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Wallpaper Calculator — How Many Rolls Do I Need?

Free wallpaper calculator. Calculate how many rolls of wallpaper you need for any room. Enter room dimensions and roll size for instant results.

🖼️Calculator

Room Length(m)

Room Width(m)

Wall Height(m)

Roll Width

Roll Length

Number of Doors

Number of Windows

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What is a Wallpaper — How Many Rolls Do I Need??

This free wallpaper calculator tells you exactly how many rolls of wallpaper you need for any room — so you never run short mid-wall or waste money over-ordering. The calculation is based on the total wall perimeter, wall height, the size of your wallpaper roll, and subtracts the area of doors and windows automatically. **How Many Rolls of Wallpaper Do I Need?** The answer depends on four variables: the total wall area to be covered, the dimensions of the wallpaper roll you have chosen, how many doors and windows break up the wall area, and pattern repeat (which adds waste for patterned paper). This wallpaper roll calculator handles the first three automatically — for patterned wallpaper, order 1–2 extra rolls to account for pattern matching at seams. **Standard Wallpaper Roll Sizes:** UK and European standard rolls are 53cm wide × 10m long (sometimes 10.05m), covering approximately 5.3 m² per roll. Wide rolls are 60–70cm wide. US double rolls are typically 60cm × 15m. Always check the roll label before ordering — roll dimensions vary between manufacturers and ranges. **Pattern Repeat:** Wallpaper with a large pattern repeat (30cm+) requires more waste because each strip must be cut to align the pattern at seams. Our calculator adds 10% waste, which covers small-pattern or plain wallpaper — for large-pattern designs (30cm+ repeat), order 15–20% extra or add 1–2 additional rolls.

How to Use This Calculator

Enter your room's length and width in meters. Enter the wall height in meters (typically 2.4–2.7m for standard UK rooms). Select your wallpaper roll width and roll length from the dropdowns — check your chosen wallpaper's label for exact roll dimensions. Enter the number of doors and standard windows in the room — these are deducted from the wall area automatically (using standard door area 0.9m × 2.1m and window area 1.2m × 1.2m). Click Calculate to see the total wall area, net area after deductions, area per roll, and the number of rolls needed with 10% waste included.

💡 Pro Tips

✓Always buy at least one extra roll beyond the calculator result — if you need to repair a section later, matching the exact batch (dye lot) is nearly impossible.
✓For plain or small-repeat wallpaper, 10% waste is sufficient. For large pattern repeats (30cm+), add 15–20% or buy 2 extra rolls.
✓Measure your wall height to the ceiling, not just where the old wallpaper ends — ceilings are often higher than you think.
✓If in doubt between two quantities, always round up — wallpaper cannot be bought in fractions of a roll.
✓Store leftover rolls in the original packaging for future repairs — paper from a different batch will never match perfectly.
✓For rooms with large feature walls or unusual layouts (bay windows, chimney breasts), measure each section separately and add them together.

Who Uses This Calculator?

Homeowners redecorating a bedroom, living room, or hallway who need to know how many rolls to buy before visiting a wallpaper shop. Interior designers estimating material costs for client projects. DIY decorators pricing up a wallpaper job before purchasing. Property developers specifying quantities for multiple rooms. Anyone asking "how many rolls of wallpaper do I need?" for any room size.