Wallpaper Calculator

Ordering wallpaper by area alone underbuys every time, because a roll does not cover its full square-metre label on a real wall. The honest way to count rolls is by strips: how many strips your ceiling height gives out of one roll, then how many strips wide the room is. Pattern repeat makes the strip cut longer than the wall, which is where the extra rolls come from.

Wallpaper Calculator counts rolls from either a measured wall area or full room dimensions, using your roll width and length, wall height and pattern repeat. It works out strips per roll, usable coverage per roll, and the rolls to buy — in metres or feet, for standard, wide, US or custom rolls.

Underneath is a guide to roll sizes, pattern matching and the measuring method that avoids the classic shortfall. Everything runs in your browser; nothing is uploaded.

• By area or by room: Feed in a measured wall area or room length, width and height with doors and windows deducted.
• Roll presets: Standard 0.53×10.05 m, wide 0.69×10.05 m, US 0.52×10 m, or any custom width and length.
• Pattern repeat: Zero for random or plain, or a 0.32/0.53/0.64 m repeat that adds the matching waste.
• Strips-based maths: The calculator counts strips per roll and strips per wall — the accurate method — instead of a flat area guess.
• Wall height aware: Taller walls yield fewer strips per roll, which the estimate reflects automatically.
• Metric or imperial: Areas in m² and sq ft, with roll and room sizes in metres or feet.
• Wastage control: An adjustable allowance for cutting and trimming on top of pattern waste.
• Reports & export: Copy or download the estimate as text, CSV or JSON.
• Learning guide: Roll sizes, pattern matching and measuring method built into the tool.

1. Pick the input. Wall area, or room dimensions for an automatic area with doors and windows removed.
2. Set the unit and wall height. The height drives how many strips come from each roll.
3. Choose the roll. Standard, wide or US preset, or set your own roll width and length.
4. Set the pattern repeat. Exit zero for random match, or the real repeat printed on the roll.
5. Tune the wastage. 10% is a sensible allowance for cutting and trimming.
6. Read the rolls. Strips per roll, usable coverage and the rolls to buy appear instantly.
7. Export the order. Copy or download the estimate as text, CSV or JSON.

Example 1 — Standard bedroom. A 4 × 3 m room, 2.6 m walls, standard roll, no pattern: about 31.5 m² of wall gives roughly 6 rolls after one door and one window are removed.

Example 2 — Patterned feature wall. A 4 m wide wall at 2.6 m hung with a 0.53 m pattern repeat: each strip needs a 3.13 m cut, so rolls yield 3 strips instead of 3 and the 4 m wall needs about 3 rolls rather than 2.8.

Example 3 — Tall ceiling. A 3.4 m stair wall with a standard roll: a 10.05 m roll yields just 2 strips (2 × 3.4 = 6.8 m), so each roll covers only 1.06 m of width — noticeably fewer rolls-worth of coverage than a normal ceiling.

Example 4 — Shoe the wall by area. 25 m² of wall at standard rolls, 2.6 m height, no pattern: 3 strips per roll, 1.59 m wide coverage ≈ 6.9 m² usable per roll → about 4 rolls. Add wastage → round to 5.

Example 5 — Romanom US roll. A US 0.52 × 10 m roll on a 2.4 m wall gives 4 strips (4 × 2.4 = 9.6 m) covering 2.08 m of width — the calculator switches roll type and the answer changes accordingly.

• Buy the right number of rolls: Strips-based counting avoids the classic area-only shortfall.
• Pattern match handled: Repeat-size waste is built into the strips per roll instead of a flat guess.
• Any roll size: Standard, wide, US or fully custom roll dimensions.
• Room-accurate: Doors and windows come off the area automatically.
• Tall walls covered: The estimate reflects that higher ceilings eat strips per roll.
• Export the order: Text, CSV and JSON summaries drop straight into the shopping list.
• Free and private: No account, no watermark, nothing uploaded.