Finding the right size of personal planner inserts is usually the first big hurdle when you're building a system that actually works for your daily life. It's easy to get sucked into the beautiful world of planners and then realize you've bought a stack of paper that doesn't actually fit your binder or your handwriting style. We've all been there—staring at a screen wondering if "Personal Wide" is actually different from "Personal" and whether an A5 is too heavy to carry in a purse.
Choosing the right dimensions isn't just about what looks pretty on Instagram. It's about how much space your brain needs to dump all those tasks and whether you're actually going to carry the thing with you. If it's too small, you'll feel cramped; if it's too big, it'll stay on your desk gathering dust while you forget your appointments.
Why A5 is the Gold Standard for Busy People
If you have big handwriting or a schedule that's packed from 6:00 AM to midnight, the A5 size of personal planner inserts is probably going to be your best friend. In the planner world, A5 is roughly half of a standard sheet of printer paper (5.8 x 8.3 inches). It's the sweet spot for people who need to manage both work and home life in one place.
The beauty of A5 is the real estate. You can actually fit a full-day schedule on one page without feeling like you're writing in microscopic font. It's also the easiest size to DIY. Since it's exactly half of an A4 sheet, you can print your own inserts at home, slice the paper in half, and you're good to go. The only real downside? It's chunky. If you use a ring-bound A5 planner, it's going to take up a significant amount of room in your bag. It's more of a "desk companion" than a "carry-everywhere" tool for most people.
The Mystery of the "Personal" Size
When you hear people talk about the "Personal" size, they aren't just being vague—it's a specific industry standard. This size of personal planner inserts usually measures around 3.75 x 6.75 inches. It's thinner and taller than you might expect, which makes it incredibly portable.
For a long time, this was the go-to size for brands like Filofax. It's narrow enough to fit in most medium-sized handbags, yet tall enough to hold a decent list of to-dos. However, some people find it a bit restrictive. If you like to use stickers or washi tape, you might find that the narrow columns don't give you much room to breathe. But if you're a list-maker who just needs to jot down "buy milk" and "call the dentist," the Personal size is a classic for a reason.
What about Personal Wide?
Lately, the "Personal Wide" size has been trending in the planner community. It keeps the height of the Personal size but adds about an inch of width. It's basically the answer to the prayer of anyone who loved the portability of a Personal planner but hated the cramped writing space. It's a bit of a niche size, so you might have to look harder for specific inserts, but it's a fantastic middle ground.
Getting to Know the B6 and A6 Options
If you're looking for something that feels more like a notebook and less like a filing cabinet, the B6 size of personal planner inserts is a fantastic choice. B6 (5 x 7 inches) has become a cult favorite over the last few years. It feels incredibly balanced—not too skinny, not too tall. It's wide enough for decorative planning but small enough that it doesn't feel like a burden to carry.
Then you have the A6. This is significantly smaller (4.1 x 5.8 inches). It's basically a postcard size. I've found that A6 is perfect for people who use their planners primarily for "rapid logging" or quick bullet points. If you try to write long, flowery journal entries in an A6, you're going to run out of space fast. But for a portable "brain dump" book? It's hard to beat.
The Tiny Travelers: Pocket and Mini Sizes
For the true minimalists, we have the Pocket (3.2 x 4.7 inches) and Mini (smaller still) sizes. Choosing this size of personal planner inserts is a bold move. You really have to be intentional about what you write down.
These are great for: * Shopping lists and errands. * Quick habit tracking. * A "wallet" style setup where your planner also holds your credit cards.
If you have large handwriting, skip these. You'll spend more time frustrated by the lack of space than actually being productive. But if you're the type of person who wants their planner to fit in a coat pocket, this is your lane.
How Rings and Discs Affect Your Choice
It isn't just the paper size you have to think about; it's the binding. The physical size of personal planner inserts remains the same, but the hole punching changes everything.
If you're using a ring-bound system (like Filofax or Moterm), those rings take up space on the inner margin. You'll notice that most inserts have a wider margin on the left or right to account for the holes. If you buy "undated" inserts that aren't specifically designed for rings, you might end up punching holes right through your text.
Discbound systems (like Happy Planner or Levenger) are a bit more forgiving with space, but the "mushrooms" (the punch shapes) go deeper into the paper than standard round holes. Always check that the inserts you're eyeing have enough "gutters" (the empty space near the holes) so your writing stays legible.
Measuring Your Current Planner
If you already have a cover and you're just looking for new paper, don't guess. Seriously, get a ruler. The difference between "Personal" and "A6" is small enough that it's easy to mix them up in photos, but they are absolutely not interchangeable.
Measure the height and width of a page that currently fits your planner. If you're starting from scratch and don't have a cover yet, I usually recommend printing out a few "test pages" on regular paper. Cut them to the size of personal planner inserts you're considering and try writing on them for a day. You'll know within ten minutes if a size is too small for your hands or too big for your desk.
Where to Buy and What to Look For
Once you've settled on a size, the world is your oyster—or at least, the internet is. You can find these inserts everywhere from high-end stationary shops to independent designers on Etsy. When you're shopping, keep an eye on the paper weight.
Since you'll be flipping these pages often, you want something sturdy. Look for 100gsm or 120gsm paper if you use fountain pens or heavy markers. There's nothing worse than finding the perfect layout only to realize your pen bleeds through to the other side, effectively ruining half of your planner.
Making the Final Call
At the end of the day, the best size of personal planner inserts is the one you actually use. Don't feel pressured to buy an A5 just because it looks like a "serious" work planner if you know you'd prefer something small and cute that fits in your pocket.
Planners are deeply personal. Some people need a massive canvas to map out their entire lives, while others just need a tiny scrap of paper to remember when their next meeting is. Start with what feels most natural to your writing style, and don't be afraid to experiment. Most of us go through a few different sizes before we find "the one," and that's just part of the process. Whether you go with a tiny Pocket size or a sprawling A5, the goal is the same: getting those thoughts out of your head and onto the page.