From time to time, you might need to convert pixels to vw-units, and vice-versa.

It is fairly simple.

Hopefully, the examples shown below are self-explanatory.

The basic formula (in computer-style notation is:

vw = px * (100 / 1920) where 1920 is the screen width in pixels
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In conventional notation:

vw = px x 100
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1920

px = vw x 1920
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100

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Examples
e.g. pixels = 80

vw = (80 x 100) / 1920
= 8000 / 1920
= 4.166666667
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e.g. vw = 4.166666667

px = (4.166666667 x 1920) / 100
= 8000 / 100
= 80
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However, if you have a number of conversions to do, manual conversion can be a bit tedious and time-consuming. So I have written a little app to do it automatically: