First you need to determine what size curtain you need for your window. You’ll need a “base” (or a piece that covers the whole curtain), and you’ll need to cut strips for the ruffles.
Determine how many rows of ruffles you want, then measure the length of the curtain and add 2 inches for each ruffle. Divide the number of ruffles by the total inches to figure out how long you want the ruffles. Your ruffle fabric should be 4x the width of the base, so that you have plenty of gathering room. Confusing enough? Welllll… I just eyeballed it. No joke. I’m way too lazy to do all that math (I do have an English degree, after all 🙂
Looking for more curtain ideas? You can find them in my DIY Curtain Ideas Gallery