Sketchbook Size for Urban Sketching (October 2026 A5, A6 or 9×12)

Most urban sketchers should carry an A5 sketchbook, roughly 5.8 by 8.3 inches (148 by 210 mm). It is big enough for a recognisable building or street corner with a light wash, small enough to sit unnoticed in a jacket pocket or crossbody bag, and it can be drawn in and finished within a single 10 to 15 minute sitting on a street corner. This guide covers the sketchbook size for urban sketching question in full: which formats exist, which one fits the time you actually have, and what each size costs you in the bag and on the page. Updated for 2026.

I have sketched in cafés, on trains, in hotel lobbies and in the rain, and the wrong book has killed more sessions than a lack of skill ever has. A book that is too large never leaves the house. A book that is too small leaves you unable to fit the architectural detail that urban sketching is actually about.

So size selection is a three-variable decision: how long you have to draw, which medium you use, and what you can physically carry. The book that matches all three beats any book that is simply bigger.

Table of Contents

• The Short Answer: What Size to Carry
• Sketchbook Size Comparison Table
• A-Series vs B-Series: Why a Bigger Number Means a Smaller Page
• A4 or A5: Which Should You Carry?
• A6 and Smaller: True Pocket Sizes
• 9×12: Why American Urban Sketchers Default to It
• Match the Book to Your Time Budget
• Paper Weight and Paper Type for Urban Sketching
• Binding and Surviving the Journey Home
• Sketching in Public Without the Anxiety
• Wet Media Outdoors: Wind, Water and Panels
• Common Urban Sketching Mistakes to Avoid
• How to Choose: A Five-Step Method
• Frequently Asked Questions
  • What size sketchbook should I get?
  • What is the ideal size for a sketchbook?
  • Is A4 or A5 better for sketching?
  • How big is an A6 sketchbook?
  • How big is a 9×12 sketchbook?
  • What size is a pocket sketchbook?
  • What is the best sketchbook for a beginner?
  • What is the recommended paper weight for a sketchbook?
  • What type of paper is best for urban sketching?
  • What are common urban sketching mistakes?
• Conclusion

The Short Answer: What Size to Carry

• Carry an A5 (5.8 x 8.3 in) as your default urban sketching book if you want one answer to remember.
• Drop to A6 (4.1 x 5.8 in) or a 3.5 x 5.5 in pocket format if you sketch in genuinely quick bursts and travel light.
• Move up to A4 (8.3 x 11.7 in) or 9×12 if you sit down for 45 minutes or more, work in washes, or draw architecture with real detail.
• Use B5 (7×10 in) or B6 (5×7 in) if you want a size that is not on the A-series, which is common in the US.
• Stay at A3 or larger only for studio work or very deliberate seated sessions. Almost nobody draws at that size on a street corner.

Everything below unpacks those five lines, including the part most buying guides skip: what you give up at each step down in size.

Sketchbook Size Comparison Table

This is the reference table I wish I had when I started. Dimensions are page sizes, and the millimetre figures are rounded from the ISO standard.

Format	Size in inches	Size in mm	Best for
A6	4.1 x 5.8	105 x 148	Pocket notes, 5-minute sketches, travel light
B6	5 x 7	127 x 178	Pocket sketching with a little more room
A5	5.8 x 8.3	148 x 210	The default carry size for urban sketching
B5	7 x 10	176 x 254	More detail than A5, still bag-friendly
A4	8.3 x 11.7	210 x 297	Seated sketching, light watercolour washes
9×12	9 x 12	229 x 305	The American urban sketching default
A3	11.7 x 16.5	297 x 420	Studio work and large architectural studies

One caution on page counts. Because paper weight changes thickness, a book with the same page size and the same number of pages can be twice as thick in grams as in a lighter stock. Check the thickness in millimetres if bag space is tight, not just the page count.

A-Series vs B-Series: Why a Bigger Number Means a Smaller Page

This single naming convention causes more beginner confusion than anything else in the format list. The A-series and B-series both work the same way: the number counts down as the page gets smaller. A6 is smaller than A5, and A5 is smaller than A4.

There is a second difference. The B-series is built from the A-series by adding about 10 mm to the short edge and 20 mm to the long edge. That is why a B6 (127 x 178 mm) is slightly wider and shorter than an A6 (105 x 148 mm), and why a B5 (176 x 254 mm) sits neatly between A5 and A4.

Practical takeaway: the B-series gives you roughly the size of the next A-format up, but with less wasted margin. Several sketchbook brands use B5 and B6 names because the extra width suits a pen hand and a slightly wider drawing surface. Nothing is wrong with either system, you just have to check the actual millimetres rather than assume from the letter.

A4 or A5: Which Should You Carry?

Carry A5 for street sketching and A4 when you are sitting still. A5 is the size that fits a normal day on foot, and an A5 page gives you enough area to block in a facade and add a shadow wash. A4 is the better choice if you are working in watercolour, if you want a two-page spread, or if you are staying put for the better part of an hour.

The honest counter-argument is that plenty of serious sketchers carry the larger format on purpose. One contributor on the Proko community forum keeps both A3 and A4 books on the go, using A3 only for larger pieces and doing all of their gesture study on A4. Another carries a B6 for on-the-go work and a B5 for the studio.

That is a legitimate workflow, but notice the pattern: the people working at A3 and A4 are pairing it with a smaller book. That is the two-book system, and it solves the problem that a single format always creates.

A6 and Smaller: True Pocket Sizes

A pocket sketchbook is A6, or anything smaller down to about 3 x 3.5 in. A6 pages are 105 by 148 mm, which is roughly the size of a large passport. A 3.5 x 5.5 in book is a touch narrower and shorter and is a very common American pocket format.

Small books are not a compromise, they are a style. An Instagram sketcher in Atlanta uses a 3.5 x 5.5 in book and calls that pocket size her choice for when she wants to travel light and still keep her urban sketching practice going. A sketcher in the Cotswolds works in an A6 (about 14 by 10 cm) for quick, rough ink and watercolour wash sketches. Neither of them describes the format as restricted.

What you give up is real, though. At A6 you lose room for a three-storey elevation with windows, and you lose wash room, because a puddle that would sit comfortably on A5 buckles an A6 page on 120 gsm paper. If your urban sketching is architectural, the smaller end of the scale costs you the thing you most wanted to draw.

9×12: Why American Urban Sketchers Default to It

A 9×12 sketchbook is 9 by 12 inches, or 229 by 305 mm, which is slightly larger than A4. It has no ISO letter, which is exactly why it confuses people who shop by A-series number. 11×14, at 279 by 356 mm, is the next step up in the same non-standard series, and both sizes are far more common in US stationery than in Europe.

9×12 is the format most referenced by active urban sketchers in the United States, and the reasons are practical. It gives a full building plus its pavement, it takes a decent wash, and it scans well because it fits most flatbed scanners at full width.

The cost is bag space, and the people who use this format are the ones who complain about it most. One urban sketcher writing on a hobby blog noted the honest downside plainly: the spiral binding also takes up extra room in the sketch bag. A wire-bound 9×12 with a soft cover is the version that actually survives a commute.

Match the Book to Your Time Budget

This is the connection most guides miss. Page size determines how long a sketch takes, and the sketch duration is the real constraint in urban sketching, not the page.

• An A6 or B6 page is a 5 to 10 minute sketch: a figure, a doorway, a café chair, a quick value study.
• An A5 page is a 10 to 15 minute sketch: a single shopfront, a bridge span, a corner of a market with figures.
• An A4 or 9×12 page is a 45 to 60 minute seated sketch: a full street elevation, a garden, a group of people in a plaza.
• An A3 page is a multi-session piece. It does not belong in a day bag.

Time your own typical sitting before you buy. Sit on a bench for ten minutes and try to finish something. If you can complete a drawing in that window, an A5 is generous. If you get absorbed and lose twenty minutes without noticing, you need the page area of a 9×12 and the discipline of a fixed spot.

Step 1: time a session on paper. Step 2: note how long you actually drew, not how long you sat. Step 3: pick the page that matches that number.

Paper Weight and Paper Type for Urban Sketching

Weight is measured in gsm, which is grams per square metre, and it is really a measure of how much liquid the sheet can take before it buckles and bleeds through. For a carry-size book, the sweet spot depends entirely on your medium.

Medium	Minimum weight	Notes
Pencil, ballpoint, fineliner, dry pastel	90 to 120 gsm	Thin is fine and gives you more pages per gram
Fountain pen, gel pen, markers	120 to 200 gsm	Watch for feathering and bleed on very smooth stock
Ink and light watercolour wash	200 gsm	The practical floor for any wash on location
Watercolour and gouache	250 to 300 gsm	Handles a wet brush and pooling without buckling
Mixed media, collage elements	250 gsm and up	Also needs to take tape, scraping and erasure

Tooth matters as much as weight. A cold-pressed or textured sheet grips dry media and toothpaste-ish gouache but makes fountain pen ink drag. A hot-pressed sheet is smooth, which suits ink, fine detail and ballpoint, and it will not hold a heavy wash without careful technique.

Colour is a practical daylight decision, not an aesthetic one. Under direct sun, bright white paper bounces light straight into your eyes and flattens your values, so mid-tone and ivory sheets are easier to read. Ivory is gentler on the eyes for long sessions; toned paper suits pen work, where the tone does the shading for you and you can add highlights in white.

Check that the paper is acid-free if you plan to keep finished pages. It costs nothing to check and it protects work you care about.

Binding and Surviving the Journey Home

Choose a binding that lies flat, because a book that will not open to 180 degrees is unusable for one-handed sketching on a street corner. That single requirement eliminates most of the field.

• Spiral or wire-bound lies flat perfectly, but adds a stiff strip of bulk along one edge and can stop a full page from being visible. Best for dry media, worst for bag space.
• Case-bound or thread-sewn is compact and lies reasonably flat with a little practice, and it protects pages far better in transit. Slower to flip.
• Concertina or accordion folds into a small package and opens wide, which suits panoramic street scenes. Harder to keep clean.
• Stapled is compact but pages tear out at the staple line as soon as you open it repeatedly.

Left-handed sketchers should check this before anything else. A binding that sits on your drawing hand side forces you to grip the page awkwardly and causes hand fatigue within an hour. Spiral on the right, or a case-bound book that opens flat, solves it.

Transit damage is the complaint that comes up most often in community threads. Sketchbooks do not survive being carried: corners crease, covers bow, and pages tear at the fold. Three cheap habits fix most of it. Keep the book in a rigid sleeve or a plastic document pouch when it is not in use. Put an elastic band or a belt loop around the closed book so the cover cannot snap shut. And carry it spine-in against your body rather than loose at the top of a bag.

For archiving, wire-bound books can be opened and the binding rings removed, after which the pages lie flat on a flatbed scanner. That workflow is worth knowing if you want digital copies of finished work without destroying the book.

Sketching in Public Without the Anxiety

The single biggest reason people do not urban sketch is that drawing in public feels conspicuous. Nobody in this conversation has ever addressed that, and it is a size question more than a confidence question.

A 9×12 book held open on a train platform announces itself. A B6 book in a crossbody bag, opened briefly at waist height while someone else waits for their coffee, does not. Sketcher after sketcher has reported that moving to a smaller format is what finally made them draw outdoors regularly, because the book is less intimidating to start in, easier to fill, and easier to put away again if the light is bad.

There is a practical side too. Small books generate more finished pages, and a stack of finished pages does more for your confidence than a single ambitious attempt that you abandoned. If you have been meaning to start sketching in public, shrink the book rather than resolve harder.

Wet Media Outdoors: Wind, Water and Panels

Working wet on location has logistics that no indoor guide covers. Wind blows the page, the lid comes off your water container, and any spill becomes a buckle. The size of the book changes all three problems, because a larger book is heavier and harder to shield.

On a windy day, a smaller bound block beats a larger one. You can angle your whole body over it, and a 5.8 by 8.3 inch page is coverable with one hand and a jacket. On a still day, a loose panel in a portfolio is better still, because you can lay it flat on a wall or a bench and work with your body out of the way.

One urban sketcher in Buenos Aires carries a handmade accordion book plus an A4 watercolour book, which covers both needs: a wide panoramic format for street facades and a wash-capable book for anything with colour. Bringing your own water in a small lidded container and a cloth for your hand is the rest of the setup. Wet media outdoors is a solved logistics problem, not a risk.

Common Urban Sketching Mistakes to Avoid

These six mistakes come straight from what sketcher communities complain about most often, and every one of them is a size or specification error.

1. Buying a book that never leaves the house. Size it to the bag you actually carry, then buy the next size up if the bag is a tote.
2. Ignoring the time budget. A 9×12 page cannot be finished in a ten-minute stop, so you end up with half-finished pages instead of work.
3. Choosing a binding that does not lie flat. You cannot sketch a window accurately with your hand resting on a raised page.
4. Going too thin for your medium. Under 120 gsm is fine for pen; any wash at all needs 200 gsm or more.
5. Choosing a right-handed layout as a left-handed sketcher. Binding interference causes hand fatigue that looks like a technique problem.
6. Carrying the book unprotected. A sleeve, a pouch and an elastic band cost almost nothing compared with a book of cornered and torn pages.

None of these are about talent or commitment. They are all decisions you can make once, in a shop, before you are standing on a pavement in the rain.

How to Choose: A Five-Step Method

Work through these in order and the size decides itself. Most people start at step two and get it wrong.

1. Measure your bag. Take out a phone and check the width of the smallest pocket you would actually use. A6 fits a front jeans pocket. A5 fits a crossbody or a coat pocket. 9×12 needs a tote or a backpack.
2. Time a sitting. Draw for ten minutes and see whether you finish or get absorbed. This sets your page size.
3. Choose the medium. Dry media lets you go lighter and smaller in page count. Any wash pushes you to 200 gsm and up, which means a thicker book for the same size.
4. Pick the binding. Lay-flat first, then bulk, then left-handed fit.
5. Then pick the size. With the first four answered, the format is usually obvious. If it is A5, buy two.

As a beginner, an A5 with 120 to 200 gsm paper and a lay-flat binding is the safest starting point. It is portable, forgiving, and easy to fill, which is what keeps practice going past the first month.

One habit worth building early: the two-book system. Carry a small A6 or B6 for quick notes and gesture work during a walk, then a larger A5 or 9×12 for the piece you actually want to finish. Nine-year r/urbansketchers regular mrandre described exactly this logic when they settled on a notebook with a drawing-paper refill that clips into a small hip bag, calling it a game changer for being ready at a moment’s notice.

Frequently Asked Questions

Conclusion

For urban sketching, carry an A5 (5.8 x 8.3 in). It is the balance point between page area and bag reality, it matches the ten to fifteen minute sittings that street work actually produces, and it stays discreet in public. Go smaller to A6 or a 3.5 x 5.5 in format when you want travel-light gesture work, and go larger to A4 or 9×12 when you are sitting still or working in washes.

Measure your bag, time one sitting, and match the paper weight to your medium. That is the whole decision. Then take the book outside, because the size question stops mattering the moment the first page is finished.