1.5 rem equals 24 pixels (px) when the root font size is 16px.
The rem unit represents the root element’s font size, which is commonly 16px in browsers. Multiplying 1.5 rem by 16px gives the equivalent pixel value.
Conversion Tool
Result in px:
Conversion Formula
The conversion from rem to px depends on the root font size, which is generally 16 pixels in most web browsers. The formula used is:
pixels (px) = rem × root font size (px)
This works because rem represents a multiple of the root font size, so multiplying the rem number by the font size converts it into pixels.
For example, with 1.5 rem and root font size 16px:
- Multiply 1.5 by 16
- 1.5 × 16 = 24
- So, 1.5 rem equals 24 pixels
Conversion Example
- 2 rem:
- Multiply 2 by 16 (root font size)
- 2 × 16 = 32
- 2 rem equals 32 pixels
- 0.75 rem:
- Multiply 0.75 by 16
- 0.75 × 16 = 12
- 0.75 rem equals 12 pixels
- 3.2 rem:
- Multiply 3.2 by 16
- 3.2 × 16 = 51.2
- 3.2 rem equals 51.2 pixels
- 1 rem:
- 1 × 16 = 16
- 1 rem equals 16 pixels
- 4.5 rem:
- 4.5 × 16 = 72
- 4.5 rem equals 72 pixels
Conversion Chart
The chart below shows rem values from -23.5 to 26.5 and their pixel equivalents, assuming 16px root font size. To find the pixel value, multiply the rem value by 16.
| Rem | Pixels (px) |
|---|---|
| -23.5 | -376.0000 |
| -22.5 | -360.0000 |
| -21.5 | -344.0000 |
| -20.5 | -328.0000 |
| -19.5 | -312.0000 |
| -18.5 | -296.0000 |
| -17.5 | -280.0000 |
| -16.5 | -264.0000 |
| -15.5 | -248.0000 |
| -14.5 | -232.0000 |
| -13.5 | -216.0000 |
| -12.5 | -200.0000 |
| -11.5 | -184.0000 |
| -10.5 | -168.0000 |
| -9.5 | -152.0000 |
| -8.5 | -136.0000 |
| -7.5 | -120.0000 |
| -6.5 | -104.0000 |
| -5.5 | -88.0000 |
| -4.5 | -72.0000 |
| -3.5 | -56.0000 |
| -2.5 | -40.0000 |
| -1.5 | -24.0000 |
| -0.5 | -8.0000 |
| 0.5 | 8.0000 |
| 1.5 | 24.0000 |
| 2.5 | 40.0000 |
| 3.5 | 56.0000 |
| 4.5 | 72.0000 |
| 5.5 | 88.0000 |
| 6.5 | 104.0000 |
| 7.5 | 120.0000 |
| 8.5 | 136.0000 |
| 9.5 | 152.0000 |
| 10.5 | 168.0000 |
| 11.5 | 184.0000 |
| 12.5 | 200.0000 |
| 13.5 | 216.0000 |
| 14.5 | 232.0000 |
| 15.5 | 248.0000 |
| 16.5 | 264.0000 |
| 17.5 | 280.0000 |
| 18.5 | 296.0000 |
| 19.5 | 312.0000 |
| 20.5 | 328.0000 |
| 21.5 | 344.0000 |
| 22.5 | 360.0000 |
| 23.5 | 376.0000 |
| 24.5 | 392.0000 |
| 25.5 | 408.0000 |
| 26.5 | 424.0000 |
Related Conversion Questions
- How many pixels equal 1.5 rem in CSS?
- What is the pixel size of 1.5 rem on a 16px root font?
- Can 1.5 rem be converted to px without a standard root font size?
- How does changing the root font size affect 1.5 rem in pixels?
- Is 1.5 rem always equal to 24 px on all browsers?
- What is the difference between rem and px when converting 1.5 rem?
- How to calculate pixels from 1.5 rem if root font size is not 16px?
Conversion Definitions
rem: rem stands for “root em” and is a relative unit in CSS used to size elements. It measures relative to the root element’s font size, usually the <html> element. This allows consistent scaling of sizes across a webpage, adapting to user preferences or browser defaults.
px: px, or pixel, is an absolute unit representing a single dot on the screen. It’s fixed in size and does not scale with user settings or parent elements. Pixels are the base measurement in screen design, giving precise control over layout and element size.
Conversion FAQs
Does the root font size affect the rem to px conversion?
Yes, rem values depend on the root font size defined in the browser or CSS. If the root font size changes from the default 16px, the pixel equivalent of rem values change accordingly. For example, if root is 20px, then 1.5 rem equals 30 px.
Can rem values be negative, and what does that mean in pixels?
Technically, rem values can be negative, but negative sizing usually doesn’t make sense in CSS as it can cause layout issues. A negative rem multiplied by root font size simply gives a negative pixel value, which CSS might ignore or handle unexpectedly.
Is rem better than px for responsive design?
Rem is preferred for scalability because it adapts to the root font size, which users or devices can adjust. Pixels are fixed and don’t scale, so using rem helps maintain consistent proportions across different screen sizes or user settings.
What happens if the root font size is changed in CSS?
Changing the root font size alters all rem-based sizes site-wide. For example, setting <html> { font-size: 12px; } means 1 rem equals 12 pixels, so 1.5 rem becomes 18 pixels instead of 24. This affects layout and text sizing globally.
Why does 1.5 rem equal 24 px on most browsers?
Most browsers set the default root font size to 16 pixels. Because rem units multiply by this value, 1.5 rem × 16 px gives 24 pixels. However, if a user or site changes this root size, the pixel value will differ.