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Masking and Protection Materials Calculator

Dust sheets, masking tape and floor protection for a room — counted from the edges and the floor, because tape follows lines and sheeting follows area.

  • Answers as you type
  • Every formula cited
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SettingsSettings for this calculationUS
Market
Imperial · sales tax
The floor being covered.

Cover the whole floor, not the part under the ladder. Most of the mess on a decorating job is walked around rather than dropped, and a part-covered floor is a floor that gets paint on it.

Once around the room at floor level.

A 4 × 3 m room is 14 m. This is the figure that decides the tape, and it is why area is the wrong basis: a 6 × 2 m room has the same 12 m² of floor and 16 m of perimeter, so it wants more tape for the same paint.

How many times the tape goes round — skirting, ceiling line, a picture rail.

Two is usual: once along the top of the skirting and once at the ceiling line. Put one where the ceiling is being painted in the same colour and needs no line, and three where a picture rail or a dado adds another. Cutting in by hand instead of taping is a legitimate answer to this field: put zero.

Each frame is masked all the way round.

Count doors, windows and any other opening with a frame. Each is a fixed amount of work regardless of the room's size, which is why they are counted as items rather than folded into the perimeter.

Once around one frame — both jambs and the head.

A 2 m × 0.8 m door frame is two jambs and a head, about 4.8 m, and a window with a sill and a reveal is similar once the glass line is included. Raise it where the glazing itself is being masked, which on a multi-pane sash can be several times the frame.

The area one sheet usefully covers once it is overlapped.

Sheets overlap in use, so the useful coverage is less than the nominal size — the default here is already a little under the 9.7 m² a 3.6 × 2.7 m sheet measures. Rolls of self-adhesive carpet film and corrugated board are sold by length instead; enter the area one roll actually covers.

As sold. Check the roll rather than assuming.

Low-tack tape for fresh paint and delicate surfaces often comes in shorter rolls than general-purpose tape, so check the roll rather than assuming. Tape also has a shelf life: an old roll tears and leaves adhesive, which costs more time than a new roll costs money.

Protection materials

3 items

Medium confidence

2 sheet(s) and 1 roll(s). Openings are 35% of the tape here — they do not scale with the room, so a small room full of frames takes more than a big empty one.

Dust sheets
2 sheets
Tape rolls
1 roll
Tape along the room
92 ft
Tape around openings
49.5 ft
Tape in total
141.5 ft
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Floor protection is an area: the floor divided by one sheet's coverage, rounded up to whole sheets
  • Masking tape follows edges rather than area — the perimeter lines being cut in, plus a length for each door and window frame, which does not scale with the room
  • Tape is sold in rolls of a stated length, so the order is the total edge divided by the roll length, rounded up

Inputs used

Floor area
130 sq ft
Room perimeter
46 ft
Taped lines around the room
2
Doors and windows
3
Tape per opening
16.5 ft
One dust sheet covers
120 sq ft
Tape roll length
180 ft

Intermediate steps

Dust sheets
2 sheets
Tape rolls
1 roll
Tape along the room
92 ft
Tape around openings
49.5 ft
Tape in total
141.5 ft
Final result3 items

Confidence note: 2 sheet(s) and 1 roll(s). Openings are 35% of the tape here — they do not scale with the room, so a small room full of frames takes more than a big empty one.

What this calculation does not cover

  • Tape follows edges and sheeting follows area, so the two answers move independently. A long narrow room and a square one of the same floor area take the same sheets and noticeably different tape.
  • Nothing here covers what the room holds. Furniture that cannot be removed needs its own sheeting, and a fitted kitchen or a bathroom suite is masked item by item — neither is a function of the floor.
  • Dust sheets are reused and tape is not. A decorator already owning sheets needs none of the first figure and all of the second, which is why they are reported separately rather than as a single kit.
  • Tape type is not a quantity question and matters more than the quantity. General-purpose tape lifts fresh emulsion and can pull paper from plasterboard; low-tack or delicate-surface tape exists for that, and any tape left on through sunlight becomes far harder to remove.
  • Floor protection for trades other than decorating is a different product. Corrugated board, hardboard and heavy-duty film protect against impact and traffic; a cotton dust sheet protects against drips and nothing else.
180 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Part of bigger jobs

This trade is one line of several job takeoffs. Run the whole job and every other trade comes back with it, off the same measurements.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-23 · v1.0.0

Regulatory standards & verification citations3
  1. Floor protection is an area: the floor divided by one sheet's coverage, rounded up to whole sheets
  2. Masking tape follows edges rather than area — the perimeter lines being cut in, plus a length for each door and window frame, which does not scale with the room
  3. Tape is sold in rolls of a stated length, so the order is the total edge divided by the roll length, rounded up
Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Tools and safety for this job

To protect retained finishes. Generic types, no brands, no prices.

Protection this work requires

  • Knives cause more site injuries than any power tool: cut away from your body, change blades often, and wear cut-resistant gloves to EN 388 level C for repeated cutting.
  • Loose sheeting, trailing leads and offcuts turn every trip across a room into a fall: tape protection down at every edge, run leads along the walls, and keep the way in clear of waste.
Show the 3 tools this job needs

Essential

  • Dust sheets and masking

  • Utility knife

Recommended

  • Tape measure

Also needed as materials: masking tape, plastic sheeting, replacement blades.

what each site-management tool is for, and the spec that decides which to buy where one does.

Worked examples: A room replastered — step 1 of 6 · Bedroom repaint — step 1 of 7

The data behind it: Production rates by operation

How to calculate masking and protection materials in 8 steps

  1. Floor areaThe floor being covered.
  2. Room perimeterOnce around the room at floor level.
  3. Taped lines around the roomHow many times the tape goes round — skirting, ceiling line, a picture rail.
  4. Doors and windowsEach frame is masked all the way round.
  5. Tape per openingOnce around one frame — both jambs and the head.
  6. One dust sheet coversThe area one sheet usefully covers once it is overlapped.
  7. Tape roll lengthAs sold. Check the roll rather than assuming.
  8. Protection materialsThe tool computes the protection materials from those figures and shows the formula, its sources, and a confidence rating alongside it.

Protection materials by floor area

Page defaults, not your figures above.

Floor areaProtection materials (items)
100 sq ft2
150 sq ft3
200 sq ft3
250 sq ft4

Frequently asked questions

How much masking tape do I need for a room?
Count edges, not area: the page's 4 × 3 m room, taped at the skirting and the ceiling line with three openings, takes roughly 43 m (141 ft). That is 14 m of perimeter twice over — 28 m — plus about 5 m around each door and window, comfortably inside one 50 m roll.
How many dust sheets for a room?
Divide the floor by what one sheet usefully covers: a 12 m² (130 sq ft) room, the page's default, takes two. A 3.6 × 2.7 m cotton twill sheet measures 9.7 m² and covers a little less once it is overlapped and turned up at the skirting, which is why that room needs two. Sheets are reusable, so this is a figure you buy once and a tape figure you buy every job.
Why does the room's shape change the tape but not the sheets?
Because they follow different things. Sheeting follows the floor, and two rooms of 12 m² take the same sheets whatever their shape. Tape follows the perimeter, and a 6 × 2 m room has 16 m of it against a 4 × 3 m room's 14 — the same floor, more edge. Openings widen the gap further, since each frame is a fixed length that has nothing to do with the room at all.
Is it quicker to tape or to cut in by hand?
That is a decision this page deliberately leaves to you, which is what the taped-lines field is for. Set it to zero and the tape figure falls to the openings alone. Taping pays on a long straight run against a hard edge and on anything a brush cannot be steady against; a practised hand cutting in at a ceiling line is usually faster than masking it, and never leaves a tape line to touch up.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.