Wallpaper Calculator UK
Calculate exactly how many wallpaper rolls you need for any room. Handles pattern repeats, multiple rooms, and standard UK roll sizes. Export a buying sheet as PDF, CSV or clipboard.
Wallpaper Settings
Rooms
How to Calculate How Many Rolls of Wallpaper You Need
The standard method used by professional decorators in the UK:
- Measure the room perimeter — add up the width of every wall you're papering. A 4m × 3m room has a perimeter of 14 metres.
- Subtract openings — deduct the width of doors and windows. A standard door is 0.8m wide and a window about 1.2m.
- Calculate drops needed — divide the remaining perimeter by the roll width (0.53m for a standard UK roll). Round up to a whole number.
- Work out the drop length — this is the ceiling height plus trimming allowance (usually 10cm top and bottom). If your wallpaper has a pattern repeat, round up to the next full repeat.
- Calculate drops per roll — divide the roll length (10.05m) by your drop length. Round down to a whole number.
- Total rolls — divide the number of drops by drops per roll, and round up. Always buy an extra roll for mistakes.
Our calculator handles all of this automatically, including pattern repeat waste, which is the part most people get wrong.
UK Standard Wallpaper Roll Sizes
Wallpaper rolls in the UK follow a standard size. Knowing the dimensions helps you plan accurately:
| Type | Length | Width | Area per Roll |
|---|---|---|---|
| Standard UK | 10.05m | 0.53m (53cm) | 5.33 m² |
| European | 10.05m | 0.52m (52cm) | 5.23 m² |
| Oversized | 15.00m | 0.53m (53cm) | 7.95 m² |
| American (less common in UK) | 8.23m | 0.69m (27") | 5.68 m² |
Always check the roll dimensions printed on the label. Some designer wallpapers use non-standard widths (0.70m or 1.06m wide rolls).
Understanding Pattern Repeat
Pattern repeat is the distance before the wallpaper design repeats. It's the main cause of wallpaper waste and the reason people buy too few rolls.
- Free match / plain — no pattern to match. Drops can be cut to exactly the wall height plus trimming allowance. Least waste.
- Straight match — the pattern lines up at the same point on every drop. Each drop must start at the same point in the pattern, so you may waste up to one full repeat per drop.
- Offset / half-drop match — alternate drops are shifted by half the pattern repeat. This creates a diagonal pattern and typically wastes more paper because every other drop needs an offset cut.
A 64cm pattern repeat on a 2.4m ceiling means each drop could waste up to 64cm of wallpaper — nearly two-thirds of a metre per drop. Over 20 drops, that adds up to several extra rolls. Our calculator accounts for this precisely.
Tips to Reduce Wallpaper Waste
- Choose free-match patterns for large rooms — stripes, textures and plains have zero pattern waste.
- Save offcuts — a long offcut from one drop can sometimes paper above a door or window.
- Start from a focal point — plan where your first drop goes so pattern mismatches end in a hidden corner.
- Check batch numbers — buy all rolls from the same batch to avoid colour variation. This is why buying one extra roll from the start is important.
- Use a plumb line — even one slightly wonky drop cascades into more waste as you try to correct it.
Frequently Asked Questions
How many rolls of wallpaper for a standard room?
A typical UK room (4m × 3m, 2.4m ceiling) with one door and one window needs approximately 7–8 rolls of standard wallpaper with no pattern repeat. With a 53cm pattern repeat, you'll need 9–10 rolls.
What size is a standard roll of wallpaper in the UK?
A standard UK wallpaper roll is 10.05 metres long and 0.53 metres (53cm) wide. This gives approximately 5.3 m² of wallpaper per roll.
Should I buy an extra roll?
Yes, always buy at least one extra roll. Wallpaper is manufactured in batches and colours can vary between batches. Having a spare roll also covers mistakes, future repairs and hard-to-paper areas like chimney breasts.
What is the difference between straight match and offset match?
With a straight match, every drop is identical — the pattern aligns at the same height. With an offset (half-drop) match, alternate drops are shifted down by half the pattern repeat, creating a diagonal effect. Offset patterns typically create more waste.
How much wallpaper paste do I need?
Most ready-mixed wallpaper paste covers 4–5 rolls per pack. Heavy-duty paste for vinyl or thick wallpapers covers 3–4 rolls. Our calculator estimates paste packs based on your total roll count.
Can I wallpaper over existing wallpaper?
It's not recommended. Old wallpaper can bubble, peel or show through. Strip the old wallpaper, fill any holes, sand smooth and apply a coat of wallpaper sizing before hanging new paper.