Is there a way to have pi in a CSS calc?

Question

I have an SVG circle animation for a progress bar where the stroke-dashoffset is animated from 0,radius to radius,0 (for 0% to 100%).

The equation for the length of the circumference of a circle is pi * d. Is there a way to use a CSS calc function where it can use a value of pi, rather than just a rounded value (like 3.14)?

Answer 1

There's no such thing as a PI variable in CSS, unfortunately.

However..

You can make use of CSS variables to assign a number to it, downside to this is that it has a really, really bad browser support. Well, not any more

This would work like:

:root {   --PI: 3.14159265358979; // enter the amount of digits you wish to use }  .circle {     width: calc(100 * var(--PI)); } 

The best solution would be to use a preprocessor such as SASS or Less to assign the PI variable to, this would look like the following example in SASS:

$pi: 3.14159265358979 // amount of digits you wish to use  .circle {     width: calc(100 * ${pi}); } 

EDIT: As mentioned in the comments, some browsers (Safari + IE) round to 2 decimals, where Chrome and Firefox can round up to (at least) 4 decimals.