Wallpaper Calculator UK
Working out how many rolls of wallpaper you need is where most people either overspend or — worse — run short and can't match the batch. This UK wallpaper calculator uses the drop-counting method professional decorators use, not the rough wall-area sum you'll find on most sites. It accounts for your pattern repeat and whether the paper is a straight or offset match, because a large repeat can add a whole extra roll or two to the same wall. Enter your room in metres, pick your paper's match type, and get the roll count plus the number of drops per roll.
Measurement mode
Floor to ceiling. 1.5–6 m.
0 for plain/free-match paper. Otherwise enter the repeat printed on the roll label (e.g. 52).
Match type
Straight: pattern lines up level across drops. Offset/drop: pattern steps down between drops — more waste.
Roll size
UK standard roll is 10.05m × 0.53m. Change these if your roll label differs.
Only for openings wider than one full drop, like patio doors. Do NOT subtract standard windows or doors.
10% standard; 15% for busy patterns or first-time hangers.
Enter your room dimensions to calculate the rolls you need
| Roll type | Length | Width | Approx. coverage* |
|---|---|---|---|
| UK / standard | 10.05 m | 0.53 m | ~5 m² |
| Wide-width | 10.05 m | 0.68–0.70 m | ~6.8 m² |
| Euro roll | 10.05 m | 0.53 m | ~5 m² |
| Extra-long / feature | 15 m | 0.53 m | ~7.5 m² |
*Gross coverage before pattern-repeat and trim waste. Usable coverage is always lower on patterned paper — which is why this tool counts drops, not area.
Always check the length and width printed on your actual roll label — "standard" varies by brand.
How to measure your walls for wallpaper
- Measure the full width of each wall you're papering and add them together for the perimeter — or use whole-room mode and enter length and width.
Measure the walls you're actually papering, not the whole room, if you're doing a single feature wall.
- Measure floor to ceiling for the height. Take the tallest point if the floor or ceiling isn't level.
Round the height up, never down.
- Read the pattern repeat and match type off the roll label or product page before you calculate.
The repeat is the single most important number for patterned paper.
- Order in one go from one batch.
A spare roll from the same batch is cheap insurance; a mismatched batch means re-papering a wall.
Worked example — a 4m × 3m bedroom
Take a bedroom 4m long, 3m wide, with a 2.4m ceiling, papered in a mid-range paper with a 52cm offset (drop) match, using standard 10.05m × 0.53m rolls.
- Perimeter = 2 × (4 + 3) = 14 m
- Drops needed = 14 ÷ 0.53 = 26.4 → 27 drops
- Cut length per drop (offset) = 2.4 + 0.10 + (1.5 × 0.52) = 3.28 m
- Drops per roll = 10.05 ÷ 3.28 = 3.06 → 3 drops per roll
- Rolls before wastage = 27 ÷ 3 = 9 rolls
- With 10% wastage → 9 rolls (rounds to the same here)
Now compare the same room in a plain, free-match paper: cut length drops to 2.4 + 0.10 = 2.50m, giving 4 drops per roll, so 27 ÷ 4 = 7 rolls. Same walls, same paper width — but the 52cm repeat costs you two extra rolls. That gap is exactly what the crude "wall area ÷ roll coverage" method misses.
Pattern repeat, not wall area, is what decides your roll count on patterned paper — always calculate by drops.
Frequently asked questions
How many rolls of wallpaper do I need for an average UK room?
For a typical 4m x 3m bedroom with a 2.4m ceiling, expect around 7 rolls for plain paper and 9 for a patterned paper with a large repeat, using standard 10.05m x 0.53m rolls. The exact number depends on your pattern repeat and match type, which is what this calculator works out for you.
What size is a standard UK wallpaper roll?
The UK standard roll is 10.05 metres long and 0.53 metres (53cm) wide, giving roughly 5 square metres of gross coverage. Wide-width and European rolls vary, so always check the length and width printed on your roll label.
Why does pattern repeat affect how many rolls I need?
On patterned paper, every drop has to line up with the one next to it, so you trim off up to a full pattern repeat from each length to get the match. The bigger the repeat, the more you waste per drop — which can add a whole roll or two compared with plain paper on the same wall.
What's the difference between a straight match and an offset match?
A straight match lines the pattern up level across neighbouring drops. An offset or drop match steps the pattern down between drops, so it only lines up every other drop — that offset increases waste, which is why this calculator adds more allowance for it.
Should I subtract windows and doors from my wallpaper estimate?
Usually not. You still paper above and below a standard window or door, and you need those drops to keep the pattern matching, so subtracting them risks running short. Only subtract a drop for openings wider than a full drop, such as patio doors.
Why does buying the same batch number matter?
Wallpaper is printed in batches, and colour can vary slightly between batches. If you run short and buy more later from a different batch, the mismatch can be visible on the wall and can't be fixed without re-papering — so order all your rolls, plus a spare, in one go.
Related tools
- Tile Calculator UK — sheets and coverage for floor or wall tiles
- Plasterboard / Drywall Calculator — sheets and screws for boarding walls and ceilings
- Stud Wall Calculator UK — timber and fixings for a new partition wall
Guides worth reading
- How Many Rolls of Wallpaper Do I Need? UK Guide — the drop-counting method, pattern repeat explained, and a full worked example
Disclaimer: This calculator gives a material estimate for planning and budgeting. Always confirm quantities against your actual roll dimensions, pattern repeat and wall measurements before ordering, and keep a spare roll from the same batch. For large, high-value or specialist installations, ask your decorator or supplier to confirm the order.