A5 or A4 sounds like a small detail, but it changes how a planner actually behaves day to day: how much it weighs in your bag, how much room each entry gets, and how often you’ll bother pulling it out. Here’s how to pick.
A5 if you carry it everywhere
A5 is roughly half the size of A4 and noticeably lighter. It fits in most handbags and slim backpacks without adding real bulk, which matters if your planner comes with you to work, meetings, or out the door most days. The tradeoff is space: each page has less room, so dense daily writers may feel cramped, especially on busy weeks.
A4 if it lives on a desk
A4 gives every page noticeably more breathing room, which suits people who write a lot per day, sketch, or like generous white space. It’s the better choice if your planner mostly stays on a desk at home or in the office rather than travelling in a bag. The size is genuinely bulkier to carry around, so it’s worth being honest with yourself about where the planner will actually spend most of its life.
A quick way to decide
Ask where the planner will physically sit most days. Bag or backpack, most days: A5. Desk, mostly: A4. If you genuinely can’t picture where it’ll live yet, A5 is the safer default, since it still fits comfortably on a desk, but an A4 doesn’t fit comfortably in most bags.
