Wallpaper Calculator
Estimate the rolls of wallpaper a room needs, including pattern-matching waste.
Calculator
| Double rolls | 7 rolls |
|---|---|
| Wall area | 312 ft² |
How it is calculated
Wall area 312 sq ft × 1.15 for pattern matching ÷ 28 sq ft usable per single roll = 13 single rolls (7 double rolls).
About this calculator
How much wallpaper you need depends on the wall area and the pattern. The calculator uses 28 square feet of usable paper per single roll and adds 15% for pattern matching and trimming, then shows single and double rolls.
A pattern repeat is the distance before the design repeats. Large repeats waste more paper because every strip must line up. Always check the usable coverage on the roll you plan to buy.
Worked examples
| Project | Single rolls (+15% waste) | Rough cost |
|---|---|---|
| a 12x12 ft room with 8 ft walls | 13 rolls | $260 – $1,300 |
| a 10x10 ft room with 8 ft walls | 12 rolls | $240 – $1,200 |
| a 14x16 ft room with 9 ft walls | 19 rolls | $380 – $1,900 |
| a 20x20 ft room with 10 ft walls | 29 rolls | $580 – $2,900 |
Buying notes
- Buy all rolls from the same print batch so colors match.
- Ask the manufacturer for the pattern repeat and usable coverage per roll.
- Prepare walls first: fill holes, sand and prime so the paper sticks well.
Quick answers by size
Click a size for the exact quantity and cost.
How to measure and use this calculator
- Measure the room's length, width and wall height.
- Subtract doors and windows.
- Check the usable coverage per roll on your paper, which depends on pattern repeat.
- Buy rolls from the same batch.
Common mistakes
- Skipping extra for large pattern repeats.
- Assuming a roll covers its full printed area.
- Hanging over unprepared, glossy walls.
Tips
- Large repeating patterns waste more paper; add extra for them.
- Buy all rolls from the same print batch to avoid color differences.
- Check the roll's usable coverage; the 28 sq ft used here is a common figure for a single roll.
Frequently asked questions
How many rolls of wallpaper for a room?
Measure the wall area, subtract openings, then divide by the roll's usable coverage and add about 15%.
What is a pattern repeat?
It is the vertical distance before a design repeats. The larger it is, the more paper you waste matching strips.
What is a double roll of wallpaper?
A double roll is sold as two single rolls' worth of paper on one roll. Coverage varies by brand, so check the label.