Nice idea. I love how you manage to show the shapes of the design. But how do you know the size of the finished object? I assume you ask knitters to do the calc

Nice idea. I love how you manage to show the shapes of the design. But how do you know the size of the finished object? I assume you ask knitters to do the calculations themselves. That can be difficult (for me it was until I put words on it). Being a long time knitter and also a designer (not a professional designer, but just someone that likes to design her own patterns and doesn't like to follow other patterns), I did several knitting tools using LibreOffice Calc (may be you can call that "old school"), you can download them here: https://www.aiguilles-magiques.com/-Outilsde-creation-?lang=fr https://www.aiguilles-magiques.com/-Outilsde-creation-?lang=... Sorry but they are mainly in French. Well, the sweater calculator is in English too. For these tools, I just ask the knitter to enter the gauge and, yes, all the necessary measurements. The sheets make all the maths. Obviously there are way perfectible, and they don't show the shape of the finished as you did for your tool (notice the picture on y tools were made with Inkscape). All this tools are under licence CC by-sa.