DIY New Circle Skirt App from By Hand London here. The actual app is here. What I really like about this app is after you plug all your data in the app tells you the fabric length required:
with a note to say whether it will fit on a standard 45″ / 115cm width fabric…or whether you’d be better off using a 60″ / 150cm width fabric…or perhaps even just going with a shorter skirt length.