Can you help me understand how to convert PX into REM for my typography? I came across Jonathan Snook's article on utilizing REM units, but I'm a bit confused about his suggestion of using font-size: 62.5% as a base for conversion (setting the default font size to be 10px for easier calculations). How would I go about converting my PX values into REM if I wanted to use other percentages like 100%, 75%, and more?
Calculating Target Size / Base Size = ValueAssuming a default of 16px for browsers (similar to Jonathan Snook's assumption that 62.5% equals 10px), your base size is 16. For 32px, the calculation would be 32 / 16 = 2, for 40px it would be 40 / 16 = 2.5, and for 24px it would be 24 / 16 = 1.5.
The same principle applies for 75%. Determine what 75% translates to (which is 12) and apply the same formula. For 32px, the calculation is 32 / 12 = 2.666, for 40px it is 40 / 12 = 3.333, and for 24px it is 24 / 12 = 2.
By simply integrating the following code into your stylesheet:
html {
font-size: 62.5%;
}
You can effortlessly convert 1 rem to equal 10px. This means you will now be operating on a 10px base. Therefore,
body {
font-size: 1.6 rem;
}
Your font size will then be calculated as 1.6*10=16 px.
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