Wallpaper Calculator

Calculate how many rolls of wallpaper you need for any room, including a 10% waste buffer.

🔒Everything runs in your browser — nothing you enter is stored, sent anywhere, or seen by anyone. Privacy Policy

The wallpaper calculator tells you how many rolls to buy for any room. Enter the room width, length, and ceiling height, plus the dimensions of your chosen wallpaper roll and the number of doors and windows — the calculator returns the total wall area to cover and the number of rolls needed, including a 10% waste buffer for cuts and pattern matching. Buying too few rolls is a common and costly mistake. Wallpaper is produced in batches, and a roll from a different production run can have a subtle colour or texture variation that ruins the finished look. Getting the right quantity upfront — including the buffer — ensures you can complete the entire room from a single batch. The standard UK roll is 10 m long and 0.52 m wide (covering about 5.2 m² before waste). European rolls are often 10.05 m × 0.53 m. American double rolls are typically 33 feet × 27 inches (about 8.4 m²). Check your specific roll dimensions and enter them above for an accurate result.

How to Use the Wallpaper Calculator

The Wallpaper Calculator is designed to give you an accurate answer in seconds. Follow these steps:

1Enter your room width (m) in the Room Width (m) field. The minimum value is 1. The default is 4 m. Adjust this to match your specific situation.
2Enter your room length (m) in the Room Length (m) field. The minimum value is 1. The default is 5 m. Adjust this to match your specific situation.
3Enter your ceiling height (m) in the Ceiling Height (m) field. The valid range is 2 to 4. The default is 2.5 m. Adjust this to match your specific situation.
4Enter your wallpaper roll width (m) in the Wallpaper Roll Width (m) field. The minimum value is 0.1. The default is 0.52 m. Adjust this to match your specific situation.
5Enter your wallpaper roll length (m) in the Wallpaper Roll Length (m) field. The minimum value is 1. The default is 10 m. Adjust this to match your specific situation.
6Enter your number of doors in the Number of Doors field. The valid range is 0 to 6. The default is 1. Adjust this to match your specific situation.
7Enter your number of windows in the Number of Windows field. The valid range is 0 to 10. The default is 2. Adjust this to match your specific situation.
8Click Calculate to see your results instantly. The output updates as soon as you submit.

No account or sign-up required. All calculations run locally in your browser — nothing is stored or transmitted to any server.

Example Calculation

Here is what the Wallpaper Calculator produces with its default values. Change any input above to recalculate instantly for your own figures.

Inputs

Room Width (m)4 m
Room Length (m)5 m
Ceiling Height (m)2.5 m
Wallpaper Roll Width (m)0.52 m
Wallpaper Roll Length (m)10 m
Number of Doors1
Number of Windows2

Results

Wall Area to Cover (m²)40.0 m²
Rolls Needed (incl. 10% waste)9 rolls

How It Works

Rolls = ⌈(Wall Area ÷ Roll Coverage) × 1.1⌉

Formula: Rolls = ⌈(Wall Area ÷ Roll Coverage) × 1.1⌉ Wall area = 2 × (Width + Length) × Height − (Doors × 2 m²) − (Windows × 1.5 m²) Roll coverage = Roll Width × Roll Length Example: 5 m × 4 m room, 2.5 m ceiling, 1 door, 2 windows. Standard UK roll (0.52 m × 10 m = 5.2 m²). Perimeter area = 2 × (5 + 4) × 2.5 = 45 m² Subtract doors/windows = 45 − 2 − 3 = 40 m² Rolls before waste = 40 ÷ 5.2 = 7.69 With 10% waste = 7.69 × 1.1 = 8.46 → round up to 9 rolls For patterned wallpaper with large repeats (30+ cm), add another 10–15% to account for pattern-matching waste at each seam. Some patterns require dropping one full repeat per strip — this can add 2–3 extra rolls for a large room.

Frequently Asked Questions

How many rolls of wallpaper do I need for a room?

A standard bedroom (4 m × 3.5 m, 2.5 m ceiling, 1 door, 1 window) needs approximately 8–9 standard UK rolls (0.52 m × 10 m). A larger living room (6 m × 5 m) typically needs 12–14 rolls. Enter your exact room dimensions and roll size in the calculator for a precise figure with the 10% buffer included.

How much extra wallpaper should I buy for pattern matching?

For plain or small-repeat patterns (repeat under 15 cm), a 10% waste buffer is usually sufficient. For large-repeat patterns (30+ cm), add 15–20% extra to account for drops lost at each seam. A 60 cm pattern repeat means up to one full drop wasted per strip — in a room with 20 strips, that could waste 3–4 metres of wallpaper. Ask the supplier for the pattern repeat measurement and factor it in.

What is a standard wallpaper roll size?

Standard UK and European rolls are typically 10 m long × 0.52–0.53 m wide, covering approximately 5.0–5.2 m² per roll before waste. American double rolls are 27 inches (0.686 m) wide × 27 feet (8.2 m) long, covering about 5.6 m². Wide-format commercial wallcoverings may be 1.0–1.37 m wide. Always check the specific roll dimensions on the product label and enter them in the calculator above.

Should I buy extra wallpaper rolls?

Yes — always buy at least one extra roll and keep it for repairs. Wallpaper batches (dye lots) vary subtly in colour, meaning a replacement roll purchased later may not match your original. With a spare roll stored flat away from sunlight, you can patch damaged sections years later with a perfect match. The 10% buffer in this calculator helps, but keeping one full extra roll is good insurance on an expensive project.

Is the wallpaper calculator free?

Yes — free with no sign-up required. Enter your room dimensions and roll size for an instant roll count with a 10% waste buffer included. All calculations run in your browser and no data is stored.

Related Tools