How to lay out a chalkboard poster that people actually read

Most chalkboard posters fail before a single letter is drawn, because nobody decided what the board is for. Everything below is downstream of that decision. If you do nothing else on this page, do the first section.

Decide the one message first

Stand in front of the empty board and finish this sentence out loud: "If someone glances at this for two seconds and remembers only one thing, it should be ______." That sentence is the headline. It is usually three to six words. It is almost never the full announcement, the date, the room number and the teacher's name all together.

Everything else on the board is support, and support is allowed to be small. A poster with one loud thing and four quiet things reads instantly. A poster with five medium things reads as noise, and people walk past it. Boards in corridors are read at walking pace from three or four metres away; boards in a classroom are read from the back row. Both of those distances punish a board that has no single loudest element.

Hierarchy comes from size, not from decoration

The instinct, when something feels unimportant, is to decorate it — a box, a swirl, a border of leaves, a different colour. Decoration does not create hierarchy. It creates clutter that happens to be pretty. Hierarchy comes from size, and only from size, plus a little from weight.

A workable rule for a board is three levels and no more. The headline is roughly three times the height of the body text. A second level — a subhead, a date, a section label — sits at about twice body height. Everything else is body height. If you find yourself wanting a fourth level, you probably have two posters fighting on one board, and you should split them with a horizontal division rather than with a fourth type size.

Three levels works because the jumps are big enough to read as deliberate. Levels that differ by twenty per cent look like a mistake; levels that differ by a factor of two look like a decision.

Test it by squinting

Step back, half close your eyes until the letters blur into grey shapes, and look at what survives. If the headline is not obviously the darkest, largest mass on the board, the hierarchy is not working, and no amount of flourish will fix it. This is the fastest and most honest test there is, and it takes four seconds.

Margins are structural, not leftover space

The single most common amateur mistake is running the content to the edge of the board because there is space there. Leave a genuine margin on all four sides — roughly the height of your headline letters is a good starting point, and more at the bottom than at the top, because a board with equal margins looks like it is sliding downward.

Inside the board, group things by proximity. Items that belong together sit close; items that do not sit far apart. If the gap between a heading and its own paragraph matches the gap before the next heading, the reader cannot tell which heading owns which text. Gaps organise better than boxes do.

Baseline discipline

Chalk writing droops. Everyone's does, because the natural arc of an arm is a curve and a line of text is straight. The fix is a faint guide line, drawn so lightly you can barely see it, before you write anything. Use the very tip of the stick with almost no pressure, or a ruled surface if you have one.

Draw two lines per row of text rather than one: a baseline for the letters to sit on and a second line for the height of the capitals. Two lines control both the drift and the wobble in letter height, and the second one is what makes amateur lettering suddenly look intentional. Wipe the guides afterwards, or leave them — a visible guide line on a chalkboard reads as craftsmanship rather than as an error, which is a small mercy of the medium.

If the board has a ruling already — squares, writing lines, a staff — use it rather than fighting it. Drawing on a squared board and ignoring the squares produces a subtle, permanent unease in anyone looking at it.

Draw the headline as an outline, fill it after

This is the technique that separates a board that looks made from a board that looks scrawled. Do not write a big headline in thick strokes directly. Instead, draw each letter as a thin single-line skeleton at the correct size and spacing. Look at it. Fix the spacing, because spacing is always what is wrong. Only then draw a light outline around each skeleton at the weight you want, and only then fill the outlines in.

Three reasons this works. First, you can still fix a skeleton — a thin line wipes away cleanly, a thick filled letter leaves a ghost. Second, judging spacing is far easier on skeletons than on fat shapes, because fat shapes hide the gaps. Third, the fill can be uneven, textured, or hatched rather than solid, and it will still look controlled, because the outline holds the shape.

Colour separates zones; it does not decorate

On a dark board, colour is expensive. Coloured chalk is less bright than white against a dark ground, so coloured text at body size is often genuinely harder to read from the back of a room. Use that fact: keep the loudest information in white or a warm off-white, and use colour to say "this is a different zone" — a band along the top, a section marker, an underline that separates the notices from the timetable.

Two colours plus white is usually the ceiling. A third colour has to earn its place by carrying meaning, and if you cannot say in one sentence what the third colour means, it is decoration. On a light ground the arithmetic inverts: a dark line is the strong element and pale colours vanish, so a layout you designed for a green board will need its colour roles swapped before it works on white paper.

Plan the erasure before you draw

A board is not a poster. Part of it will be wiped and rewritten weekly, and if you have not planned for that, the weekly update destroys the layout. Decide up front which regions are permanent — the title band, the frame, the standing sections — and which are volatile. Keep the volatile regions rectangular and separated by a clear gap, so you can wipe one without smearing into its neighbour.

Make the volatile regions slightly larger than this week's content needs, too. A layout sized exactly to its first week gets crammed by week three.

Sketch small before you commit

Never plan a large board at full size. Draw a rectangle the same proportion as the board, about the size of your palm, and lay the whole thing out in that rectangle in a couple of minutes with rough blocks rather than real letters. At that size you cannot fuss with letterforms, which is the point — you can look at nothing but proportion, balance and hierarchy.

Do three of them, not one. The first thumbnail is always the obvious layout; the third is usually better. Then scale the winner up by eye, marking only the headline box and the main division lines on the real board before you start writing.

A tablet is a convenient place to do this, because you can wipe and try again without stopping to find a cloth, and because you can draw the thumbnail on the same kind of surface you are about to work on. Flying Chalk is useful here for a practical reason rather than a clever one: it has ruled, squared and staff surfaces, so the thumbnail can carry the board's own ruling, and clearing it is a single gesture. Whatever you use, the thumbnail is the step people skip and regret two hours into a board.

A short order of operations

1. Write the one-sentence message down in words.
2. Three palm-sized thumbnails; pick one.
3. Margins and main division lines on the board, faintly.
4. Guide lines for every row of text.
5. Headline skeleton, fix the spacing, outline, fill.
6. Body text, quietly, at one size.
7. Colour last, and only where it separates zones.
8. Step back and squint.

Related guides

• Chalk lettering: how to hold the stick, stroke order and pressure
• Chalkboard vs whiteboard for teaching: an even-handed comparison
• Why chalk marks look the way they do