Pixel art is fun, and isometric pixel art looks great when done properly. My friend Rex informs me that, unlike “real” isometric art which uses an angle of \(30^\circ\) (\(\pi/6\) radians), pixel isometric art uses a ratio of two-pixels-along-per-pixel-up, which is a slightly lower angle. Rex then wanted to know how high (in pixels) he should draw the edge of a cube if he’s already drawn it some number of pixels wide. Here is the answer.
(tl;dr: Multiply by 0.8944.)