1.5 Rem to Px – Easy Conversion Explained

1.5 rem equals 24 pixels (px) when the root font size is 16px.

The conversion from rem to px depends on the root font size of the webpage, which is commonly 16 pixels by default in most browsers. Multiplying the rem value by this root size gives the equivalent pixel value.

Conversion Tool

Conversion Formula

The formula to convert rem to px is:

pixels = rem × root font size

The “rem” unit is relative to the root element’s font size, which is usually 16px by default. So, to get the pixel value, multiply the rem value by 16.

For example, converting 1.5 rem:

• Take the rem value: 1.5
• Multiply by root font size (16px): 1.5 × 16 = 24
• Result is 24 pixels

Conversion Example

• 2 rem to px:
  • Start with 2 rem
  • Multiply by 16 (root font size): 2 × 16 = 32
  • Answer: 32 pixels
• 0.75 rem to px:
  • Begin with 0.75 rem
  • Multiply by 16: 0.75 × 16 = 12
  • Result: 12 pixels
• 3.2 rem to px:
  • Use 3.2 rem
  • Multiply by 16: 3.2 × 16 = 51.2
  • Result is 51.2 pixels
• 0 rem to px:
  • 0 times anything is 0
  • 0 × 16 = 0 pixels
  • So, 0 rem equals 0 px
• 4.5 rem to px:
  • Multiply 4.5 by 16: 4.5 × 16 = 72
  • Result: 72 pixels

Conversion Chart

The table below list rem values from -23.5 up to 26.5 and their equivalent pixel values, assuming the root font size stays 16px. To find the px value for any rem, find the rem in the left column and check the corresponding px on the right.

Related Conversion Questions

• How many pixels equals 1.5 rem on a mobile device?
• What is the pixel value if 1.5 rem is used with a different root font size?
• Can 1.5 rem be converted to px when the root font size is changed?
• Why does 1.5 rem sometimes not equal 24 px in certain browsers?
• How to calculate the pixel equivalent of 1.5 rem in CSS?
• Is 1.5 rem always 24 pixels regardless of user settings?
• What happens to 1.5 rem in pixels if root font size is 20px?

Conversion Definitions

rem: A CSS unit stands for “root em”, measuring relative size to the root element’s font size. It allows consistent scaling of elements independent from parent containers, making layouts flexible and easier to maintain across different screen sizes and user settings.

px: A pixel (px) is a fixed unit representing a single dot on the screen. It’s an absolute measure used in digital displays to define precise sizes for elements, images, and fonts, giving designers exact control over how content appears on various devices.

Conversion FAQs

Does the root font size always have to be 16 pixels?

No, the root font size can be changed by the user or set in CSS. Many browsers default to 16px, but if a developer changes the root font size, then the rem conversion changes too. This means 1.5 rem won’t always equal 24px if the root size changes.

Why would I use rem instead of px in my CSS?

Using rem allows elements to scale relative to the root font size, making the design more responsive and accessible. If a user changes their default font size for readability, rem-based sizes adapt accordingly, unlike fixed pixel units that stay static.

Can rem values be negative and what does that mean?

Technically yes, rem values can be negative but using negative sizes for width or height usually causes layout issues or no visible effect. Negative rem values might be used for certain CSS transforms or offsets, but they don’t represent physical sizes.

How does browser zoom affect rem to px conversions?

Browser zoom changes the effective root font size. If zoomed in, the browser scales the root size, so 1 rem visually becomes larger in pixels. This means rem adjusts dynamically to zoom, while px units stay fixed, which can affect layout appearance.

Is the conversion from rem to px the same on all devices?

While the formula stays constant (rem × root font size), devices with different default font sizes or user settings might produce different pixel results. Also, high-DPI screens can render pixels differently visually, but the numeric conversion remains the same.