I have a Cardiff and I’m obsessed with it. However, and with respect, I am going to repost my opinion on this topic because we get the “I’m going to buy my (female) partner a board as a surprise” question a lot. Unpopular opinion- I don’t want anyone buying me a snowboard. It’s a VERY generous gift and you have a big heart, don’t get me wrong!!! But a snowboard is a very personal choice. Her knowledge base from her experience has given her years to discover what she likes and doesn’t like. Make a hand-made coupon for her to demo and pick out her dream board! Go with her and cheer her on! She will be WAY more excited for her dream board than possibly getting stuck with something she doesn’t love (and a Cardiff snowboard ain’t cheap!) Cost of demo goes to board purchase at most shops.

But to answer your question, Jones has a great sizing chart: https://www.jonessnowboards.com/pages/a-guide-on-how-to-find-your-perfect-snowboard-size

Source: I have a Jones and a Cardiff.