Instantly convert REM to Percentage and Percentage to REM

A simple and fast tool to convert REM units to Percentage values and vice versa for your web designs.

px
px
rem
%

How to Convert REM to Percentage

 

 

Step 1: Understand the Relationship

The `rem` unit is directly proportional to the parent’s font size. Therefore, 1rem is always equal to 100% of the parent’s font size.

Step 2: Use the Conversion Formula

The formula to convert REM to a percentage is simply to multiply the REM value by 100.

Result in % = REM Value * 100

Step 3: Example Calculation

If you want to convert 1.5rem to a percentage, the calculation is:

1.5 * 100 = 150

So, 1.5rem is equal to 150% of the parent’s font size.

Common REM to Percentage Reference

A quick reference table for converting REM to Percentage.

REM Percentage
0.5rem 50%
0.75rem 75%
1rem 100%
1.25rem 125%
1.5rem 150%
2rem 200%
2.5rem 250%
3rem 300%
4rem 400%
5rem 500%

REM to Percentage Converter Information

 

Understanding REM Units

The `rem` unit is a relative unit of measurement in CSS. It is relative to the font-size of its direct parent element. This makes it powerful for creating components that scale within themselves, but can sometimes lead to complex calculations in nested elements.

Understanding Percentages (%)

The percentage (%) unit is a relative unit of measurement in CSS. It defines a size or length relative to the same property of its parent element. For font-size, a percentage is relative to the parent’s font-size, making it directly equivalent to the `rem` unit (e.g., 1.5rem = 150%).

Why Convert REM to Percentage?

While `rem` and `%` are often interchangeable for font-size, converting between them can be useful for clarity and consistency in your code. This is helpful for:

  • Code Readability: Some developers find percentages more intuitive than decimal `rem` values when thinking about font scaling.
  • Maintaining a Consistent Unit: If your project’s coding standards prefer percentages for all relative sizes, converting `rem` values helps maintain that consistency.
  • Educational Purposes: Understanding that 1em is 100% is a fundamental concept in CSS, and this converter helps to illustrate that relationship clearly.