Pattern Repeat Explained: Straight, Drop and Free Match

Two figures on a wallpaper label decide how much paper you buy. The repeat is the vertical distance before the design starts over. The match tells you how the design on one strip lines up with the strip beside it. Together they decide how much of each strip you throw away — and that, not the size of the room, is usually what pushes a job from five rolls to seven.

The useful thing is that the relationship is not linear. A bigger repeat is not automatically more expensive, and a drop match is not automatically more wasteful than a straight one. Both of those are widely repeated and both are wrong. Here is what actually governs it.

Reading the label

Most rolls print the repeat in inches or centimetres, and most print a second figure or pictogram for the match. When the second figure equals the repeat, the paper is a straight match. When it is half the repeat, it is a drop match. When it is zero, or the label simply says random, there is no alignment to worry about.

The pictograms are worth learning because they survive translation. Two arrows sitting level with each other means straight match. Two arrows offset, one lower than the other, means drop. A single arrow, or an arrow pointing both ways, means free match and often also means the paper can be hung reversed.

If the label is missing, unroll about six feet and find the same point in the design twice. The distance between them is the repeat. Then hold two lengths side by side: if the design aligns at the same height, straight match; if you have to slide one down to make it work, drop.

Free match

Nothing has to line up. Grasscloth, most textures, plain colours, vertical stripes and many small-scale random prints are free match. You cut every strip at wall height plus your trim allowance and nothing is discarded to alignment.

Free match is also the forgiving one for a first-time hanger. There is no penalty for hanging a strip an inch high, and on many free-match papers you can reverse alternate strips — flipping every other length end for end — which evens out any shading difference between one edge of the roll and the other. Grasscloth in particular is normally hung this way.

Straight match

The same point in the design sits at the same height on every strip. All strips are cut identically, which makes the cutting simple: measure once, cut the whole room.

The cost is that each strip has to be cut to a whole number of repeats. If your wall needs 112 in of paper and the repeat is 25 in, you cut at 125 in, because four repeats reach only 100. Thirteen inches leaves the roll on every strip.

Drop match

Also called half-drop or offset match. The design shifts sideways by half a repeat between adjacent strips, so strips alternate: A, B, A, B. Strip three matches strip one; strip four matches strip two.

This sounds harder to hang and mostly is not. What it changes is bookkeeping: cut in pairs, and label the back of every strip with its number and an arrow pointing up before you take it off the table. Hanging a B where an A belongs is the one mistake that costs a full strip, and it is easy to make three walls in.

What drop match does not do is waste more paper. Because the useful step is half the repeat rather than the whole one, the cut length can land much closer to your actual strip length. On the same wall, a drop match will frequently use less paper than a straight match of the same repeat — sometimes a great deal less.

What a repeat actually costs

Take one room and change nothing but the paper. A 16 × 13 ft living room, 9 ft ceilings, one doorway, papered in standard US double rolls of 27 in × 54 ft. The room needs 25 strips whatever you hang on it.

Two things fall out of that table, and neither is intuitive.

First, the roll count does not creep upward with the repeat. It sits flat at five rolls from a plain paper all the way through a 32 in repeat, then jumps to seven at 36 in, then drops back to five at 40 in. Nothing gradual happens. You are either on the right side of a threshold or the wrong side of it.

Second, the 40 in paper is cheaper than the 36 in paper. That looks like an error and is not. At 36 in you need four repeats to clear a 112 in strip, which means cutting at 144 in, and a 648 in roll yields only four of those. At 40 in you need only three repeats, cutting at 120 in, and the roll yields five. The larger repeat happens to divide the strip length more efficiently.

The same effect explains the last row. That 36 in paper as a drop match steps in 18 in increments instead of 36, lands at a 126 in cut, and drops straight back to five rolls — two rolls cheaper than the identical design as a straight match. If you are choosing between papers, this is the calculation worth running before you commit: put each candidate into the wallpaper calculator with your real ceiling height and compare the roll counts rather than the repeat figures.

Which threshold you land on

Ceiling height moves the thresholds as much as the paper does. The same 36 in paper in an 8 ft room needs a 108 in cut instead of 144, because three repeats now clear the strip — and the expensive case disappears entirely. This is why a rule like "allow 20% for a large repeat" is close to useless. The waste depends on how your specific strip length divides into your specific repeat, and there is no shortcut that survives contact with a real room.

It is also why the number to compare between two papers is rolls, not repeat. A designer paper with a 45 in repeat can genuinely work out cheaper than a mid-range one with a 30 in repeat in your room, and more expensive in the room next door.

Practical notes for hanging

• Check the batch or dye lot number on every roll before you start. Mixing lots shows as a shading change down a seam and cannot be fixed afterwards.
• On a drop match, number every strip on the back and mark which way is up. Do this at the table, not at the wall.
• Start at the most visible corner and work away from it in both directions, so the inevitable mismatch lands where nobody looks.
• Cut two or three strips ahead, not the whole room. If the ceiling turns out to run downhill, you want the option to adjust.

The short version

Repeat is how far the design travels before it starts over; match is how neighbouring strips align. Free match cuts at wall height. Straight match rounds up to a whole repeat. Drop match rounds up to a half repeat, which is why it often costs less than its reputation suggests. Because all of it turns on rounding, roll counts move in steps rather than smoothly, and the only reliable way to compare two papers is to run both. If you have your measurements to hand, the step-by-step method walks through the measuring order first.