Wallpaper vs Paint + How Much Wallpaper to Buy

Whether to wallpaper or paint is one of the first decisions you make when decorating a room. Paint is faster, easier to change, and cheaper to apply, but wallpaper offers texture, pattern depth, and an impactful quality that flat paint cannot replicate. Many rooms benefit from a combination: painted walls with a single wallpapered feature wall, or painted woodwork against a fully papered room.

Once you have decided on wallpaper, calculating the right number of rolls is critical. Too few means running out mid-room; too many is wasted money, especially with mid-range to premium papers. This guide walks through both the decision and the calculation.

Wallpaper vs Paint: A Practical Comparison

Choose paint when: you want flexibility to change colour easily, the room is small, you want to minimise disruption, or the walls are in excellent condition.

Choose wallpaper when: you want pattern, texture, or a statement finish; the walls have minor imperfections a lining paper can bridge; or you want a premium finish that lasts longer between decorations.

UK Wallpaper Roll Sizes

Standard UK wallpaper rolls measure 10 m long × 520–530 mm wide (many are 10.05 m), approximately 5.2–5.3 m² per roll. A typical budget roll, such as Anaglypta’s Royal Oak blown vinyl, is 10 m × 52 cm and covers 5.2 m².¹ Some premium and designer papers are 10 m × 700 mm (7 m²/roll) or shorter (e.g., 9 m, 8 m). Always check the dimensions on the roll’s specification label before calculating.

Understanding Pattern Repeat

Straight match (also called a drop of 0): the pattern matches horizontally across joins. Each strip lines up without offset. Waste is minimal, usually only the short piece trimmed from the top and bottom of each drop.

Half-drop match: the pattern on every other strip is offset by half the repeat length.² This is a common format for decorative papers. You cut alternating strips from two rolls simultaneously to minimise waste.

Free match / random: no repeat alignment needed. Textures, grasscloths, and some abstract designs fall here. Waste is lowest with these papers.

The pattern repeat length determines how much is wasted per drop.² With a 64 cm repeat and 2.5 m drops, each drop has to use a whole number of repeats: 4 × 0.64 m = 2.56 m of paper per drop, as in the worked example below. Where the drop length falls just above a multiple of the repeat, the waste per drop approaches a full repeat. On papers with large repeats (50 cm+), waste can be 20–30% of total paper used.

How to Calculate Wallpaper Rolls: Step by Step

Step 1, Measure wall height
Measure floor to ceiling. Add 100 mm for trimming top and bottom (50 mm each end). This is your drop length.

Example: 2.4 m ceiling height → drop length = 2.5 m

Step 2, Calculate drops per roll
Divide roll length by drop length (ignoring repeat for now):

10 m ÷ 2.5 m = 4 drops per roll (straight match)

Step 3, Adjust for pattern repeat
For a half-drop with a 53 cm repeat:
Round your drop length up to the next multiple of the repeat:
2.5 m ÷ 0.53 m = 4.7 → round up to 5 repeats × 0.53 m = 2.65 m effective drop length

10 m ÷ 2.65 m = 3.77 → 3 drops per roll (round down)

Step 4, Count the drops needed around the room
Measure the total perimeter of the room in millimetres. Divide by roll width (e.g., 520 mm):

For a room with 15 m perimeter: 15,000 ÷ 520 = 28.8 → 29 drops

Step 5, Calculate rolls needed

29 drops ÷ 3 drops per roll = 9.7 → 10 rolls

Always add one extra roll as contingency, for cutting errors, future repairs, and to cover the possibility of a slight dye lot difference if you need to reorder. For rooms over 12 rolls, add two spare rolls.

Worked Example: A Standard Bedroom

Room perimeter: 14.5 m
Ceiling height: 2.4 m → drop length with trim: 2.5 m
Wallpaper: 10 m × 520 mm roll, 64 cm half-drop repeat

• Effective drop length: next multiple of 0.64 m above 2.5 m → 3 × 0.64 m = 1.92 m (not enough); 4 × 0.64 m = 2.56 m ✓
• Drops per roll: 10 ÷ 2.56 = 3.9 → 3 drops per roll
• Total drops needed: 14,500 ÷ 520 = 27.9 → 28 drops
• Rolls needed: 28 ÷ 3 = 9.3 → 10 rolls + 1 spare = 11 rolls

Feature Walls: One Wall Only

A single feature wall is a cost-effective way to introduce wallpaper without committing to a full room. Measure only that wall’s width and height, follow the same calculation, and you will typically need 2–4 rolls, plus the spare, for a bedroom or living room wall 3–5 m wide with a 2.4 m ceiling.

When mixing wallpaper with paint on other walls, paint the remaining three walls first, cut into the wallpaper edge precisely to give a clean finish.

Wallpaper Cost Summary

Add professional hanging at £20–£35 per roll (labour only) for a fully papered room, or typically £300–£700 for a professional decorator to paper a typical room including preparation and lining paper if needed, in line with the labour figure in the comparison table.

Order all rolls from the same production batch (the batch number is on each roll’s label), because rolls from different batches can differ slightly in colour and pattern.³