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How to choose an undated A5 18-month planner to organise your daily life

A standard diary can quickly become unusable as soon as a period is left blank. With an undated A5 18-month planner, you can start whenever you like, pause your organisation if needed, and plan a career change without wasting pages.

However, not all models are created equal. A pretty cover can hide paper that is too thin, an impractical binding, or a layout limited to a single weekly view. Here are the criteria to consider before buying an A5 planner, along with a selection suited to different needs.

Common pitfalls when buying an undated diary

1. Confusing the number of pages with the duration of use

A diary with a large number of pages does not necessarily cover 18 months of planning. You need to distinguish between leaves — which make up two pages — and check how the space is divided between monthly views, weekly views and note pages.

A well-designed model should detail the different planning formats it offers. For versatile use, look for:

  • a customisable introductory page;
  • undated monthly double-page spreads;
  • undated weekly double-page spreads;
  • dedicated spaces for notes or goal tracking.

2. Relying solely on the cover's appearance

A smart finish does not guarantee the diary will withstand daily handling. For work or study, a hard cover protects the pages better in a bag, on a desk or during commutes. Also consider the weight, the quality of the binding and whether it has a closure system.

A ribbon page marker with an elastic band is particularly handy day to day: the ribbon lets you find your page in an instant, while the elastic keeps the diary closed when you're on the move.

3. Overlooking pen and paper compatibility

Paper weight alone doesn't tell you everything about the writing experience, but it's still a good indicator. 100 gsm offset paper is thicker than the very lightweight paper used in some diaries. It generally works well with ballpoint pens, rollerballs and fine-tipped felt pens, while limiting ink show-through on the reverse. However, a test is still recommended if you use very liquid ink or a fountain pen.

Criteria to check before choosing

Size and portability

The A5 format measures approximately 14.8 × 21 cm. It offers a good balance between writing space and ease of transport: enough room to jot down appointments and tasks, without taking up as much space as a large notebook.

If you travel frequently, also consider the thickness and weight. An A5 planner loaded with accessories can be less pleasant to carry than a more streamlined planning notebook.

Layout organisation

A monthly and weekly organiser should let you switch quickly from an overview to detailed planning. The monthly view is for noting deadlines, exams, holidays and bills. The weekly view is better for appointments, priorities and recurring tasks.

People who track goals over several months will also appreciate:

  • a customisable start page;
  • note spaces alongside the weeks;
  • enough pages to detail the different stages of a project;
  • an undated structure, so nothing is lost if you take a break.

Materials and care

A hard cover made from laminated cardboard protects the contents effectively, but it should be kept away from moisture. Clean it with a soft, dry cloth, then store the diary in a dry place, away from a heat source or naked flame. Handle the elastic and ribbon without pulling them excessively.

Our selection by profile

The models below are compared based on their stated features: size, number of leaves, paper and accessories. The best choice depends mainly on your organisation method and how often you use it.

Recommended for: Beginners on a budget
Jubiluu undated A5 18-month planner Blush Pink

Jubiluu A5 Undated Hardcover 18-Month – Blush Pink

Why this suits this profile: Its undated design means you can start at any time, without waiting for the new term or a calendar change. The A5 format works well for study, work and personal organisation.

How this product avoids the pitfall

The 224 pages are divided between undated monthly and weekly views. So you're not paying for pages you can't use if your habits change.

Key features and highlights

100 gsm ivory offset paper, hard cover, ribbon page marker and elastic closure. Available in several colours.

Recommended for: Premium enthusiasts
MOLESKINE Casa Batlló Large Ruled Notebook

MOLESKINE Casa Batlló Large Ruled Notebook

Why this suits this profile: This notebook is for those who want a refined finish and a traditional writing experience, for keeping a personal journal, jotting down ideas or moving creative projects forward.

How this product avoids the pitfall

The listing mentions 100 gsm ivory paper, a binding that allows it to lie flat, an expandable inner pocket and an elastic closure.

Key features and highlights

Hard cover with a textile pattern inspired by Casa Batlló, acid-free paper and ribbon page marker. Please note, this is a ruled notebook, not a structured diary.

Recommended for: Specific uses and heavy users
Jubiluu undated A5 18-month planner Classic Black

Jubiluu A5 Undated Hardcover 18-Month – Classic Black

Why this suits this profile: Freelancers, employees and students who plan regularly can use the monthly views for deadlines, then the weekly views to allocate their tasks.

How this product avoids the pitfall

Its stated 18-month capacity and weekly pages with note space mean you don't need multiple notebooks for the same project.

Key features and highlights

A5 format, 112 leaves of 100 gsm offset paper, hard cover and elastic closure. The black colour fits easily into a professional environment.

Looking for other options?

We've put together a comprehensive, real-time updated list of products that meet these exacting criteria as well as European safety regulations.

Frequently asked questions about undated A5 18-month planners

How do I start an undated diary?

Start by writing the current month and week in the spaces provided. Then reserve the monthly view for appointments and fixed deadlines, and use the weekly view to detail your tasks. The note pages can be used to track a goal, a budget or a project.

How long can an undated diary last?

It all depends on how often you write and the structure of the model. A diary advertised for 18 months is designed to cover that period when used according to its layout. Thanks to the undated pages, you can take breaks without leaving printed but unused weeks behind.

What paper should I choose for a work or study diary?

A weight of 100 gsm provides a pleasant base for everyday writing and limits ink bleed-through compared to thinner paper. Also check the paper shade, the ruling, the available space and compatibility with your usual pen.