Every result should be inspectable.

Editorial standard

Primary sources come first: current product technical sheets, manufacturer measuring and installation guidance, standards bodies, and government safety material. Competitor tools are used to understand interaction patterns, not copied as universal authority.

Observed means directly stated in a linked source or found in the current product. Derived means arithmetic from user inputs. Inference means WallVive's explained planning choice. Forecast is a future expectation and is never presented as a measured outcome.

WallVive does not claim professional installation credentials, laboratory testing, first-hand product testing, customer projects, or universal compliance. Product labels, technical and safety data sheets, physical samples, qualified trades, and local rules control where applicable.

Paint takeoff method

Users choose one rectangular surface or a whole room, then enter any rectangular openings, coat count, selected-product coverage, one purchasable container size, an optional buffer, optional separate primer data, and an optional local container price.

Whole-room mode expands the entered floor plan into four rectangular walls — two of the room length and two of the room width, each at the entered wall height — plus the ceiling when it is included. The walls are summed, not averaged, so the gross figure equals perimeter × height. Alcoves, chimney breasts, bay returns, sloped or coved ceilings, and skirting deductions are not modelled; a room with those features should be measured as separate surfaces.

gross area = Σ(surface width × surface height)
room walls = 2 × (length × height) + 2 × (width × height)
room ceiling = length × width, when included
opening area = Σ(opening width × opening height × quantity)
net area = gross area − opening area
theoretical liquid = net area × coats × (1 + buffer %) ÷ product coverage
containers = ceil(theoretical liquid ÷ container size)
planning surplus = purchased liquid − theoretical liquid
subtotal = containers × price entered by user

Openings that leave no positive wall area are rejected, and so is any opening wider or taller than every measured wall (or than the ceiling either way round, when it is included), which catches a size entered in the wrong unit. Primer is a separate line with its own coverage, coats, container, and price. Mixed-container optimisation is deliberately excluded because the objective can be smallest surplus, lowest price, or fewest cans; a silent greedy choice can be wrong.

The interface begins with editable example coverage and coat values to demonstrate the tool. They are not universal claims. Replace them with the exact product label or technical sheet. Buffer begins at 0%.

Paint and safety sources

• Benjamin Moore Regal Select Flat N547 technical data sheet — product-specific spread rate, coats, surface dependency, revision 25 March 2025.
• Benjamin Moore paint calculator — rough-estimate framing and opening inputs.
• Sherwin-Williams paint calculator — product and surface variability.
• US EPA indoor-air guidance for remodelling.
• US EPA lead-safe DIY guidance — pre-1978 US housing warning.

Wallpaper takeoff method

The release supports one rectangular accent wall and free or straight matches. Users enter the wall and the usable roll length in feet or metres, and the usable roll width, straight repeat, and total top-and-bottom trim allowance in inches or centimetres, as roll labels print them. Those fine measurements are converted exactly (12 inches per foot, 100 centimetres per metre) before any drop is counted. An optional extra full-drop percentage and local roll price complete the inputs.

base drops = ceil(wall width ÷ usable roll width)
raw drop = wall height + total trim allowance
straight-match cut drop = repeat × ceil(raw drop ÷ repeat)
drops per roll = floor(usable roll length ÷ cut drop)
reserve drops = ceil(base drops × extra-drop %)
rolls = ceil((base drops + reserve drops) ÷ drops per roll)

Normal contained openings reduce the reported net area but do not reduce full-drop count automatically. Reuse depends on opening position and pattern match. A full-height excluded section can be modelled by reducing wall width.

Half-drop, offset, mural, reverse-hang, mixed-height walls, and nonstandard layouts need manufacturer-specific usable-drop data or a proved layout. The tool will not silently treat them as straight matches. Unused length is a fragmented total across physical rolls, not a guarantee of one reusable offcut.

Wallpaper and unit sources

• Graham & Brown wallpaper FAQ — free, straight, and offset match distinctions.
• Graham & Brown measuring guide — gross-wall planning and product checks.
• Graham & Brown batch-number guidance.
• Wallcoverings Association estimating guidance.
• NIST length units and NIST volume units — exact conversion factors.

Board and batten layout method

Users enter one rectangular wall, the actual face widths of the battens, top rail, and baseboard or bottom rail, the height of the top rail, any middle rails, and either a target clear gap or a fixed number of battens. Wall, board, gap, opening, and kerf sizes are in inches or centimetres; board stock lengths are in feet or metres and are converted exactly (12 inches per foot, 100 centimetres per metre) before planning.

with a batten at each corner:   n* = (wall + target gap) ÷ (batten + target gap)
without corner battens:         n* = (wall − target gap) ÷ (batten + target gap)
battens n = floor(n*) or ceil(n*), whichever gap is nearer the target
            (a tie takes the narrower gap), or ceil(n*) for "no wider than target"
gaps = n − 1 (corner battens) or n + 1 (no corner battens)
gap = (wall − n × batten) ÷ gaps
left edge of batten i = i × (batten + gap), plus one gap without corner battens
batten length = top rail underside − top of baseboard or bottom rail
middle rail panels = (batten length − rails × batten) ÷ (rails + 1)

Every position is computed from the left corner, not by adding rounded gaps, and only the display is rounded (to 1/16 inch or 1 millimetre). Doors and windows are rectangles measured to the outside of the casing: a batten that overlaps one is cut into the pieces above and below it, and a rail that crosses one is cut either side of it. The spacing itself stays even across the whole wall. Battens that straddle a casing edge and outlets behind any board are reported, not moved.

Pieces are planned per stock type. Battens and middle-rail blocks share the batten stock; top and bottom rails share the rail stock. A piece longer than the stock is split into full lengths plus a remainder and reported as needing a joint. Pieces are then packed first-fit decreasing, with one saw kerf charged per piece: n pieces fit a board when n × length + (n − 1) × kerf ≤ stock length. Spare boards are a user percentage of the planned boards, rounded up. First-fit decreasing always yields a cuttable plan but is not proven to be the minimum for every mix of lengths.

Board and batten sources

• American Softwood Lumber Standard PS 20-20 (NIST) — Table 3, nominal and minimum dressed board sizes (for example, a 1×4 is 3½ in, or 89 mm, wide when dry).
• NIST length units — exact inch, foot, and metre conversions.

Wainscoting (picture frame molding) layout method

The tool lays out one uninterrupted run, corner to corner or corner to a door casing, with an existing baseboard, an optional chair rail, a row of boxes below it, and an optional second row above it in the same columns. Users enter the end gap, the gap between boxes, the gap above and below the boxes, the molding face width, and either a target box width or a box count.

n* = (run − 2 × end gap + gap) ÷ (target width + gap)
boxes n = floor(n*) or ceil(n*), whichever width is nearer the target,
          reduced if the boxes could not hold the molding on both sides
box width = (run − 2 × end gap − (n − 1) × gap) ÷ n
lower box height = chair rail top − chair rail face − baseboard − 2 × vertical gap
upper box height = upper limit − chair rail top − 2 × vertical gap
inside opening = box size − 2 × molding width
molding per box = 2 × box width + 2 × box height (long-point lengths)

Box sizes are outside dimensions, which are the long-point lengths each 45° mitred piece is cut to. Pieces cut one after another from a stick nest long point to long point, so the triangular waste comes from the short edge and each piece costs its length plus a user cut allowance for the saw kerf. Pieces are packed onto the stick length first-fit decreasing, in the same way as the board and batten plan, and spare sticks are a user percentage rounded up. The chair rail is planned on its own stock.

Doors and windows are not modelled inside a run. Each stretch between casings is laid out on its own so its boxes stay equal; a window above the chair rail leaves the lower row alone but interrupts an upper row.

Units, rounding, and money

Conversions use exact factors where defined: 1 inch = 2.54 centimetres, 1 foot = 0.3048 metres, 1 square foot = 0.09290304 square metres, and 1 US gallon = 3.785411784 litres. The calculator keeps unrounded values through the calculation and rounds purchase quantities upward only where whole physical containers, rolls, boards, or sticks are required. Trim positions are shown to the nearest 1/16 inch or millimetre for marking out; the layout itself uses the unrounded values.

Measurement fields accept a decimal point or a decimal comma (12.5 or 12,5). On a keyboard with a slash, they also accept tape-measure fractions (3 1/2, 3-1/2, or 3½); phone number pads show only digits and a decimal mark. Anything other than a plain decimal is shown back under the field as the number used. A point is always the decimal mark, so 1.250 is 1.25. A comma between a number from 1 to 999 and exactly three more digits, as in 1,250 (1250 or 1.25), is flagged rather than guessed, and so is text that is not a number; flagged fields count as missing. Cut lists over 10,000 pieces are refused as a likely unit error.

Currency is a label, not an exchange-rate service. A monetary total appears only after a user enters the local per-container, per-roll, or per-board price. The subtotal excludes tax, delivery, tools, adhesive, preparation, substrate repair, removal, waste disposal, and labour unless the user accounts for those outside the current tool.

Images, concepts, and colour

Current room and material imagery is generated design imagery. It is labelled next to the image and must not be read as a completed project, client outcome, real installer work, measured budget, exact product, licensed brand colour, or performance evidence.

The palette explorer shows generic screen concepts. It does not upload a room, identify wall surfaces, simulate a brand catalogue, or predict an installed finish. Screens, photography, ambient light, sheen, substrate, and adjacent materials change perception. Check physical samples and product instructions.

Commercial relationships and update policy

As of this review, WallVive has no affiliate links, paid placements, sponsored product rankings, retailer price feed, or lead-sale form. If that changes, the relationship must be disclosed beside the affected content and in this policy.

Material calculation code is covered by table-driven regression tests. Materially changed calculator logic, source decisions, and correction records are dated. Thin page scaling is not a substitute for better calculations or source maintenance.