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Wallpaper calculator

Estimate how many rolls of wallpaper you need for a room, including waste.

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The Wallpaper calculator turns Wall area (m²), Roll length (m), Roll width (m), Waste (%) into Rolls needed, instantly and for free. For instance, with Wall area (m²) = 30, Roll length (m) = 10, Roll width (m) = 0.53 and Waste (%) = 15 it returns Rolls needed = 7.

How to use it

  1. Enter your values: Wall area (m²), Roll length (m), Roll width (m), Waste (%).
  2. Read the result instantly: Rolls needed.

Frequently asked questions

What does the Wallpaper calculator actually compute?

It takes Wall area (m²), Roll length (m), Roll width (m) and Waste (%) and derives Rolls needed from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

4 values: Wall area (m²), Roll length (m), Roll width (m) and Waste (%). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Wall area (m²) = 30, Roll length (m) = 10, Roll width (m) = 0.53 and Waste (%) = 15, the calculator returns Rolls needed = 7. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Buying the right amount at the merchant: how many tiles, how much paint, how many bags of concrete, and what it all comes to.

What is the most common mistake?

Ordering the exact calculated quantity. Cuts, breakage and pattern matching mean tiles need 10% spare and more on a diagonal layout — and a second batch rarely matches the first for colour.

How accurate is it, and what are the limits?

Estimate only — confirm quantities with your supplier.

What is the difference between the Wallpaper calculator and the Brick calculator?

This one returns Rolls needed; the Brick calculator returns Bricks needed and Bricks per m². That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Concrete blocks calculator is the closest one after this: Estimate the number of concrete blocks needed to build a wall.

What else is worth having open alongside it?

Concrete calculator and Cubic yard calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

The geometry is exact for the dimensions you enter. Coverage rates come from manufacturer datasheets and vary with the surface, the number of coats and how absorbent the substrate is.

Further reading

All guides →
How-toHow Much Wallpaper Do You Need?Measure the wall area, divide by a roll's usable coverage, then add for pattern repeat. Here's the method, with an example and why batch numbers matter.How-toHow Much Wallpaper With a Pattern Repeat?Count wallpaper rolls correctly when the pattern repeats: how repeat length creates waste on every strip, and how to turn wall area into the number of rolls to buy.How-toHow Much Paint Do You Need to Paint a Room?Estimate paint by wall area, coats and the coverage on the tin — with a worked example and the 10% rule so you buy once and match the colour.How-toWhat TV Size Is Right for My Room?Turn your viewing distance into a recommended screen diagonal in inches, so a 4K TV fills your field of view without straining your eyes.How-toHow Much Concrete Do You Need?Concrete is measured by volume: length × width × depth. Here's how to work out cubic metres, add for waste, and choose bags or ready-mix.How-toHow to Calculate Pool Volume: A Formula per Shape, and the Depth TrapLength × width × average depth gives 21,065 gallons for a 32 by 16 ft pool. But average depth only means (shallow + deep) ÷ 2 when the floor slopes evenly, and most pools do not. Here is every shape formula and the correction.