VH to REM Converter REM Converter Viewport Height to REM Units.

The development of responsive sites is demanding in terms of flexibility. As screens can now come in an infinite size, flex units are employed by web designers like VH (Viewport Height) and REM (Root EM) to provide flex and consistency in the layouts. However, such a conversion between the two units can be inconvenient – and it is where our VH to REM Converter will come in handy.

An easy-to-use web-based calculator would instantly translate the viewport height (VH) measure into root em (REM) measure, which is easily applicable in developing scalable, accessible and friendly-to-use web designs.

What Is a VH to REM Converter?

VH to REM Converter helps the designers and developers to quickly transform the values of viewport height to the values of the root font size.

VH is applied to offer sizes of an element depending on the visible height of the browser in responsive web design and REM is applied to offer sizes depending on a base font size set in the HTML root element.

By making VH REM, the adjustment of layouts to flexibly support screen size as well as font preferences of the user will be possible thus enabling the achievement of the same and equally readable and aesthetically balanced layout.

Learning about VH and REM Units.

At this point, it is time to take a glimpse of what each of the units implies:

1. Viewport Height (VH)

1 VH = 1 percent of the height of the view port of a browser.

An example is that 1 VH will correspond to 9 pixels in case the viewport height is 900 pixels.

VH automatically varies as the size of the browser window varies.

2. Root EM (REM)

1 REM = the size of font of the root element in the html.

CSS allows changing the default root font size to 16px, but it is changeable in the majority of browsers.

The REM units render your site homogeneous since they are scaled relative to this size of root and not the parent element.

The other consequence of REM is a more predictable design and the far simpler process of maintenance especially where accessibility or font size control is concerned.

VH to REM Conversion Formula

VH to REM is not very difficult, knowing the number of pixels in a viewport and root font size.

Here’s the formula:

REM = ( Viewport  Height  in  Pixels x VH  Value)/100)/Root  Font  Size  in  Pixels.

Step-by-Step Breakdown:

Determine the height of the viewport in pixels (e.g. window.innerHeight in JavaScript).

Multiply height with your VH value then divide it with 100 to get pixel value.

Take the value of such pixel divided by the size of your root font as the value in Rems.

Example Conversion

Let’s say:

Viewport height = 800px

Root font size = 16px

You want to convert 10 VH to REM

Step 1: 10 VH = 10% of 800px = 80px

Step 2: 80px ÷ 16px = 5 REM

Result: 10 VH = 5 REM

This would then give you a 10 VH container that would give you an equivalent 5 REM with an 800 pixel viewport and 16 pixel root font.

Conversion of the VH to the REM Converter.

In order to turn VH to REM in real time with our online service, just follow the few steps below:

Step 1: Enter the VH Value

Type in the quantity of VH units that you would like to convert e.g. 10.

Step 2: Type Viewport Height (Optional)

You can also add your current viewport in pixels in this case you know it to achieve the correct results.

Step 3: Set Root Font Size

The default font size is 16px though when you want to have a base font of your own preference (18px or 20px) then just enter that number.

Step 4: Get Instant Conversion

Click on convert or press enter. The equivalent value of the REM will be automatically displayed using the tool.

Step 5: Apply to Your CSS

Type the value of the REM into your code or stylesheet.

That’s it! Just now you have automatically changed VH into REM.

VH to REM Conversion Table

The table below provides a quick reference for common VH to REM conversions, assuming a default viewport height of 1000px and a root font size of 16px.