This wallpaper calculator helps you determine how many rolls of wallpaper you need for any room. Enter your room dimensions, roll specifications, and pattern repeat to get instant estimates. Accounts for pattern matching, doors, and windows to minimize waste.
Wallpaper Calculator
Common Wallpaper Roll Sizes
Standard roll dimensions vary by region and manufacturer. Use this reference to enter the correct specifications for your wallpaper.
| Region/Type | Width | Length | Coverage | Notes |
|---|---|---|---|---|
| US Standard | 20.5" (52cm) | 33 ft (10m) | 56 sq ft | Most common in North America |
| European Standard | 21" (53cm) | 33 ft (10m) | 58 sq ft | Slightly wider than US |
| UK Standard | 21" (53cm) | 33 ft (10m) | 58 sq ft | Same as European |
| Commercial/Wide | 27" (69cm) | 50 ft (15m) | 112 sq ft | Less common, fewer seams |
| Metric Standard | 53 cm | 10 m | 5.3 sq m | International standard |
| Designer/Premium | 27" (69cm) | 27 ft (8.2m) | 60 sq ft | High-end wallpapers |
How to Measure a Room for Wallpaper
Accurate measurements and understanding pattern repeat are essential for calculating the correct number of rolls and minimizing waste.
Step 1: Measure Wall Perimeter
Measure the length of each wall and add them together to get the total perimeter. For a rectangular room, calculate: 2 x (length + width). Measure at the height where you will hang the wallpaper, as walls are not always perfectly square.
Step 2: Measure Wall Height
Measure from the ceiling (or where wallpaper will start) to the baseboard. Add 3-4 inches for trimming at top and bottom. This ensures you have enough overlap for precise cutting.
Step 3: Account for Pattern Repeat
Pattern repeat is the vertical distance before the pattern repeats itself. Check the wallpaper label or roll for this measurement. Larger pattern repeats create more waste because you must align patterns across strips. For plain or random-match patterns, pattern repeat is 0.
Step 4: Subtract Doors and Windows
Most professionals subtract doors but NOT windows, as windows require cutting around and create irregular pieces. For large openings like patio doors or bay windows, you can subtract those. This calculator subtracts both for conservative estimates.
Step 5: Add 10-15% Extra
Always buy 1-2 extra rolls beyond the calculated amount. This accounts for pattern matching waste, mistakes, future repairs, and batch variations in color. Rolls from different production batches may have slight color differences.
Worked Example
Room: 12 ft x 10 ft with 8 ft ceilings, 1 door, 2 windows. Wallpaper: 20.5" wide x 33 ft long, 21" pattern repeat.
- Perimeter: 2(12 + 10) = 44 ft = 528 inches
- Wall height: 8 ft = 96 inches (add 4" for trim = 100 inches needed per strip)
- Pattern repeat: 21 inches. Usable length per strip with repeat: (33 ft x 12 = 396 inches) / (100 + 21) = 3.27 strips per roll, round down to 3 strips
- Strips needed: 528 inches / 20.5 inches = 25.76, round up to 26 strips
- Rolls needed: 26 strips / 3 strips per roll = 8.67 rolls, round up to 9 rolls
Pattern Repeat Types
Understanding your wallpaper's pattern type affects waste calculations and installation complexity.
Straight Match
Pattern aligns horizontally across strips at the same level. Easier to install, less waste. Pattern repeat is the vertical distance before it repeats. Typical waste: 15-20%.
Drop Match (Half Drop)
Pattern on adjacent strips drops by half the pattern repeat. More complex to install, more waste. The pattern repeat number on the label indicates the full vertical repeat. Typical waste: 20-30%.
Random Match
No pattern to match - textures, solid colors, or random patterns. Easiest to install, minimal waste. Set pattern repeat to 0 in the calculator. Typical waste: 5-10%.
Free Match
Pattern exists but does not need to align at seams. Stripes, vertical patterns. Easy to install. Set pattern repeat to 0. Typical waste: 5-10%.
About This Wallpaper Calculator
This calculator uses room dimensions, roll specifications, and pattern repeat to estimate how many wallpaper rolls you need. It accounts for pattern matching waste, which is critical for accurate estimates.
How It Works
- Wall perimeter: Calculated as 2(length + width)
- Strips per roll: Roll length divided by (wall height + pattern repeat), rounded down
- Total strips needed: Wall perimeter divided by roll width, rounded up
- Subtractions: Standard door = 21 sq ft, standard window = 15 sq ft
- Rolls needed: Total strips divided by strips per roll, always rounded up
- Pattern repeat waste: Automatically calculated - larger repeats reduce usable strips per roll
Tips for Accurate Estimates
- Check the wallpaper label for exact roll dimensions and pattern repeat
- Order all rolls at once from the same production batch to ensure color consistency
- For complex rooms with many corners or angles, add 1-2 extra rolls
- Large pattern repeats (over 24 inches) create significant waste - buy extra
- Save leftover rolls for future repairs - wallpaper patterns get discontinued
- If pattern repeat is not listed, measure it directly on the roll before calculating
Wallpaper Calculator FAQ
How many rolls of wallpaper do I need for one wall?
For a single wall, measure wall width and height. Divide width by roll width to get number of strips. Divide roll length by (wall height + pattern repeat) to get strips per roll. Divide total strips by strips per roll and round up. For an 8 ft high x 10 ft wide wall with 20.5" wide rolls, you need about 6 strips, or 2 rolls (3 strips per roll).
What is pattern repeat and why does it matter?
Pattern repeat is the vertical distance before the wallpaper pattern repeats itself. It matters because you must align patterns across adjacent strips, which creates waste. A 21-inch pattern repeat means each strip wastes up to 21 inches per cut. Larger repeats mean fewer usable strips per roll, so you need more rolls. Random match patterns have 0 repeat and minimal waste.
Should I subtract doors and windows?
Yes for large openings like doors and patio doors. Windows are debatable - professional installers often do NOT subtract windows because you must cut around them, creating irregular pieces that are hard to reuse. This calculator subtracts both for conservative estimates, but consider not subtracting windows if you want extra margin.
How much extra wallpaper should I buy?
Buy at least 1-2 extra rolls (10-15% more than calculated). This covers pattern matching waste, installation mistakes, future repairs, and batch color variations. Wallpaper patterns get discontinued, so you cannot always reorder later. Leftover rolls can be returned to some retailers if unopened.
What if my wallpaper roll size is different?
Enter your actual roll dimensions in the "Wallpaper Roll Specifications" section. Common sizes are 20.5" x 33 ft (US), 21" x 33 ft (UK/Europe), or 53 cm x 10 m (metric). Check the label on your wallpaper roll for exact dimensions. Designer wallpapers often have non-standard sizes.
How do I measure pattern repeat?
Check the wallpaper label first - it usually lists pattern repeat. If not listed, unroll the wallpaper and measure the vertical distance from one point in the pattern to where that exact point repeats. For half-drop patterns, the label shows the full repeat. If there is no pattern to match, enter 0.
Can I use this calculator for textured or embossed wallpaper?
Yes. Enter the roll dimensions and pattern repeat as usual. Textured and embossed wallpapers often have no pattern repeat (enter 0), but check the label. These wallpapers are more forgiving at seams because texture hides minor misalignments.
What if my ceiling height varies?
Use the tallest ceiling height in your calculation. You will trim excess at the bottom where ceilings are lower. For rooms with sloped ceilings (like attics), measure the longest vertical run and add 10% extra for waste due to angled cuts.
Does this calculator work for peel-and-stick wallpaper?
Yes. Peel-and-stick wallpaper comes in various sizes, so enter the exact dimensions. Most peel-and-stick wallpapers have straight match or no pattern, making installation easier with less waste. However, buy extra because mistakes are harder to correct than with traditional wallpaper.
How much does wallpaper cost?
Wallpaper prices range from $20-$150+ per roll depending on quality and design. Budget wallpaper: $20-40. Mid-range: $40-80. Designer/premium: $80-150+. Enter your price per roll to get a total cost estimate. Professional installation adds $1-3 per square foot.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates and may vary based on actual conditions.
Related Tools
- Line Chart Generator -- Create customizable line charts with multiple series and smooth or straight
- World Clock -- View current time in multiple cities and time zones simultaneously
- Asphalt Calculator -- Calculate hot mix asphalt tonnage and cost for driveways, parking lots, and
- Shopping List Builder -- Build a smart shopping list with quantities, categories, and budget tracking
Related Tools
View all toolsSquare Footage Calculator
Calculate area in square feet from room dimensions for flooring, painting, and more
Tip Calculator
Calculate tip amount, total, and per-person split
Online Compass
Digital compass using your device's magnetometer sensor
Split Bill Calculator
Split a total evenly across a group
Receipt Total Calculator
Add line items, tax, discounts, tip, and split totals instantly
Shopping List Builder
Build a smart shopping list with quantities, categories, and budget tracking
Wallpaper Calculator FAQ
What is Wallpaper Calculator?
Wallpaper Calculator is a free utility & everyday tool that helps you Calculate how many rolls of wallpaper you need for any room with pattern repeat support.
How do I use Wallpaper Calculator?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Wallpaper Calculator private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Wallpaper Calculator require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Wallpaper Calculator?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Wallpaper Calculator?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.