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How to choose an undated 18-month A5 planner

An undated 18-month A5 planner can see you through a university term, a career change, a work project or a new personal routine that starts part-way through the year. Its main advantage? No pages are left blank if your plans change. But between claims of ‘premium’ covers, heavily decorated layouts and products described simply as A5, a few details can turn a practical purchase into a notebook that doesn’t work for you.

Here are the points to check before choosing an A5 diary, daily organiser or planner that suits your habits.

Common pitfalls to avoid before buying

1. Confusing A5 size with the writing space available

A format close to 14.8 × 21 cm usually corresponds to A5 dimensions. However, the cover, binding and margins can reduce the amount of usable writing space. If you make a lot of notes about appointments, tasks or classes, check the internal layout first rather than relying on the external dimensions alone.

A weekly diary gives you an overview, while a daily diary leaves more room for detail. For both study and work, a weekly double-page spread with a notes section is often a good compromise.

2. Trusting a hard-wearing cover without checking the binding

A hard cover protects the pages better in a bag, but it also makes the planner heavier. A soft or semi-rigid cover, on the other hand, is easier to carry, but offers less protection for the corners and pages.

The binding is also worth a closer look. A spiral binding lets the notebook open flat, while a stitched or glued binding generally makes for a more compact finish. Either way, check that it opens wide enough for you to write comfortably near the spine.

3. Underestimating paper weight

Paper weight alone can’t guarantee a perfect writing experience, but it’s a useful guide. 100 g/m² paper is generally more substantial than very thin paper and better suited to everyday writing. If you use felt-tip pens or liquid ink pens, though, check whether ink might show through on the reverse.

Accessories such as an elastic closure and a ribbon page marker are handy, but they’ll never make up for an easy-to-read layout or a cover that suits how you use your planner.

Technical features to compare

An organisation system that suits your routine

Before choosing, consider whether you’re more likely to plan:

  • your appointments hour by hour;
  • your tasks week by week;
  • your monthly goals and projects over several months;
  • your classes, exams and work deadlines.

A goal planner should include space to set priorities and track your progress. If you need to plan in great detail, a daily organiser with a page for each day will be more suitable. A weekly layout is a better fit for changing schedules and anyone who wants to see the week at a glance.

A size that’s easy to carry without compromising on functionality

A5 is a versatile format that works just as well in a rucksack or briefcase as it does on a home-working desk. Compare the stated dimensions, page count and overall thickness. A 224-page planner can include monthly and weekly sections as well as notes pages, without being as heavy as a ring binder.

For a work diary, also check how much space is set aside for meetings, to-do lists and quick notes. For a study planner, monthly pages can make it easier to spread out homework and deadlines.

Verifiable product information

Before placing your order, check:

  • the exact format and stated dimensions;
  • the number of sheets or pages;
  • the type of cover;
  • whether a page marker and elastic closure are included;
  • whether it’s dated or undated;
  • care instructions and safety warnings.

An undated product shouldn’t be described as a dated academic diary. It lets you start whenever you like, but you’ll need to fill in the dates yourself.

Our picks for different needs

Recommended for : Beginners on a budget
Jubiluu A5 Undated Hardcover 18-Month Scarlet Red

Jubiluu A5 Undated Hardcover 18-Month - Scarlet Red

Why it’s a good fit for this reader : Its undated A5 format means you can start at any time, without paying for weeks you won’t use. It’s ideal if you’re new to personal planning, and works well for both study and work.

How this product helps you avoid the pitfall

The undated format avoids waste if your routine changes. You only fill in the monthly and weekly pages when you need them.

Key benefits and features

Hard cover, 100 g/m² ivory offset paper, 224 pages stated, elastic closure and page marker.

Recommended for : Fans of premium stationery
MOLESKINE 12-Month Weekly Planner XL Soft Blue

MOLESKINE 12-Month Weekly Planner XL Soft Blue

Why it’s a good fit for this reader : This planner is for people who appreciate a structured layout, built-in accessories and a high-quality tool for professional or creative use.

How this product helps you avoid the pitfall

The product details describe a weekly layout complemented by dedicated pages for notes, projects and goals: it’s much more than a simple calendar.

Key benefits and features

Elastic closure, page marker, expandable inner pocket, opens flat to 180° and 70 g/m² ivory paper.

Recommended for : Specialist needs and frequent users
L'Etudiant Original Black Academic Planner 2026–2027

L'Etudiant Original Black Academic Planner 2026–2027

Why it’s a good fit for this reader : With a page for each day, this model is aimed at secondary school pupils, university students and anyone who records lots of tasks or information each day.

How this product helps you avoid the pitfall

The dated format and daily pages mean you don’t have to fill in the calendar yourself. However, this model may be less suitable if you’re starting to get organised part-way through the year.

Key benefits and features

352 pages, stated size of 15 × 21 cm, spiral binding and semi-rigid cover.

Looking for more options ?

We’ve put together a comprehensive, real-time list of products that meet these demanding selection criteria and European safety regulations.

FAQs about undated 18-month A5 planners

Is an undated planner suitable if I’m starting part-way through the year ?

Yes. You can add your own dates and start whenever it suits you. This flexibility is particularly useful if you’re returning to study, starting a new job or working on a project whose start date hasn’t yet been set.

What’s the difference between a weekly diary and a daily diary ?

A weekly diary gives you a snapshot of your appointments and priorities. A daily diary gives you more room to write in detail about tasks, meetings and notes. The right choice mainly depends on how much information you record each day.

How long will a planner stay in good condition ?

It depends on how often you carry and handle it. A hard cover, an elastic closure and storing it somewhere dry can all help reduce wear and tear. Avoid overfilling the pocket or leaving the notebook near a source of heat.