GloSize

A size chart needs to do two things: open in a popup on the product page, and switch units. GloSize is built around those two. You set the units on the column itself, in the grid where you type the values: centimeters to inches, kilograms to pounds, or the reverse. Weight works the same way length does. Build the table once, assign it to products or a whole collection, and update it in one place. Setup happens in the theme editor, and no theme code is changed.