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What is Wallsizer?
A wallpaper calculator that computes the way a careful installer does: strip by strip, with the pattern repeat, the doors, the windows and the slope of the wall. You draw the room, pick the covering, and it returns the exact rolls or murals to order plus a numbered cut sheet.
Who is it for?
Wallpaper shops that quote from client measurements, interior designers who spec wallcoverings, and installers who want the math done before the ladder is out.
Do I need to install anything?
No. Wallsizer runs in the browser at app.wallsizer.com, on your phone, tablet and computer. Nothing to download, nothing to update.
How do I log in?
With a magic link: enter your email and click the link we send you. There is no password to remember or leak.
I did not receive the login email.
Check spam or junk first, and mark the message as safe so the next one lands in your inbox. Still nothing after a few minutes: write to hello@wallsizer.com and we will sort it out.
Is there a free trial?
Yes: 30 days with full access, cancel anytime. A card is required to start, and you are not charged during the 30 days.
Does it work on the phone, on site?
Yes. The app is built for the phone too: enter walls with one hand, the drawing and totals update live, and everything autosaves as you type.
How long does one room take?
About two minutes to enter a full room: walls, doors, windows and the covering. The cut sheet it returns saves the hour with the calculator and the pencil.
Measuring and the math
How accurate is it?
Quantities are computed per strip from your wall geometry, pattern repeat and match type: the same arithmetic a careful installer does by hand, done in seconds. Always verify measurements on site before ordering; that rule is printed on every export.
Do I subtract windows and doors from my measurements?
No. Enter the true wall sizes and add each opening with its position. Openings interact with strips and repeats in ways a mental discount cannot capture; the calculation removes exactly what can be removed, strip by strip.
What do I do with the skirting board or wainscoting?
There is a field for it: enter the height from the floor up to where the covering will stop. The wall height stays floor to ceiling, so window sills keep one zero line. Left at 0, the order simply runs a little generous, never short.
Can it do sloped walls, gables and attic rooms?
Yes. Switch Sloped walls on and give each wall a left and right height. For a peaked wall, split it into two walls at the ridge; for an attic wall that runs level and then slopes, split it where the slope begins. Strips flow across the split as if it were one wall, so the count stays exact.
The wall is 300 cm in one corner and 302 in the other. Which one do I enter?
The larger one. A covering that runs a touch long is trimmed on site in seconds; one that runs short is a reorder.
Is a chimney breast one wall or three?
Three: the front face and the two returns, each measured as its own flat wall. The same goes for alcoves.
What about radiators, sockets and light switches?
Ignore them. They are not openings; the covering runs behind or is cut around them during installation.
What units can I use?
Centimeters, inches, or feet and inches, switchable any time. In ft-in mode type 9'6 1/2 for 9 feet 6 and a half inches; fractions display to the sixteenth.
Can my client do the measuring for me?
Yes, with a measure link on the Team plan: the client measures the room on their phone and the project lands in your account. See the Measure links section below.
Clients measure, you quote
What is a measure link?
A link you send your client from the app, on the Team plan. They open it on their phone, walk the room with a tape measure and type in the walls, doors and windows on a simple measuring page. When they hit Send measurements, the project appears in your account with the geometry filled in, ready for you to pick the covering and quote.
What does my client see when they open the link?
Only the measuring page: walls, openings and a live drawing of what they enter. No prices, no projects, no account, nothing of yours.
When does the measured project show up in my account?
The moment your client taps Send measurements. Until then the link is theirs to finish; you will not see half-typed rooms.
Does my client need an account or the app?
No. The link opens in their phone browser and works on its own. They never sign in and never see the paid app.
Can I cancel a link I already sent?
Yes. Links can be revoked from the app at any time, and every link expires on its own after 7 days. A dead link shows the client a polite message and sends nothing.
Should I still verify the client's numbers?
Yes, before ordering, like any measurement you did not take yourself. The export says so on every page. The link saves the back and forth, not the site check.
Rolls, repeats and waste
Why not just divide the wall area by the roll area?
Because walls are covered in strips, not in square feet. Real strips are cut on whole repeats, corners and openings interrupt them, and every cut carries an overage. Area calculators divide and hope; Wallsizer counts the strips one by one.
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.
The supplier's calculator says fewer rolls. Who is right?
Open the cut sheet and count with it: every strip is listed with its length and the roll it comes from. Most quick calculators divide area and ignore the repeat, and the price of one roll too few is a reprint in a different dye lot. Wallsizer orders what actually survives the install.
What is a dye lot and why does everyone warn about it?
Rolls are printed in batches, and color can shift slightly between batches. Order too little and the extra roll you buy later may not match the wall. That is why getting the count right the first time matters more than saving one roll.
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 does the match type mean on the label?
Labels write it as two numbers, like 64/32 or 64/16. Free means no alignment between strips. Straight means the motif sits at the same height on every strip. Drop means every second strip shifts down half a repeat. Quarter drop means each strip steps down a quarter of a repeat and the motif realigns on the fourth. Wallsizer speaks all four and charges an extra repeat only when the shift truly does not fit.
Where should the last seam land?
Wherever the eye will not look for it: above a door or in a dark corner. In Roll, Pattern and Plain hung vertically, switch Start point on and pick the wall and the 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, so the one seam that cannot match stays where you chose it. The cut sheet counts from the start, the specs name the spot, and the installer note walks the route wall by wall.
What does "Saved by openings" mean?
The material the optimizer recovered from doors and windows: strips that land fully on an opening are cut as short pieces, and short pieces are cut from leftovers of earlier rolls. You see the saving in rolls or cuts.
A strip crosses a window. How is it cut?
As two pieces that install separately: one above the window, one below the sill. The cut sheet lists them as two rows, like 4a and 4b, both coming from the same roll and the same continuous cut, so the upper and lower half keep the same batch and the same pattern run. The layout page marks the two cut edges on the drawing, and the first page carries a note for the installer.
Can I run the material sideways (railroad)?
Yes. In Plain, set Hanging to Railroad: the material runs in level bands, one wall at a time, from the ceiling down. It is the standard way to hang liner for cross-lining, and the way 54 in vinyl loses its seams when the wall height fits inside the width. The cut sheet lists the bands top down, wall by wall, and Top and Bottom overage become the end allowances of every band.
Does it handle grasscloth and other naturals?
Yes. In Plain, set Material to Naturals: the order locks to full surface and the pieces hang in roll sequence, with that instruction printed in the installer notes. Shaded goods do not forgive pieces taken from another part of the roll, so the opening optimizer stays off. The summary shows the exact length and, next to it, the whole yards to actually order.
Does it handle untrimmed commercial material?
Yes. Enter the selvedge loss per edge in Side trim and the usable width adjusts; enter the manufacturer's overlap if the install is overlap and double-cut. Plain mode counts no-repeat goods by the linear yard.
Do I need lining paper first, and does Wallsizer count it?
Lining first is best practice on bare or patchy walls, and standard in the UK. Switch Lining layer on in the Project box of the Walls tab and enter the lining roll size. Wallsizer plans the lining across the finish layer, so the joints of the two layers can never line up, counts the rolls with real cuts (a piece never spans two rolls), and adds a Lining plan page to the export. The finish quantities never change.
Murals and custom prints
Custom mural: what size do I order?
Enter the mural slightly larger than the wall surface, then position it with the left and top margins; the right and bottom compute themselves. Coverage OK means it fits with your margins; SHORT in red tells you the largest margin that still fits.
My manufacturer sells murals in one fixed size.
Use Mural Standard: Wallsizer tiles whole murals side by side across the room, shows every joint, and tells you how many murals and panels to order. The panel layout page in the PDF numbers every panel in hanging order and labels which mural each one comes from: M2/6 means mural 2, panel 6.
I print wallpaper on demand. Which mode?
Pattern. Enter the printed strip width and the vertical repeat of the tile: strips are printed at the exact length needed, you order square footage instead of fixed rolls, and the export includes the grouped print list for the printer.
Does uploading my 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.
Exports and branding
What does the client actually receive?
A PDF with the drawing, the specs, the numbered cut sheet and the layout page, or a single clean JPG for a quick reply. Every export carries the project name, the date and the reminder to verify measurements on site.
Can I put my business name and logo on it?
Yes. Add them once in the Export menu and every export carries your branding. Your numbers, on your paper.
Do exports mention Wallsizer?
On Solo, a discreet Made with Wallsizer line sits at the edge of each page, under your branding. On Team, exports are white-label: your branding only, no Wallsizer mention anywhere.
What is the cut sheet?
The installer's script: every strip numbered in hanging order, left to right, with the roll it comes from and the order to cut it. The drawing, the totals and the cut sheet always agree.
What is the layout page?
The room drawing with a numbered box for every strip: hanging order and roll assignment along the ceiling line, plus the cut edges where a strip splits at a window. Murals get their own version: one box per panel, labeled with the mural it comes from (M2/6 = mural 2, panel 6), and skipped on panels that fall entirely on an opening that reaches the ceiling. It is the page the installer tapes to the wall.
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.
Devices and sync
Do projects sync between my phone and my computer?
Yes, on every plan. Projects autosave on your device and sync to your account, so you can start a room on your phone at the site and finish it on the desktop at the shop. The project list is the same everywhere you sign in. In a hurry? Tap Synced in the bottom corner and the app checks for changes right away.
Can I use Wallsizer on my phone and my computer at the same time?
Yes. Your 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.
I was signed out unexpectedly. Why?
Usually the two-device rule above: your account was just signed in somewhere else, and this device was the one used least recently. Sign back in with a magic link; your projects are exactly where you left them.
Does it work offline?
Opening the app and signing in need a connection. Once you are in, edits save on the device as you type; if the connection drops, the app says so and syncs your changes when it returns.
What if I clear my browser data?
Your projects are in your account: sign back in and they download again, together with the design copies stored with them. Only the original print files are untouched: they never leave your computer in the first place, so they stay wherever you keep them.
I deleted a project on my phone, but it is still on my desktop.
Give the desktop a moment: deleting a project removes it from your account and from all your devices at the next sync. If it still sits there after a refresh, write to us.
A project reappeared with (restored) in its name. What is that?
Someone deleted that project while one of your devices still held work done after the deletion. Rather than throw that work away, Wallsizer keeps it as a new project, marks it (restored) and tells you. Keep it if the work matters, delete it if it does not.
Working as a team
What does the Team plan include?
Everything in Solo, for the whole shop: 3 users, shared projects, measure links and white-label exports. One subscription, one account, three people working from it.
How do team members sign in?
You invite them by email from the account menu; each member signs in with their own address and magic link. No shared passwords. Removing a member cuts their access immediately.
Do we all see the same projects?
Yes. Projects belong to the account, not to the person: a colleague opens the same list, sees your edits, and their edits sync back to you. Uploaded designs travel with the project too, so the mural your colleague placed looks the same on your screen and in your exports.
What do the red and green presence dots mean?
That is presence, on the Team plan. Red, pulsing, with a name (say, Bio · 2m): that teammate saved a change here in the last few minutes, so wait or pick another project. Green and steady, no name: nobody else has touched this project recently, so it is safe to edit. The signal follows saved work, not open tabs: a colleague who has the project open but has not typed anything yet will not show up, which is why the dot is a courtesy, not a lock. It fades a few minutes after the person stops working. In the project menu, who and how recently shows right under the project's name, so you know before opening. The chip sits at the right end of the tab bar (phones show just the dot; tap it for the name). Set each person's name on the Team page; without one, the email prefix is shown.
Two of us edited the same project. What happens?
Best practice is one person in a project at a time, and the presence dot shows you exactly that before you start. If it does happen, nothing is lost: changes merge field by field, the last save wins on a field you both touched, and the app says "Updated by ..." with the teammate's name when their change lands. For a real clash, a banner names who and lets you load their version or keep yours. No silent overwrites.
Who owns the account and the billing?
The account owner: they hold the subscription, invite and remove members, and the projects belong to the account. Members work with the full app, minus billing.
Account and billing
How much does it cost?
Solo is $12 per month for the first 100 founding customers, then $19 per month. Team is $39 per month for the first 50 founding teams, then $49 per month. Founding prices stay locked for as long as your subscription stays active. Every plan: all modes, unlimited projects.
How does the free trial work?
30 days, full access, on either plan. A card is required to start and nothing is charged until the trial ends; cancel before that and you pay nothing at all.
How do I cancel?
In the app: the account menu, then Manage subscription, then cancel in the billing portal. One click, no emails, no retention scripts. You keep access until the end of the period you paid for.
What happens to my projects if I cancel?
They are yours. The projects stay in your account and on your devices, and your exported PDFs keep working forever. Subscribe again and the app opens right where you left it.
Do you store my card?
No. Payments run through Stripe; Wallsizer never sees or stores your card details.
Can I get invoices for accounting?
Yes: the billing portal under Manage subscription lists every invoice, ready to download.
Can I switch between Solo and Team?
Yes, from inside the app: open the account menu, go to Subscription, and use Change plan. Your projects come along untouched.
Moving up to Team takes effect right away, and we charge only the difference for the days left in the current period, never a full extra month. Moving down to Solo takes effect on your renewal date: you keep Team until then, nothing is charged and nothing is refunded, and your team members keep working until that date. You can call the change off any time before it happens. Any discount on your account stays on either way.
Only the account owner sees Change plan, because only they are billed. If you are a team member, ask them.
Your data
Where does my data live?
On your devices and in your account. Projects autosave locally and sync to your account over an encrypted connection, so every device you sign in on sees the same list. Wallsizer's servers store your projects to sync them and check your subscription, nothing more; your data is never sold or shared.
What about the design images I upload?
A reduced copy is stored with the project, so every device you sign in on, and on Team every teammate, sees the same design. The print file itself never leaves your computer.
What happens when I delete a project?
It disappears from your account and from all your devices, and any design images stored for it are deleted from our servers. Exported PDFs you already sent are files of your own and stay with you.
What about the data my client types into a measure link?
It goes straight into the project it was requested for, in your account, and nowhere else. The link stops working once it is used, revoked or expired.
Is my client's information safe?
Yes. Project data lives in your private account, is transmitted encrypted, and is used for exactly one thing: showing you your own projects. Screenshots you attach to a support message travel by email to our support inbox and are not stored on our servers.
When something is off
How do I get help?
From the app: the account menu, then Contact support; your message reaches a human and you can attach up to 2 screenshots. Or write directly to hello@wallsizer.com. We usually reply within one business day.
I think I found a bug.
Tell us what you did and what you expected, and attach a screenshot if you can. Bugs get fixed fast here; the changelog is long and honest.
Where do I learn the details of each mode?
The Handbook covers every mode field by field, and How to measure walks the tape-measure part step by step. Both are free, no login needed.