In this video I’m getting super practical about spiral/coil binding—specifically what coil length you actually need when you’re binding A4 paper. If you’re like me and you’re rebinding homeschool books, printing curriculum, or making your own planners, the coil size can be the one thing that trips you up. I’m using my TruBind TB‑S20A and walking through the simple way I decide what length coil to buy so I’m not wasting money or ending up with coils that are too short (or way too long and messy). I’m sharing this from the “mom life + homeschool DIY” perspective, because I’m not binding one cute notebook—I’m binding stacks of pages and I want it to turn smoothly, lay flat, and hold up to real use from kids. I also mention the other tools I pair with this setup, like my heavy duty guillotine cutter, because clean cuts and consistent page sizing make binding so much easier. If you’re binding A4 sheets and you want a quick, confident answer on coil length, this video is for you.