PROJECTMETER
Calculators/Wallpaper

Wallpaper Calculator

Estimate net wall area and complete wallpaper rolls after openings, pattern waste and roll coverage.

Free · No signup · Reviewed August 22, 2026
Step 1
Set your project size

Use the finished area you plan to cover, then refine the assumptions below.

Step 2 · Visual referenceCheck the active area
Interior wallpaper installation reference
Gross walls352 ft²Openings36 ft²Net coverage316 ft²

Why it mattersSee covered walls, opening deductions and the net roll coverage.

Reference image; figures update from your measurements.

You’ll need

7 wallpaper rolls
Shopping list
7complete wallpaper rolls
363.4sq ft to cover
1 room$315.00 primary material estimate

Project shopping list

Use your result as a starting point, then confirm package coverage, product instructions and local requirements before purchasing.

MaterialWallpaperPackagewallpaper rollAllowanceIncluded

How the calculation works

net wall area × (1 + pattern waste) ÷ roll coverage

Enter each project area, choose the measurement system, then adjust waste and real package coverage. Packaged materials round up so the shopping list never suggests part of a box, sheet or panel.

MEASURE WITH CONFIDENCE

How to use the wallpaper calculator

Measure room length, width and wall height, deduct doors and large windows, then allow for pattern matching and trimming. ProjectMeter divides the net order area by usable coverage and rounds up to complete wallpaper rolls.

Formula and guidance reviewed August 22, 2026. Always confirm the final order with product instructions and project requirements.
STEP BY STEP

What to measure

  1. 01

    Measure the room perimeter

    Measure wall-to-wall length and width at floor level. The calculator uses twice the combined length and width to represent four walls. Add spaces with different heights as separate rooms.

  2. 02

    Measure wall height

    Measure from finished floor or baseboard line to the ceiling. Use the tallest practical drop when ceilings vary, because every wallpaper strip must be cut long enough before trimming.

  3. 03

    Count major openings

    Enter standard doors and large windows to remove their approximate area. Small openings may not reduce the roll order because surrounding drops, matching and offcuts still consume material.

  4. 04

    Use usable roll coverage

    Enter the usable square-foot or square-metre coverage supplied for the exact wallpaper. Pattern repeat, roll width and drop length can reduce usable coverage even when two rolls have the same nominal area.

WORKED EXAMPLE

12 × 10 ft room with 8 ft walls

  • 1 standard door and 1 large window
  • 15% pattern and trimming allowance
  • 56 sq ft usable coverage per roll
  • Four room walls
Calculated result

Gross wall area is 352 sq ft and estimated openings remove 36 sq ft. After the 15% allowance, 363.4 sq ft is ordered, so the calculator rounds up to 7 complete rolls.

Try your own measurements ↑
AVOID COSTLY REWORK

Common mistakes before you buy

  • Buy rolls from the same batch or dye lot and keep every label until the installation is complete.
  • Large pattern repeats, half-drop matches and short leftover pieces can require more rolls than a simple area calculation; check the product calculator and hanging instructions.
  • Primer, lining paper, paste, seam tools and wall repairs are separate materials, and some modern wallcoverings use paste-the-wall installation methods.
FROM QUANTITY TO BUDGET

Compare the complete project cost

Your material quantity is only one part of a quote. Preparation, removal, access, finishing and local labour can change the installed total.

Install wallpaper$325–$825Budget wallpaper by wall area, roll yield, pattern repeat, wall preparation, material type and room complexity.Read cost guide →Remove wallpaper$423–$1,192Budget wallpaper stripping by wall area, material layers, adhesive, wall condition, height, repairs and final decoration.Read cost guide →
MEASURE BEFORE YOU ORDER

Planning guides for this calculator

Use the live model for feedback, then use these guides to verify the dimensions and material assumptions behind the result.

Measure & estimateHow to Measure for WallpaperMeasure wall drops, openings and roll coverage while accounting for pattern repeat and usable roll length.Read guide →Choose & planWallpaper Pattern Repeat and WasteUnderstand straight match, half-drop match and repeat-adjusted cuts before selecting a wallpaper waste allowance.Read guide →Compare materialsPaste-the-Wall vs Prepasted vs Peel-and-Stick WallpaperCompare common wallpaper installation types by wall condition, repositioning, removal, pattern matching and long-term adhesion.Read guide →Specify & buyVinyl vs Nonwoven vs Paper WallpaperSelect wallcovering construction by cleaning, breathability, seam handling, room exposure and substrate.Read guide →Plan a projectWallpaper Accent Wall PlanningPlace a wallpaper motif on one focal wall while planning roll drops, corners, outlets and the visible starting line.Read guide →Avoid failuresHow to Prevent Wallpaper Bubbles and Open SeamsReduce trapped air, poor adhesion and seam lift through wall preparation, adhesive coverage, booking and controlled smoothing.Read guide →Time the workWallpaper Drying and Room-Condition PlanningStabilize walls, room air and ventilation so seams and pattern are not stressed during drying.Read guide →Protect & maintainHow to Store Leftover WallpaperPreserve labelled matching drops and rolls for a future repair without crushing edges.Read guide →Manage the projectWallcovering installation: Budget, Quotes, Safety and CloseoutManage a complete wallcovering installation project from measured quantity and comparable bids through safety checks, maintenance records and final acceptance.Read guide →Worked exampleWallpaper Rolls for a 12 × 12 RoomEstimate rolls for an 8 ft high 12 ft square room with one door, two windows, 15% pattern allowance and 56 sq ft usable coverage.Read guide →Worked exampleWallpaper Rolls for a 12 Ft Accent WallPlan an 8 ft high, 12 ft wide accent wall with one window using a 15% allowance and 56 sq ft usable roll coverage.Read guide →Worked exampleWallpaper Pattern Repeat Roll CalculationTranslate wall height and vertical repeat into cut length before counting wallpaper drops and rolls.Read guide →
TAKE THE PLAN TO THE SITE

Interactive project checklists

Use the pre-order list before material arrives, then save the inspection and maintenance list for closeout and future care.

WALLPAPER · READYWallpaper Order and Hanging ChecklistVerify rolls, batch, matched drops, wall preparation, adhesive and focal layout before cutting.Open 12-task checklist →WALLPAPER · CAREWallpaper Closeout and Care ChecklistInspect seams, bubbles, pattern and paste residue, then document cleaning and repair stock.Open 12-task checklist →
COMMON QUESTIONS

Wallpaper calculator FAQ

Should I subtract doors and windows?

Large openings can be deducted, but small openings often do not reduce the order because adjacent strips still need full-height cuts. This tool uses editable counts with standard planning deductions.

Why is pattern waste important?

Repeating motifs must align from one drop to the next. Matching can move the start point of each strip and leave unusable offcuts, especially with large or half-drop repeats.

What does usable coverage per roll mean?

It is the area you can realistically hang from one roll after its width, length, wall drop and pattern repeat are considered. Use the manufacturer or retailer product value whenever available.

KEEP PLANNING
Paint CalculatorEstimate paint and primer for walls after doors, windows, coats and waste.Drywall CalculatorEstimate net wall and optional ceiling area after doors and large windows.Siding CalculatorEstimate vinyl siding squares for straight exterior walls after door and window deductions.

Plan accurately. Build safely.

This calculator is a planning estimate, not engineering or code approval. Follow manufacturer instructions and consult a qualified professional for structural, electrical, gas or permit-sensitive work.