WALLSIZER
Handbook

Draw the walls.
Read the order.

Wallsizer computes wallcovering quantities the way a careful installer does: strip by strip, with the pattern repeat, the doors, the windows and the slope of the wall. Everything updates live, and every number on screen matches the drawing and the export.

01 · Start here
1

Draw the room

In Walls: widths, heights, doors and windows. Walls unfold left to right.

2

Pick the covering

Wallpaper (Roll, Pattern, Plain) or Mural (Custom, Standard). Each runs its own math.

3

Read the summary

Rolls, strips or murals to order, waste, savings. It updates as you type.

4

Export

PDF for the installer and the client, JPG for a quick send. Add your business name and logo once, in the Export menu: every export carries your branding. Your numbers, on your paper.

Good to know

UnitsToggle cm / in / ft-in any time, top right. Values convert instantly. In ft-in, type 9'6 1/2 for 9 feet 6 and a half inches. A plain number means inches, and fractions alone work too: 6 1/2.
AutosaveEvery change is saved on this device automatically and synced to your account: start on your phone, continue on your desktop. On the Team plan the whole team sees the same projects.
ProjectsThe ▾ next to the project name lists your projects: switch, add new, duplicate, delete. Rename by typing over the name.
UndoThe ↺ ↻ arrows, or Cmd/Ctrl+Z. Tab moves you through the fields.
02 · Step 1

Walls

Enter each wall's width and height. Walls sit side by side, left to right, exactly like walking around the room. Wallpaper flows over the corners, so the order of walls matters.

OpeningsAdd a door, window or niche on its wall. From left is measured from that wall's left corner. Sill is the height of the bottom edge from the floor (doors sit at 0). Rename labels freely: they carry into the export.
Wainscoting / skirtingMeasure from the floor up to where the covering will stop: just a skirting board (baseboard), enter its height; paneled wainscoting, enter floor to the top of the rail. 0 means the covering runs to the floor. The wall height stays floor to ceiling either way, so window sills keep one zero line. Openings fully inside this band are ignored automatically. Left at 0, the order simply runs a little generous, never short.
Batch / dye lotOptional. Write the lot number from the label and it prints in the specs of every export, next to the reminder to order the full quantity from a single lot.
Sloped wallsSwitch Sloped walls on in the Project box at the top of the Walls tab, then give each wall a left and right height. For a peaked (gable) wall, split it into two walls at the ridge. For an attic (mansard) wall that runs level and then slopes, split it where the slope begins: one level wall, one sloped wall. Strips flow across the split as if it were one wall, so the count stays exact. Strips are cut to the tallest point they cover and the diagonal is trimmed on site. On sloped walls the cut sheet adds an Above wall L column: how far each strip's top sits above the ceiling line at its left edge, overage included, so the strip can be positioned before the rake (the sloped top edge) is trimmed.
Lining layerSwitch Lining layer on in the Project box when the walls get lining paper before the finish covering, and enter the lining roll width and length. The lining always runs across the finish layer (cross-lining), so the joints of the two layers can never line up: level bands under vertical strips and murals, plumb strips under railroaded material. The covering tab shows the lining rolls to order under the main order, counted with real cuts (a piece never spans two rolls), and the export gains a Lining plan page with the cut list, wall by wall. The lining never changes the finish quantities.

If an opening pokes outside its wall, Wallsizer outlines it in red and flags it, so a typo never hides in the order.

03 · Wallpaper

Roll

Classic wallpaper sold in fixed rolls. Copy the numbers from the manufacturer label: roll width, roll length, pattern repeat. Wallsizer unrolls your rolls one after another, cuts every strip on a whole repeat, and tells you exactly how many rolls to order and how to cut them.

Pattern match, straight from the label

Labels write the match as two numbers, like 64/32 or 64/16. Wallsizer speaks all four match types:

Free Straight Drop Quarter drop

Free (label: 0, "Random match"). No alignment between strips. Each strip is cut at wall height plus overages. The least waste. Typical for solids, textures, plain vinyls.

Straight (label: 64/0). The motif sits at the same height on every strip. Cuts are rounded up to whole repeats, and that rounding is your alignment allowance.

Drop (label: 64/32, "Half-drop"). Every second strip shifts down by half a repeat, so the motif flows diagonally. Wallsizer fits the shift inside the normal rounding when it can, and only charges an extra repeat when it truly does not fit.

Quarter drop (label: 64/16, "Multiple drop"). Each strip steps down a quarter of a repeat and the motif realigns on every fourth strip, a long slow diagonal. Wallsizer fits each step inside the normal rounding when it can, exactly like Drop.

STRAIGHT DROP
Straight: motif level across strips · Drop: every second strip down half a repeat

The fields, in plain words

Side trimSome materials ship untrimmed: a selvedge edge with printer marks on each side, cut off during install. Enter the loss per edge; usable width becomes roll width minus twice the trim. Normal pre-trimmed rolls: leave 0.
Top / bottom overageExtra length at the top and bottom of every strip, trimmed on site. Standard practice is about 2 in per end.
OverlapMost modern wallpaper is butt-seamed (edges meet, nothing overlaps): leave 0. Some commercial installs overlap the strips and double-cut through both layers for a perfect seam; enter the manufacturer's overlap and the strip count adjusts.
Left offsetSlides the design and all seams to the left. Use it to keep a seam off a corner or an opening. The PDF then tells the installer exactly how much to cut off strip 1. With Start point on, the field locks and reads at start point: strip 1 always hangs whole there, and you move the design by moving the start point.
Start pointThe same control the murals have. Pick a wall and a distance from its left corner: strip 1 hangs full on a plumb line there, the run wraps the room, and the last strip is cut where it meets strip 1. The one seam that cannot match lands exactly where you chose it, above a door or in a corner nobody studies. The cut sheet counts from the start, and the installer note walks the route wall by wall.
Design previewOptional, in every mode: upload the artwork and the drawing shows the real design on the walls, with an opacity slider underneath. JPG, PNG or WebP, a few MB is plenty. The best file is a reduced copy of the print file itself, because it keeps the true proportions: the whole roll in Roll, the tile in Pattern, the mural at its size in Mural. Wallsizer compares those proportions with the sizes you typed and shows a small warning under Design when they disagree. The preview is visual only: quantities never depend on the image.
OpeningsOptimized: a strip that lands fully on a door or window is cut as short pieces on whole repeats, and short pieces are cut from leftovers of earlier rolls. Full surface: every strip stays full length, maximum safety margin.

Reading the summary

Rolls to orderPhysical rolls, consumed in order. If you entered a double-roll length, the count is double rolls.
WasteHow much of the purchased rolls does not end up on the wall, leftovers included. Some waste is normal: repeats force every cut up to a whole motif, and the leftover of the last roll counts too.
Saved by openingsWhat the optimizer recovered from doors and windows, in rolls or cuts.
Gross area · To coverPure geometry: the gross surface — walls with their windows, doors and openings still in — minus those openings, equals the surface actually covered. Independent of any toggle.

The cut sheet in the PDF numbers every strip in hanging order, left to right, and marks which roll it comes from and in what order to cut it. A strip that crosses a window appears as two rows, like 4a and 4b: one piece above the window, one below the sill, both cut from the same continuous length of the same roll, so the halves keep the same batch and the same pattern run. The layout page marks the two cut edges on the drawing, and page 1 carries a note for the installer. The drawing, the numbers and the cut sheet always agree.

04 · Wallpaper

Pattern

Custom-printed wallpaper, made to order. Enter the printed strip width and the vertical repeat of the design tile. Strips are printed at the exact length needed, so you order square footage instead of fixed rolls, and doors and windows save print.

Pattern widthThe width of one printed strip.
Pattern heightThe vertical repeat of the tile. Pieces align on this grid; a half-drop layout lives in the artwork itself.
Print areaWhat you order from the printer: cut lengths times strip width, overages included. Shown next to the wall surface so both numbers are in view.
Start pointShared with Roll: one start point drives both. Strip 1 starts full on your plumb line, the install sheet counts from there, and the closing cut lands in the last strip.

The PDF includes the Install sheet (hanging order: the strips arrive pre-cut) and the Print list, the grouped order for the printer: so many full strips at this length, plus the short pieces, each with its length.

05 · Wallpaper

Plain

No-repeat materials: commercial vinyl, grasscloth, textures, liner. There is no motif to match, so strips are cut at exact length and the commercial unit is the linear yard.

Material widthThe width of the goods, for example 54 in commercial vinyl.
HangingVertical is the classic install: strips flow over the corners on one continuous grid, with the same Start point control as Roll and Pattern. Railroad runs the material in horizontal bands, one wall at a time, from the ceiling down: the standard way to hang liner (cross-lining), and the way 54 in vinyl loses its seams when the wall height fits inside the width. Top and Bottom overage become the end allowances of every band.
MaterialVinyl / textures keeps the opening optimizer available. Naturals (grasscloth, silks) locks the order to full surface and adds the sequence note to the export: shaded goods do not forgive pieces taken from another part of the roll.
Linear to orderThe total length to buy, in linear yards (or meters), with the number to actually order next to it: whole yards, rounded up.
OpeningsWith Optimized on, both doors and windows save material, because there is no pattern continuity to protect. On Full surface, every strip stays full.
SwatchOptional texture image, for visualization only. Quantities never depend on it.
06 · Mural

Mural · Custom

A mural printed exactly to your size. Enter the mural's total width and height, slightly larger than the wall surface, then position it with the left and top margins. The right and bottom margins compute themselves.

CoverageOK means the mural covers the surface with the margins you set. SHORT in red means it does not: the message tells you the maximum margin that still fits.
PanelsMurals ship in vertical panels. Enter panel width and overlap; Wallsizer shows the panel count and the width of the last panel, with a check mark when it fits exactly.
Trim on siteThe list under the summary: how much gets trimmed top and bottom, left and right, after positioning.
Start pointA mural that wraps the whole room closes back on itself, and the closing seam never matches the pattern. Switch Start point on, pick a wall and a distance from its left corner: the mural starts there, wraps the room, and the seam returns exactly where you chose it, above a door or in a corner nobody studies. The drawing marks the start with a solid line; the extra length is the closing allowance, and the last panel is simply cut where it meets the first.
07 · Mural

Mural · Standard

Some manufacturers sell murals in one fixed size. Wallsizer tiles whole murals side by side across the room: the design repeats at every joint, and you order whole murals.

M1 M2 M3 joints and trim edges dashed red · panel seams dashed black
Whole murals tiled left to right · the design repeats at every joint · excess trimmed on site
Standard mural sizeThe manufacturer's fixed width and height, from the product page.
Installation marginsLeft slides the design and the joints; Top chooses how much of the top is trimmed. Right and bottom compute themselves. The trim list shows all four allowances. With Start point on, Left locks and reads at start point: the murals start at the point, and you move the design by moving the point.
Murals to orderWhole murals, numbered M1, M2 ... on the drawing in hanging order, with panels per mural and the total panel count. Each mural carries its own color on the drawing, so you always know which piece belongs to which mural.
Start pointThe same idea as in Custom: switch Start point on, pick the wall and the distance, and the murals hang in order around the room from that point. Mural 1 starts at the solid line, the run wraps the room, and the last mural is trimmed where it meets mural 1. What remains of it is the closing allowance, shown in the summary and in the export, so the seam that never matches lands exactly where nobody will see it.

Installer: the left corner falls 140 cm into mural 1: skip panels 1-2, cut 16 cm from the left edge of panel 3, then start level.

When the wall corner falls inside the first mural, the PDF prints a red line like the one above: which panels to skip and where to cut, so the install starts right the first time.

08 · Finish

Exports

The Export button, top right. Every export carries your project name, the date, and the reminder to verify measurements on site.

PDFThe full document, page by page: the specification first, then the drawing, large on its own page, then the cut sheet (Roll, Plain) or install sheet (Pattern) with the installer notes, then the layout page: every strip's number and roll assignment, the START mark, and the cut edges where a strip splits at a window. Pattern adds the grouped print list on its own page. Murals get the plan page with specs, numbered installer steps and coverage cards, the drawing at full width, and a panel layout page: one box per panel with its hanging number, the mural it comes from (M2/6 = mural 2, panel 6) and the START bar when a start point is set. With the Lining layer on, every mode adds a Lining plan page: rolls to order and the band cut list, wall by wall.
JPGOne client-friendly image: the drawing with the key numbers under it. Perfect for a quick reply.
Your brandingAdd your business name and logo once, in the Export menu: every export carries them. On Solo, a small Made with Wallsizer line sits at the edge of each page; on Team, exports are white-label: your branding only, no Wallsizer mention.
10 · Account

Devices, sync & team

Sign inWith a magic link: enter your email, click the link we send. No password to remember or leak.
DevicesYour account works on any of your devices, with two signed in at the same time. Sign in on a third and the one you have not used for the longest is signed out on its own. Nothing is lost: projects live in your account, and signing back in takes one magic link.
SyncOn every plan: projects autosave on the device and sync to your account, so the phone at the site and the desktop at the shop see the same list. If the connection drops, edits are saved locally and sync when it returns. In a hurry? Tap Synced in the bottom corner and the app checks for changes right away instead of waiting for the next cycle.
PresenceOn the Team plan, a dot next to the project name shows who has been working in the project in the last few minutes. Red, pulsing, with a name: that teammate saved a change there, so wait or pick another project. Green and steady, no name: nobody else has touched it recently, so it is safe to edit. The signal follows saved work, not open tabs, so treat it as a courtesy rather than a lock. It fades a few minutes after the person stops. The project menu shows who and how recently under each project's name; the chip itself sits at the right end of the tab bar (phones show just the dot).
ConflictsIf a teammate saved the project you were editing, a banner names who and lets you Load theirs or Keep mine. No silent overwrites.
TeamOn the Team plan: account menu, then Team, invite up to 2 teammates by email. Each signs in with their own address and gets the full app on your subscription; projects and uploaded designs are shared. Removing a member cuts their access immediately. Give each person a name on the Team page: teammates see it in presence, in "Updated by" and in conflict banners.
DeletingDeleting a project removes it from your account and from all your devices at their next sync. If a device held work done after the deletion, that work is kept as a new project marked (restored) instead of being thrown away.
SupportAccount menu, then Contact support: your message reaches a human and you can attach up to 2 screenshots. Or write to hello@wallsizer.com.
11 · Questions

Straight answers

Why does Wallsizer ask for more than an area calculator?

Area calculators divide square footage and hope. Real strips are cut on whole repeats, corners and openings interrupt them, and every cut carries an overage. Wallsizer computes the strips one by one, so the number is the one that actually survives the install.

Single or double rolls?

US wallpaper is often priced per single roll but ships as double rolls. Wallsizer counts physical rolls at the length you enter: type the double-roll length and the count is double rolls.

What exactly is the waste percentage?

The share of the purchased material that does not end up on the wall: repeat rounding, overages, offcuts and roll leftovers, all included. It is measured against the rolls you buy, because that is what you pay for.

Does uploading a design change the quantities?

No. The design upload is visual: it fills the drawing so you can see seams and repeats on the actual artwork. Quantities come from the numbers, always.

What does the red Installer line mean?

It appears when the first strip, panel or mural overhangs the left corner because of an offset. It tells the installer exactly how much to cut from the first piece, so the whole room starts level and on plan.

Coverage says SHORT. Now what?

The mural does not reach the floor or the corner with the margins you set. The red message under the summary tells you the largest margin that still fits, or you can pick a larger mural size.

How do I type feet and inches?

In ft-in mode, type 9'6 1/2 for 9 feet 6 and a half inches. A plain number means inches, and a fraction alone works too. Wallsizer shows fractions to the sixteenth.

Where does my data live?

On your devices and in your account: projects autosave locally and sync to your account, so you can start a room on your phone and finish it on your desktop. A reduced copy of each design travels with the project, so your other devices, and on Team your teammates, see the same image.

Can my client measure the room themselves?

Yes, with a measure link on the Team plan: they measure on their phone, tap Send measurements, and the project appears in your account. The Measure links section above walks through it.

A door sits inside the wainscoting. Do I need to do anything?

No. Openings fully inside the wainscot are ignored automatically, because the covering never reaches them. Strips there stay full length and the cut sheet stays sequential.

Can Wallsizer do peaked (gable) walls?

Yes: switch Sloped walls on and split the peaked wall into two walls at the ridge, one rising, one falling. Strips are cut to the tallest point they cover and the pattern grid stays level.

Where should a wrap-around mural start and end?

Where the closing seam will be least visible: above a door, behind tall furniture, in the darkest corner. A mural that wraps the room always closes back on itself, and that last joint never matches the pattern. Switch Start point on in either Mural mode and choose the wall and the distance from its left corner; the export then tells the installer exactly where to hang the first panel and how much of the last one remains as closing allowance.

Can it do attic walls, level first and sloped after?

Yes, the same way: split the wall where the slope begins, one level wall and one sloped wall. Strips run on one continuous grid across the whole room, so the split changes nothing in the count. The drawing shows a joint line at the split; on site it is one surface. If a window sits across the split, enter it in two parts, one on each wall.

How do team accounts work?

On the Team plan, the account menu (the gear, top right) has a Team entry. Invite a teammate by email: they receive a sign-in link right away and get the full app under your subscription, with their own email. Your plan includes 3 users: you and 2 team members. Removing a member cuts their access immediately. Billing stays with the account owner only.

Can I remove the Made with Wallsizer line from exports?

Yes, on the Team plan. Team exports are white-label: they carry your business name and logo only. On Solo, the line stays as a small credit on each export; your own branding is always shown on every plan.