Wallpaper Calculator
Estimate complete wallpaper rolls, full-height strips, and optional paste packs for one wall, multiple same-height walls, or a room in US customary or Canadian metric units.
The roll estimate accounts for straight pattern repeat, total top-and-bottom trimming, and an additional strip allowance. Opening area reduces paste needs but not full-height strip count.
🌎 Region
📐 Wall Size
Enter the total length and consistent height of the wall area.
🚪 Doors, Windows & Openings
Enter the total area that does not need wallpaper.
Reduces net area and paste, but not full-height strip count.
🧻 Wallpaper Roll Details
Use the dimensions printed on the roll label.
🎨 Pattern & Trimming
Straight-match repeat and total top-and-bottom trimming allowance.
⚠️ Waste Allowance
Extra full strips for mistakes, damage, difficult cuts, and repairs.
Recommended Guidelines
• 10% — Standard wallpaper projects
• 15% — Corners, difficult cuts, or beginner DIY work
• 20% — Complex rooms or additional repair material
🪣 Wallpaper Paste Coverage
Enter the coverage printed on one paste pack or bucket.
Leave blank for peel-and-stick wallpaper or when paste is not required.
Wall Area
—
sq ft
Net Wall Area
—
sq ft
Usable Roll Coverage
—
sq ft / roll
Paste Needed
—
packs
—
Wallpaper Rolls Needed
Additional strip allowance: —
🪣 — Paste Packs
Based on — sq ft per pack
Estimate disclaimer: This estimate is for planning purposes only. Actual costs may vary based on location, material prices, labor rates, taxes, fees, exchange rates, and project conditions.
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What this calculator estimates
Calculate the full-width strips required across the wall, then determine how many full-height, pattern-matched strips fit in one roll. Divide the total strips by the usable strips per roll and round up to the next complete roll. Taller walls, larger repeats, and extra trimming can reduce the number of strips per roll.
📘 How It Works
Gross Wall Area = Total Wall Length × Consistent Wall Height
Net Wall Area = Gross Wall Area − Entered Opening Area, with a minimum of zero
Cut Length = Wall Height + Total Trimming Allowance
Matched Length = Cut Length rounded up to the next straight pattern repeat
Strips Needed = Wall Length ÷ Roll Width, rounded up
Total Strips = Strips Needed × (1 + Additional Strip % ÷ 100), rounded up
Strips per Roll = Roll Length ÷ Matched Strip Length, rounded down
Rolls Needed = Total Strips ÷ Strips per Roll, rounded up
Paste Packs = Net Wall Area ÷ Label Coverage per Pack, rounded up when paste coverage is entered
🎯 When to Use
- 🧱 Accent and feature walls
- 🛏️ Bedrooms, nurseries, and living rooms
- 🚪 Walls with doors and windows
- 🎨 Straight-match patterned wallpaper
- 🧻 Traditional or peel-and-stick rolls
- 🇺🇸 US and 🇨🇦 Canadian projects
🧮 Worked Example Using the Production Formula
A 24 ft wall at 8 ft high uses 24 in wide wallpaper. With 4 in of total trimming and a 24 in straight repeat, each 100 in cut rounds up to a 10 ft matched drop. The wall requires 12 base strips.
A 10% allowance produces 14 total strips. A 40 ft roll supplies 4 matched strips, so the calculator returns 4 complete rolls. Subtracting 20 sq ft of openings leaves 172 sq ft for paste, or 2 packs at 100 sq ft per pack.
🇺🇸 Wallpaper Planning Guide for US Projects
Use US customary units
Enter wall and roll lengths in feet, roll width, repeat, and trimming in inches, and opening or paste coverage in square feet.
Use one consistent wall height
Combine wall lengths only when the walls have the same height. Calculate different-height sections separately.
Check the roll label
Roll sizes, single-roll and double-roll packaging, panels, and product coverage vary by manufacturer.
Understand opening deductions
Door and window area reduces paste coverage, but exact strip savings require each opening’s position, width, and height.
Buy from the same batch
Ordering an appropriate spare roll from the same dye lot can help with future repairs and colour consistency.
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❓ FAQ
Do doors and windows reduce the wallpaper roll count?
Door and window deductions reduce net wall area and the paste estimate, but they do not automatically reduce full-height strip or roll counts. The position and dimensions of each opening are needed to determine whether offcuts can be reused.
What is wallpaper pattern repeat?
Pattern repeat is the vertical distance before a design repeats. This calculator rounds each strip length up to the next complete straight-match repeat. Half-drop, offset, reverse-hang, and special matching layouts may require additional material.
Can I calculate wallpaper for a whole room?
Yes. Add the lengths of walls that share the same height and enter the combined length. Calculate different-height walls or sections separately.
Can I use it for peel-and-stick wallpaper?
Yes. Enter the product width and length as shown on its label. Paste may not be needed, so you can leave paste coverage blank.
Why does the calculator say the roll is too short?
The selected roll cannot produce one full-height strip after trimming and straight pattern matching. Check the roll length, wall height, trimming allowance, and repeat measurement.
What is a wallpaper double roll?
Single roll and double roll can describe packaging or pricing conventions rather than one universal physical size. Always enter the actual width and length printed on the product label.
Why should wallpaper rolls have the same batch number?
Different dye lots can have small colour or finish variations. Buying the required rolls together and checking the batch number can reduce visible differences.
Is the wallpaper estimate exact?
It is a planning estimate for walls of one consistent height. Actual requirements can change because of openings, corners, damaged material, batch matching, installation method, and whether offcuts can be reused.
Calculation Scope and Review
This calculator was reviewed against its production calculation logic on August 21, 2026. It estimates full-height strips for one wall or combined same-height walls, straight pattern repeat, trimming, an additional strip allowance, complete rolls, and optional paste packs. Opening area affects net area and paste only.
It does not model half-drop or offset matching, different wall heights in one run, corners, the position of openings, reusable offcuts, murals, panels, substrate preparation, labour, price, or exact installer layout. Confirm physical roll dimensions, match type, repeat, paste coverage, packaging, and dye lot on the product label. Consult an experienced wallpaper installer for complex or high-value projects.