Wallpaper Calculator
Estimate the number of wallpaper rolls needed for your room. Enter your wall dimensions, account for doors and windows, and adjust for pattern repeat to get an accurate roll count. Perfect for interior design and home renovation projects.
What Is a Wallpaper Calculator?
A wallpaper calculator is a tool that helps you determine how many rolls of wallpaper you need for a room or wall. It calculates the total wall area, subtracts doors and windows, and adjusts for pattern repeat and waste to give you an accurate roll count.
This calculator supports two modes:
- Single Wall: For accent walls or single wall projects.
- Full Room: For entire rooms with multiple walls, doors, and windows.
How Does the Wallpaper Calculator Work?
The calculator follows these steps:
1. Calculate Wall Area: Single wall: width × height. Full room: (2 × (length + width)) × height.
2. Subtract Openings: Subtract door and window areas.
3. Apply Waste Factor: Add 10-15% for cuts, pattern matching, and mistakes.
4. Calculate Roll Coverage: Roll width × roll length (in square feet).
5. Adjust for Pattern Repeat: Subtract pattern repeat waste from each strip.
6. Determine Rolls Needed: Total area ÷ adjusted roll coverage, rounded up.
Standard wallpaper rolls are 20.5 inches wide and 33 feet long, covering about 56 square feet. Pattern repeat can significantly affect the amount of waste, so it's important to account for it.
Why Use This Wallpaper Calculator?
- Two Modes: Supports single wall and full room calculations.
- Unit Flexibility: Switch between imperial (feet) and metric (meters).
- Pattern Repeat: Accounts for waste caused by pattern matching.
- Waste & Cost: Add a waste factor and estimate total material cost.
- Free & Private: No registration, no data storage.
❓ Wallpaper Calculator FAQ
How do I calculate how much wallpaper I need?
Measure the width and height of each wall, calculate the total square footage, subtract doors and windows, and divide by the coverage per roll. Add 10-15% for waste and pattern matching.
What is the standard wallpaper roll size?
Standard wallpaper rolls are 20.5 inches wide and 33 feet long, covering about 56 square feet. Some rolls are 30, 36, or 45 feet long.
What is pattern repeat in wallpaper?
Pattern repeat is the distance between matching points in the wallpaper design. Larger repeats require more waste because you need to match the pattern across strips.
How much waste should I add for wallpaper?
Add 10-15% for waste, cuts, pattern matching, and mistakes. Increase to 20% for large pattern repeats or complex room layouts.
How do I account for doors and windows?
Subtract approximately 21 square feet for each standard door and 15 square feet for each standard window. You can adjust these values in the advanced options.
How many rolls of wallpaper do I need for a 10×10 room?
A 10×10 room with 8 ft ceilings has about 320 sq ft of wall area. With 10% waste and standard rolls covering 56 sq ft, you'd need about 7 rolls.
How many rolls of wallpaper do I need for a 12×12 room?
A 12×12 room with 8 ft ceilings has about 384 sq ft of wall area. With 10% waste and standard rolls covering 56 sq ft, you'd need about 8-9 rolls.
What is the best wallpaper for high-traffic areas?
Vinyl wallpaper is durable, washable, and ideal for high-traffic areas like hallways and kitchens. Grasscloth and fabric wallpapers are more delicate and better for low-traffic areas.
How do I prepare walls for wallpaper?
Walls should be clean, smooth, and dry. Fill holes and cracks, sand rough spots, and apply a primer or sizing agent to help the wallpaper adhere.
How do I measure a room for wallpaper?
Measure the height of each wall and the total width of all walls. Multiply to get the total square footage. Subtract doors and windows. Use the calculator to do the math.
What is the difference between paste-the-wall and paste-the-paper?
Paste-the-wall wallpaper has adhesive applied directly to the wall, making it easier to hang. Paste-the-paper requires adhesive applied to the back of the paper, which can be messier.
How do I remove old wallpaper?
Use a wallpaper scorer to perforate the paper, then apply a wallpaper stripping solution or warm water. Wait for the adhesive to soften, then scrape off the paper.
Can I wallpaper over existing wallpaper?
It's possible if the existing wallpaper is smooth, well-adhered, and not textured. However, it's generally recommended to remove old wallpaper for the best results.
How long does wallpaper last?
Quality wallpaper can last 10-15 years or more with proper care. Vinyl wallpaper is the most durable and can last even longer in low-traffic areas.
How do I clean wallpaper?
Vinyl wallpaper can be wiped with a damp cloth and mild soap. Fabric and grasscloth wallpapers require gentle vacuuming or dry cleaning.
What is a wallpaper drop?
A drop is a single strip of wallpaper cut to the height of the wall. The number of drops needed depends on the wall width and wallpaper width.
How do I calculate wallpaper for a single accent wall?
Use the Single Wall mode. Enter the wall width and height, and the calculator will give you the number of rolls needed for that one wall.