Wallpaper calculator
Estimate wallpaper rolls from room size, roll size and pattern repeat.
Fill in the fields and the result will appear here automatically.
Estimate wallpaper rolls from rectangular room dimensions, roll dimensions and a vertical pattern repeat. The calculation first finds whole strips, then whole rolls; it cannot turn unused fragments into another full strip. Window and door counts subtract fixed areas rather than the actual opening dimensions. The result is an aggregate material estimate to compare with a separate wall-by-wall cutting plan.
How it works
Formula and logic
Perimeter P = 2 × (length + width). The model subtracts a fixed 1.5 m² per window and 1.8 m² per door from P × height and clamps the remaining area to zero. Divide that area by height × roll width and round up to obtain strips. This uses equivalent total wall width, not a separate cutting plan or the actual dimensions of each opening. With repeat r in centimetres, strip length = ceiling(height/(r/100)) × r/100; without a repeat it equals height. Strips per roll are rounded down and rolls are rounded up. A roll yielding no full strip produces an error. Trimming allowance, half-drop matching and separate work above or below openings are not modeled. Window and door counts are non-negative whole numbers; roll price is in RUB.
Example
A 5 × 4 m room with 2.7 m walls, one window and one door has 45.3 m² in this model. A 1.06 × 10 m roll without repeat yields 3 strips; 16 strips require 6 rolls.
Fields and units
- Room length — m
- Room width — m
- Wall height — m
- Roll width — m
- Roll length — m
- Window count — items. Whole count; the model subtracts a fixed 1.5 m² per window. Actual sizes are not entered.
- Door count — items. Whole count; the model subtracts a fixed 1.8 m² per door. Actual sizes are not entered.
- Vertical repeat — cm. Vertical repeat in cm; blank or 0 means no repeat. Half-drop matching and trimming are not added.
- Price per roll — RUB. Price in RUB; no currency exchange. Blank or 0 hides cost.
How to use
- — Enter room dimensions.
- — Enter roll width and length.
- — Add doors, windows and pattern repeat.
Method and limitations
- Calculation method
- Formula and logic
- Limitation
- This uses equivalent total wall width, not a separate cutting plan or the actual dimensions of each opening. Trimming allowance, half-drop matching and separate work above or below openings are not modeled.
FAQ
How are wallpaper rolls estimated?
The calculator estimates the strips needed for the room walls and divides them by the usable strips from one roll.
Why enter doors, windows and pattern repeat?
Openings reduce the area to cover, while matching a repeated pattern can increase the length needed for each strip.
Could I still need an extra roll?
Yes. Cutting loss, wall shape and pattern matching can differ on site, so check the estimate against the room layout before purchasing.
Does the wallpaper estimate include half-drop matching?
No. Strip length is rounded to a whole vertical repeat; half-drop matching and trimming allowance are not added separately. Use the actual product matching instructions for a cutting plan.