Calculateur de papier peint

Wallpaper Calculator

Use this wallpaper calculator to estimate how many rolls you need for a room and how much the project may cost. It accounts for wall size, roll dimensions, pattern repeat, and waste so you can plan purchases accurately.

How Roll Quantity Is Calculated

The core steps are:

1. Calculate total wall area.
2. Subtract large openings (doors/windows).
3. Convert wallpaper roll size to usable coverage.
4. Add waste for cuts, alignment, and pattern matching.

A simplified formula:

Rolls Needed = (Adjusted Wall Area / Usable Coverage per Roll)

The result is rounded up to whole rolls.

Example

Room Perimeter	Wall Height	Net Area	Pattern Waste	Rolls Needed
44 ft	8 ft	332 sq ft	10%	8 rolls
36 ft	9 ft	298 sq ft	12%	7 rolls
52 ft	8 ft	390 sq ft	15%	10 rolls

Inputs That Matter Most

• Pattern repeat: Large repeats increase offcuts and waste significantly.
• Wall height: Taller walls reduce the number of strips per roll.
• Room complexity: Corners, alcoves, and angled ceilings require extra material.
• Roll type: Double rolls, metric rolls, and region-specific packaging differ.

Tips

1. Buy at least one extra roll from the same dye lot to avoid color mismatch later.
2. Confirm roll dimensions and coverage from the manufacturer before ordering.
3. Save leftover labeled strips for future repairs around outlets and corners.
4. For feature walls, model several scenarios to compare pattern-heavy vs. plain papers on cost and waste.