Borders
Wallpaper Border Calculator: Border-Only and Border-Plus-Wall Jobs
A wallpaper border is sold by length, not by the 53cm-wide roll a wall calculator assumes — so the usual "room area ÷ roll coverage" formula has nothing to work with. Borders show up in two common jobs: a border-only strip running around a room near the ceiling or a dado rail, and a border paired with full wallpaper below it. Here's how to calculate the length you need for either without the area-based math that doesn't apply.
Open the Wallpaper PlannerBorders are priced by length, not area
Measure the run the border will actually follow as a simple perimeter in metres — around the room at ceiling height, along a dado rail, or around a single feature wall — not as a square-metre area. Add up each wall's length along that run the same way you'd measure a skirting board, since that's the closer comparison, not a wallpaper roll.
Add extra for every internal and external corner
A border that turns a corner needs a mitred cut at that point, and each mitre uses up a small amount of extra length that a straight run doesn't. A simple rectangular room has four corners and barely notices this; a room with an alcove, a bay window, or several doorways has many more, and that per-corner allowance adds up across a job with a lot of turns.
A border above a dado rail changes where the full wallpaper below it ends
On a job pairing a border with full-height wallpaper, the border usually sits at or just above the dado rail line, which means the full wallpaper below only needs to run to the rail, not the full wall height — measure the two separately: the border as a linear length along the rail, the wall below as a normal strip-based estimate down to the skirting.
Pattern repeat still applies, just along the length instead of the height
Many printed borders have their own repeat distance along their length, the same idea as a full roll's vertical repeat but running horizontally instead — skip it and the border can run out mid-wall or land the design awkwardly at a corner. Check the label or spec sheet for a repeat figure the same way you would for a full roll, and add the same kind of allowance.
Order a buffer length, not a buffer roll
Because a border isn't sold in fixed 53cm-wide units, the usual advice to "order one extra roll" doesn't map directly — instead add a percentage, commonly around 10%, onto your total linear length to cover mitred corners, the repeat allowance, and any miscuts, then round up to the nearest length the supplier actually sells.
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See plans & pricingCommon questions
Is a wallpaper border calculated the same way as a full wall?
No — a full wall is estimated in strips cut to the wall height; a border is a simple linear length around the run it follows, with an allowance added for corners and repeat rather than the strip-and-roll math a full wall uses.
Can I use a border with full-height wallpaper below it?
Yes — that's the classic dado-rail pairing. Measure the two separately: the border as a linear length along the rail, and the wallpaper below it as a normal strip-based estimate to the rail height rather than the full wall.
Does pattern repeat matter for a border the same way it does for a full roll?
Yes, in the same way but along the length instead of the height — check the label for a repeat distance and add an allowance for it, the same rule that applies to a full patterned roll, or the design can land awkwardly at a corner or seam.
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