answer: 32 pixels
- 0.75 rem to px:
- Root font size 16px
- 0.75 × 16 = 12px
- Answer: 12 pixels
- 3.25 rem to px:
- Multiply 3.25 × 16
- 3.25 × 16 = 52px
- Result is 52 pixels
- 1 rem to px:
- 1 × 16 = 16px
- Simple direct conversion
Conversion Chart
The table below shows values from -23.5 rem up to 26.5 rem converted into pixels. You can read across the rows to see rem values and corresponding pixel values. Use this chart when quick reference needed without calculation.
| rem | px |
|---|---|
| -23.5 | -376 |
| -20 | -320 |
| -15 | -240 |
| -10 | -160 |
| -5 | -80 |
| 0 | 0 |
| 1 | 16 |
| 5 | 80 |
| 10 | 160 |
| 15 | 240 |
| 20 | 320 |
| 23.5 | 376 |
| 26.5 | 424 |
Related Conversion Questions
- How many pixels are in 1.5 rem if the base font size is 18px?
- What is the pixel equivalent of 1.5 rem in CSS?
- Does 1.5 rem always equal 24px or can it change?
- How to calculate px from 1.5 rem when root font size modified?
- What does 1.5 rem convert to in pixels on mobile devices?
- Is 1.5 rem bigger than 24px when browser zoom applied?
- How do I convert 1.5 rem to px in JavaScript?
Conversion Definitions
rem: rem stands for “root em”, a CSS unit relative to the font size of the root element, typically the <html> tag. It allows consistent scaling throughout a webpage, regardless of nesting, making it easier to maintain responsive typography and layouts.
px: px means pixels, a fixed unit of measurement representing a single dot on a screen. Pixels do not scale with font size or user preferences; they offer precise control over element sizes in digital designs, but can cause accessibility issues if not used carefully.
Conversion FAQs
Can the root font size affect rem to px conversion?
Yes, rem units depend on the root font size set in the browser or CSS. If the root font size changes from the default 16px, the pixel value for 1.5 rem will change accordingly. For example, if root font size is 20px, 1.5 rem equals 30px instead of 24px.
Why use rem instead of px in web design?
rem units adapt better to user settings and improve accessibility. They scale based on root font size, making layouts more flexible across devices and user preferences. Pixels are fixed and do not scale, which can cause text or elements to appear too small or large on different screens.
How to find current root font size in browser?
You can inspect the <html> element in developer tools to see its computed font size. Browsers often default to 16px, but CSS can override this. Knowing the root size helps convert rem to pixels correctly.
Does browser zoom affect rem to px conversion?
Browser zoom scales the entire page, so although rem to px conversion stays mathematically the same, the rendered size changes visually. This means 1.5 rem may appear larger or smaller depending on zoom, but the conversion formula doesn’t change.
Is negative rem values valid in CSS and how do they convert?
Negative rem values can be used in CSS for positioning or margins. Their px equivalent is negative as well, calculated the same way by multiplying by root font size. For example, -1.5 rem equals -24px if root font size is 16px.
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