What is the difference between straight match and drop match patterns?

Straight match aligns horizontally: all strips begin at the same pattern point. Drop match alternates — every other strip is offset by half the repeat distance. Drop match wastes more material but looks more natural for many repeating designs. Always check the manufacturer's match type and repeat before calculating.

Should I subtract doors and windows from the wallpaper calculation?

Typically no. The savings from subtracting door and window areas are usually smaller than the risk of running out mid-install. It is better to over-order by one roll than to run out on day two of the project, because matching a dye lot is often impossible after a few weeks. Save the extra material for future repairs.

What do manufacturers mean by 'coverage' on a roll?

Manufacturers quote the area a roll theoretically covers — but that assumes ideal layout with no waste, no pattern repeat, and a wall height that exactly matches a clean multiple of the roll length. This calculator gives a realistic estimate accounting for wall-height cutting, pattern repeat, and waste. Expect actual useable area to be 70–90% of manufacturer's quoted coverage.

Can I calculate for a single feature wall?

Yes. Treat it as a room with only that wall. The relevant 'perimeter' is the wall width, and strip count equals wall width divided by roll width. Feature walls are typically 2–4 rolls, making them a popular low-risk way to introduce bold patterns without committing to a full room.

How do I estimate total wallpaper cost?

Multiply rolls needed by price per roll. Add 15–20% for installation supplies (paste, smoothing tools, liner paper, trim). For professional installation, labor typically adds PKR 200–500 per roll in Pakistan, or $40–80 per roll in the US — call local installers for accurate quotes.

What is the difference between pre-pasted and paste-the-wall wallpaper?

Pre-pasted wallpaper has dry paste applied to the back; you soak each strip in water before hanging. Paste-the-wall wallpaper requires you to apply paste to the wall, then hang the dry strip. Modern paste-the-wall is easier for beginners and less messy. Traditional pre-pasted wallpaper is often cheaper but harder to handle.

Can I reuse leftover wallpaper?

Yes — store leftovers flat or in a tube, away from moisture and direct sunlight. They remain usable for years for patches and repairs. Before doing a patch repair, verify that the roll number on the leftover matches your installed paper (dye lots vary) and test on a scrap area first.

Wallpaper Calculator

Construction

Calculate the number of wallpaper rolls needed for a room.

Construction

Wallpaper Calculator

Generated on April 24, 2026

Room (meters)

Width

Length

Height

Roll Specs (meters)

Roll Width

Roll Length

Pattern Repeat

Wall AreaNaN m²

Strips NeededNaN

Rolls Needed

Buy 1 extra roll for waste/mistakes.

Step-by-step calculation

Formula

Strips = ⌈perimeter ÷ roll width⌉. Rolls = ⌈strips ÷ strips-per-roll⌉

1Perimeter = 2 × (NaN + NaN) = NaN m
2Wall area = NaN × NaN = NaN m²
3Strip length = height + pattern repeat = NaN + 0 = NaN m
4Strips per roll = ⌊10 ÷ NaN⌋ = NaN
5Strips needed = ⌈NaN ÷ 0.53⌉ = NaN
6Rolls = ⌈NaN ÷ NaN⌉ = 0

?What is the Wallpaper Calculator?

A wallpaper calculator determines how many rolls you need for a room based on its dimensions, the size of the wallpaper roll, and the pattern repeat. Standard European rolls are 10.05 m long by 0.53 m wide; US rolls and custom sizes can vary. Large pattern repeats add waste because adjacent strips must be aligned to maintain the design — this can add 10–30% more rolls for intricate patterns. This tool is essential for decorators, homeowners, and contractors planning wallpaper installation, and it helps avoid both under-ordering (disaster if the dye lot is out of stock) and over-ordering (expensive wallpaper going to waste).

The Formula

Strips needed = Ceil(Perimeter ÷ Roll Width). Strips per roll = Floor(Roll Length ÷ (Wall Height + Pattern Repeat)). Rolls = Ceil(Strips ÷ Strips per roll).

The number of vertical strips needed to go around the room equals the room's perimeter divided by the roll width, rounded up. Each strip must be at least as tall as the wall, plus an allowance for pattern matching (the pattern repeat). Dividing the roll length by the strip length gives how many strips come out of one roll. Total rolls equals total strips divided by strips per roll, rounded up. Always buy one extra roll as a reserve for future repairs.

Practical Examples

A 4 × 5 m room with 2.7 m walls, a 0.53 × 10 m roll, and no pattern repeat needs 6 rolls — enough for one room with minimal waste.

A large pattern repeat of 64 cm can require 20–30% more rolls because each strip needs extra length to match the pattern.

Random-match patterns (which align on any line) are the most economical — no pattern-alignment waste at all.

Always buy one extra roll and store it sealed; future repairs may require color-matched material that is no longer in the original dye lot.

For a single feature wall (accent wall), the perimeter equals the wall length times 2 — a focused and popular use of patterned wallpaper.

Allow 10% more on removable/peelable wallpapers because the edges tend to lift during installation and may need trimming.

Frequently Asked Questions

Pattern repeat is the vertical distance between two points where the wallpaper design repeats identically. On a roll with a 64 cm repeat, every 64 cm the pattern starts over. When hanging, each new strip must begin at a position that aligns the pattern with the previous strip — which means cutting off material until the pattern lines up. Large repeats therefore waste more paper.

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Wallpaper Calculator

Wallpaper Calculator

Room (meters)

Roll Specs (meters)

Step-by-step calculation

?What is the Wallpaper Calculator?

The Formula

Practical Examples

Frequently Asked Questions

What is pattern repeat and why does it matter?

What is the difference between straight match and drop match patterns?

Should I subtract doors and windows from the wallpaper calculation?

What do manufacturers mean by 'coverage' on a roll?

Can I calculate for a single feature wall?

How do I estimate total wallpaper cost?

What is the difference between pre-pasted and paste-the-wall wallpaper?

Can I reuse leftover wallpaper?

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