If you’re not sure what page size planner is right for you, this post will give you some things to consider.

I’ve used the Happy Planner for reference as it comes in the 3 main sizes you can find most planners in: small, medium and big.

Quick size reference

Mini = 5.5″ wide x 7.5″ high.
Classic = 7.75″ wide x 9.75″ high (the actual planner pages are 7″ wide x 9.25″ high)
Big = US letter size 8.5″ wide x 11″ high

Mini Happy Planner

The mini is my favorite small planner. Most planners don’t come in this size, or if they do they’re ring bound or travellers notebook style.

Use the mini Happy Planner if:

You don’t have much to plan – small page size + small writing space + small discs (although you could replace them with bigger discs to fit more pages)
Want the cheapest Happy Planner
Prefer lined writing space
Like to use stickers
You rarely use a monthly calendar (as the boxes are so small)
You prefer to work off to do lists and don’t need much space for weekly planning (i.e. only use the weekly spread for appointments)
If you use 2 planners at once – the mini is ideal for health and fitness tracking, work planning, checklists
If you need a lightweight and portable planner
If you combine digital and paper planning e.g. keep a master task list in Excel and then use your planner for appointments and reminders only
If you want to use a generic layout i.e. horizontal

Classic Happy Planner

This is my favorite Happy Planner page size. Just the right amount of space without being too big, bulky and heavy.

Use the classic Happy Planner if:

If you want a different weekly spread – the classic comes in the usual vertical, horizontal and hourly but also color block & Super Mom
There are more refill inserts (and half sheet inserts) at classic size than the mini and big
Just the right amount of space without being too heavy or the page size too big
Option for 12 month or 18 month planner
You want to do hourly planning (the mini is too small)
You like to do sticker decorating – most planners come in a page size similar to the MAMBI classic so the stickers tend to be interchangeable or can be trimmed slightly to fit
Students – the page size is just right and not too heavy to carry around

Big Happy Planner

I don’t use the big Happy Planner… it’s far too big (US letter page size). Bigger page size + lots of pages = very heavy.

Use the Big Happy Planner if:

Family planning
You have big handwriting
Your planner stays at home on your desk
You like to print your own printables and don’t have a printer that can resize pages (tutorial here so you can test your printer)
Option for 12 month or 18 month planner
You want to do hourly planning

Happy Notes

If you like bullet journaling or just want a notebook to accompany your planner, my favorite Happy Planner product is the Happy Notes notebooks. They come in lined, graph and dot grid inside pages. They also come in the mini, classic, half sheet classic (my favorite for lists) and big page sizes.