How many rolls of wallpaper do I need? Drops, rolls and the spare

Type your room, or the walls you want to paper, the wall height and the pattern repeat from the label. The calculator counts the drops, the drops in each roll and the rolls to buy, and draws every drop on your walls.

The formula, written out

Wallpaper goes up in drops: strips cut from the roll, as long as the wall is high. So count drops, not square metres:

The 10 cm is for trimming at the ceiling and the skirting; Which? gives the same figure. Working from square metres instead undercounts, because it assumes the offcut at the end of each roll is used. It rarely is: in the room above, each roll has only 5 cm left after four drops, and with a pattern the waste is much larger.

Rolls for common UK rooms

Each row is a room with one door, papered all round with standard 10.05 m × 53 cm rolls. Add one spare roll to each figure.

Look at the jump from 2.4 m to 2.6 m. At 2.4 m, four plain drops of 250 cm fit in a 10.05 m roll; at 2.6 m only three of 270 cm do. Twenty centimetres of wall costs two more rolls. Always measure your own height.

The offset figures assume you cut every drop from one roll in turn, the safe way to count. If you cut odd drops from one roll and even drops from another, each roll matches straight, and the 4 × 3 m room at 2.6 m needs 9 rolls, not 13. That is our arithmetic: try it only if you are confident matching a half-drop.

Pattern repeat and match

The label gives two things: the repeat, the height of the pattern before it starts again, and the match. Graham & Brown names three matches:

• Free match: plain, textured or random papers. Hang the drops anywhere; nothing is wasted.
• Straight match: the pattern lines up level across every drop. Each drop must start at the same point of the pattern, so each drop uses whole repeats. With a 53 cm repeat, a 250 cm drop uses 5 repeats: 265 cm.
• Offset match (or half-drop): every other drop starts half a repeat lower. Graham & Brown's example: a 64/32 cm offset repeats every 64 cm and matches every 32 cm. It uses about half a repeat more per drop.

The lines show where the pattern starts on each drop. In the roll below each wall, light amber is paper the match uses up, and grey is the offcut left at the end of the roll.

A feature wall

One wall needs few rolls, but the spare matters more: if one drop tears, there is no slack. Choose "Feature wall" in the calculator and type the wall's width. For a 2.4 m high wall with no door:

Each figure is before the spare. A feature wall behind a bed or sofa often has a radiator or sockets too: they do not change the count, because every drop still runs floor to ceiling.

Roll sizes in the UK

A wider roll means fewer drops and fewer seams, but each drop is heavier to hang. Peel-and-stick papers come in their own sizes: choose "Other" and type the length and width from the label.

Batch numbers and the spare roll

Wallpaper is printed in batches, and the colour can change slightly from one batch to the next. On the roll it looks the same; on the wall, two batches side by side can show a line. So:

• Check the batch number on every roll's label before you start (Which?). PracticalDIY says to buy only rolls with the same batch, or lot, number.
• Buy the spare at the same time. A roll ordered later, to fix a tear or finish a wall, may come from a new batch.
• Buy more for a big pattern. PracticalDIY suggests a couple of extra rolls for a large repeat; Graham & Brown allows 10% for waste. Ask whether the shop takes back unopened rolls.

How to measure for wallpaper

1. Measure the width of each wall you will paper, corner to corner, and add them up. For a whole box room, the length and width are enough.
2. Measure the height from the top of the skirting to the ceiling, at the highest point. Old walls and floors are rarely level.
3. Count the doors. A standard UK internal door is 762 × 1981 mm (Howarth Timber), so one 53 cm drop fits across it.
4. Read the label: the roll size, the pattern repeat in cm, and the match symbol.

Mistakes that leave you a roll short

• Counting square metres. 33.6 m² of wall ÷ 5.3 m² a roll says 6.3 rolls. The real answer for that 4 × 3 m room is 7 plain, 9 patterned.
• Forgetting the trim. A 2.5 m wall with no trim seems to give 4 drops a roll; with 10 cm trim it gives 3.
• Ignoring the repeat. A 53 cm repeat costs a drop in every roll at 2.4 m.
• Mixing batches. A spare roll bought weeks later may not match.
• Taking off windows. The short pieces above and below a window still need paper.

Renting? Painting and papering usually need your landlord's agreement in writing: how to decorate a rented flat without painting covers what you can change without asking. Painting instead of papering? The paint calculator works out the litres and tins.

See the colour in your own room

Snuug, the iPhone room app, rebuilds your room in 3D from one slow walk round it. Paint your walls in Snuug and see the colour in your own room, by your own windows, before you buy a tin or a single roll. Your room comes to within about 3% of its real size in our tests of ten homes, so you can try a feature wall against the whole room and choose the one you like before you start.

Questions

How many rolls of wallpaper do I need for a 4 × 3 m room?

With 2.4 m walls and one door, the walls are 14 m round, which is 26 drops of a 53 cm roll. A plain paper gives 4 drops a roll, so you need 7 rolls. A 53 cm straight-match pattern gives 3 drops a roll, so 9 rolls. Add one spare with the same batch number.

How many drops do you get from a roll of wallpaper?

Divide the roll's length by the wall height plus 10 cm, and round down. From a 10.05 m roll, a 2.4 m wall gives 4 drops of a plain paper and 3 of most patterned papers. A 2.6 m wall gives 3 drops, and only 2 with a large offset pattern.

How many rolls of wallpaper for a feature wall?

A wall 3.5 m wide and 2.4 m high takes 7 drops. That is 2 rolls of a plain paper (4 drops a roll), or 3 rolls of a 53 cm straight-match pattern (3 drops a roll). Buy a spare from the same batch in case a drop tears.

What does pattern repeat mean on wallpaper?

It is the height of the pattern before it starts again, printed on the label in cm. With a straight match, the pattern lines up level across every drop, so each drop starts at the same point and uses whole repeats. With an offset or half-drop match, every other drop starts half a repeat lower, which uses more paper. A free match, such as a plain or textured paper, wastes nothing.

Should I take doors and windows off when measuring for wallpaper?

Take off a door, because a full drop fits across it: the piece above the door comes from offcuts. The calculator takes off one drop for each standard door. Do not take off windows: the pieces above and below a window use most of a drop, so the saving is small and the extra paper keeps you safe.

Why does the wallpaper batch number matter?

Wallpaper is printed in batches, and each batch can differ slightly in colour. Rolls from two batches can show a line where they meet on the wall. Which? says to check every roll is from the same batch before you start. Buy the spare at the same time, because a later order may come from a new batch.

Editorial notes

Written by the Snuug team and checked on 1 November 2026. A number with no source beside it is a designers' rule of thumb, not a study.

1. Which?, How to wallpaper (rolls typically 10 m × 0.53 m; add 10 cm for trimming; check batch numbers), read 31 Oct 2026
2. B&Q, GoodHome Kerria wallpaper (10,050 × 530 mm, 64 cm straight match), read 31 Oct 2026
3. B&Q, Galerie Italian Textures 3 double-width roll (10.05 × 1.06 m, 10.65 m²), read 31 Oct 2026
4. Morris & Co, Simply Severn wallpaper (wide width, 68.6 cm × 10.05 m), search summary 31 Oct 2026
5. Graham & Brown, How to measure for wallpaper (free, straight and offset match; allow 10% for waste), read 31 Oct 2026
6. PracticalDIY, Estimating the number of rolls of wallpaper (0.52 × 10.05 m; same batch number), read 31 Oct 2026
7. Howarth Timber (Green, 14 Sep 2026), UK door sizes (762 × 1981 mm), checked 31 Oct 2026

Use this from an AI assistant

This answer as JSON, or as one paragraph with format=text: https://snuug.app/api/v1/tools/wallpaper

MCP server: https://snuug.app/mcp · OpenAPI · llms.txt. Every rule cites its source.