Maker’s notebook · 6 min read
Dollhouse wallpaper calculator: sheets, repeats and spare paper
Work out how many printed sheets cover a miniature wall, why repeats and joins change the count, and how much paper to keep spare. Worked 1:12 example.
Updated
Wallpaper calculator
How many sheets for one wall?
Enter the wall at miniature size, as you measure it inside the dollhouse. Results update as you type. The count covers one wall; add each wall separately.
No sketch above 400 sheets: check the wall and pattern-area figures.
The count treats the wall as a plain rectangle: windows and doors are papered over, then cut out. Each Cabinet Douze design uses the pattern area of its own print files, as sold on Etsy.
A sheet count for a miniature wall is not the wall area divided by the paper area. Sheets are hung in columns and rows, the pattern has to continue across each join, and a printer never prints to the edge of the page. The calculator above follows those rules for one wall at a time and shows how much pattern ends up in the offcuts.
It uses the same arithmetic as the sheet table prepared with our print files, and it works in your browser without sending anything anywhere. For the printing itself, start with how to print dollhouse wallpaper at the correct scale.
Measure the walls at miniature size
Measure inside the dollhouse, in the unit you use at the bench. If you are planning a room that does not exist yet, convert its full-size walls first with the dollhouse scale calculator; a 3.66 m wall becomes 305 mm at 1:12.
Take the width wall to wall, at floor level and again under the ceiling. Walls are not always perfectly square, so enter the larger figure. Take the height from the floor to the ceiling, not to the top of a skirting board: skirting boards and door frames are fitted after the paper, and they hide its cut edges.
Treat each wall as a plain rectangle. Windows and doors are papered over, then cut out with a cross from corner to corner, and the flaps fold into the reveal. The sheets still have to span the opening, so it rarely changes the count. The exception is an opening so wide that it replaces a whole column of sheets, such as an arch between two rooms. Measure the papered strip on each side of it as a separate wall. Our room planning guide shows how to measure the usable walls around furniture you have already chosen.
Enter one wall at a time and add the results. At an inside corner, the offcut from the last sheet of one wall starts the next wall, so a wide offcut can save a sheet on a whole room. The calculator does not assume that saving; count it only when you see it on the dry-fitted walls.
Count the pattern area, not the page
Only the printed pattern covers the wall. On a prepared wallpaper sheet, the page also carries margins, crop marks and, on ours, a footer with a 20 mm test square and a sheet number. The useful figure is the width and height of the pattern area between the crop marks.
When that area is made of whole repeats, sheets butt-join: trimmed edge to edge, the pattern continues. Each Cabinet Douze design in the calculator uses the pattern area of its own print file, which is always a whole number of repeats. That is why two paper sizes can give different counts for the same wall. Floral Stripe has a 20 mm repeat at 1:12. Its A4 sheet holds nine repeats across, 180 mm, and its US Letter sheet holds ten, 200 mm, because Letter is a little wider. A 370 mm wall therefore needs three A4 sheets side by side but only two Letter sheets.
For a file of your own, choose “Another file” and type the pattern area you measure on a printed test sheet. The calculator starts from the page less a ¼ in margin on every side, but that is only a placeholder. Printers and files differ, and a count based on the page size will usually be optimistic.
Allow for repeats at every join
If your sheets are cropped wherever the page ends, the edges will not match when placed side by side. The usual fix is to overlap the next sheet until the motifs line up, then cut through both layers at once. Our guide to matching wallpaper patterns at seams and corners shows both kinds of join step by step.
Every overlap uses pattern that never reaches the wall. Choose “Overlap and double cut” and the calculator allows one repeat at every join, across and between rows. Lining up two motifs never needs a shift of a full repeat or more, so one repeat is a reasonable allowance for most sheets. A small pattern costs little; a 44 mm repeat, like several of our designs at 1:12, takes a visible bite out of each sheet.
The effect shows most on walls just over a whole number of sheets. With the Provence Blue Flower A4 pattern area at 1:12, a 360 mm wall takes two sheets butt-joined. With a 26.67 mm overlap at the join, two sheets reach only 346.71 mm, so the same wall needs three.
A worked example at 1:12
Take a back wall 305 mm wide and 254 mm high, about 12 × 10 inches, papered with Provence Blue Flower at 1:12. The pattern area of its A4 file is 186.69 × 240.03 mm: seven repeats across and nine down.
- Across: 305 ÷ 186.69 = 1.63, so two sheets.
- Down: 254 ÷ 240.03 = 1.06, so two rows. The wall is 14 mm taller than one sheet.
- Count: 2 × 2 = four A4 sheets. Add one spare and print five.
The second row is almost entirely offcut: 226 mm of pattern is trimmed above the top row. The notes prepared with our sheet layout suggest two ways round it. Put the row join high up, where a cornice will hide it, or use A3 or 11 × 17 paper. The A3 pattern area of the same design is 266.7 × 373.38 mm, which covers the full height: two A3 sheets side by side, and no horizontal join.
The same room at 1:24 is 152.5 × 127 mm. The 1:24 A4 file of this design has a 186.62 × 253.27 mm pattern area, so one sheet covers the wall.
The sheet table prepared with our print files counts a single row, across walls from 20 to 50 cm wide at 1:12. The calculator reproduces that table for every wall design, at both scales and on all four paper sizes. For Provence Blue Flower on A4, for example, both give two sheets for a 30 cm wall and three for a 40 cm wall.
Keep spare paper and check the layout
Print every sheet for a room from the same file, on the same paper, with the same settings, and keep at least one spare for a mistaken cut or a later repair. Rooms with many corners, or a first attempt at double cuts, justify a percentage instead. The calculator rounds a percentage up to whole sheets.
Before gluing, lay the printed sheets on the wall with low-tack tape and compare them with the sketch under the calculator. It shows each sheet’s pattern area from the bottom-left corner. If a join lands on the edge of a window or right behind the point everyone looks at, move the starting point rather than adding paper.
The Cabinet Douze wallpapers in the calculator are on sale on Etsy. Their pattern areas and repeats come from their prepared print files and our catalogue. The counts are digital calculations; we have not published printed or hung test walls.
Common questions
How many sheets of wallpaper does a 1:12 dollhouse room need?
It depends on the walls and on the printed pattern area of each sheet, not on the paper size alone. Count each wall as sheets across × rows, then add the walls together. A 305 × 254 mm wall takes four A4 sheets or two A3 sheets of our Provence Blue Flower wallpaper at 1:12.
Should I subtract doors and windows?
Usually not. Paper is hung over an opening and cut out afterwards, so the sheets still have to span it. Only an opening wide enough to replace a whole column of sheets changes the count; then measure the papered parts on each side as separate walls.
How much spare paper should I print?
At least one sheet per room, from the same file, paper and printer settings, for a mistaken cut or a later repair. The calculator can add one sheet or a percentage.