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Baseboard & Trim Calculator

Estimate the linear feet or metres of baseboard trim needed and how many stock lengths to buy.

Baseboard is skirting board in the UK and Australia.

  • Answers as you type
  • Every formula cited
  • Calculated in your browser
SettingsSettings for this calculationUS
Market
Imperial · sales tax
Who is doing the work?

The standard allowance most suppliers and estimating guides assume for ordinary work.

A rectangle's two sides, or the run of wall you measured round an L-shape, a bay or an alcove.

Skirting follows the foot of every wall, so a room that is not four straight walls is easiest measured wall by wall along the floor and added up; enter that total as the perimeter. Doorways come off either way.

The length of the room.

Measure along the floor from one wall to the opposite wall.

Tools needed: Tape measure

The width of the room.

Measure perpendicular to the length.

Tools needed: Tape measure

Doorway openings don't need baseboard.

Each standard doorway opening is assumed to be about 3 ft (0.9 m) wide.

The length trim is sold in at your supplier.

Longer is usually better here, because every joint in a run is a scarf that will open slightly as the timber moves and a wall with no joint in it never does. Skirting is forgiving about handling — it is cut and fitted at floor level, so length is limited by the doorways and the stairwell it has to come through rather than by what two people can hold up. Measure the longest straight wall first: if a single stick covers it, the run has no joint in it at all.

Extra trim for mitres, coped joints and the odd bad cut.

Taken against the whole run, so it grows with the length of skirting rather than with the number of corners. Ten suits a plain room with four corners; a bay, a chimney breast or a run of short returns turns more of each stick into offcuts that fit nowhere, and fifteen is the safer figure there.

Estimated baseboard & trim needed

50.65 linear ft

High confidence
Room perimeter (minus doorways)
46.05 linear ft
Sticks needed
7 x 8 ft sticks
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Room perimeter = 2 x (length + width) for a rectangular room; trim is commonly stocked in 8, 10, 12, 14, and 16 ft sticks in North America, and in the 2.4, 3, 3.6, 4.2 and 4.8 m lengths metric merchants run, moulding there stepping by 300 mm
  • 10-15% waste is standard to account for cuts, corners (mitered at 45°), and mistakes

Inputs used

Measure the Room As
A rectangle (length and width)
Measured Perimeter
49 ft
Room Length
13 ft
Room Width
11.5 ft
Number of Doorways
1
Stock Stick Length
8 ft
Cutting Waste (%)
10

Intermediate steps

Room perimeter (minus doorways)
46.05 linear ft
Sticks needed
7 x 8 ft sticks
Final result50.65 linear ft

What this calculation does not cover

  • As a rectangle, the run is 2 x (length + width), four straight walls and square corners; an alcove, a chimney breast, a bay, an L-shaped plan or a return wall all change the length of skirting, so measure such a room wall by wall and give the total as a perimeter.
  • Every doorway is deducted at a flat 0.9 m (3 ft) no matter what it measures, so a double door, a wide cased opening or a patio slider is under-deducted while a 760 mm (30 in) single door is over-deducted, and the architrave is not in the deduction at all — skirting dies into the casing, so the real gap at each opening is the opening plus the width of two casings.
  • Waste is taken as a percentage of the whole run rather than against the number of cuts, so at the same setting a small room with eight mitred or coped corners loses proportionally more off the ends than one long wall does; the sources quote 10-15%, and a room like that belongs at the top of the band.
  • The stick figure is one division — run with waste over a single stock length, rounded up — which is a quantity rather than a cut list: it assumes any wall longer than a stick will be scarf-jointed and that an offcut left on one wall can be carried to the next. Count wall by wall instead if you want the joint-free runs the stock-length note argues for, since a 4.6 m wall swallows two 2.4 m lengths and leaves 200 mm that fits nowhere.
  • Nothing about the profile reaches the numbers — height, thickness, material and whether the base is a single section or a base with a separate shoe or cap moulding are all outside it, and a two-piece base means ordering this same perimeter twice in two sections. Fasteners, adhesive, filler, caulk and paint are not counted either, no price is attached to either figure, and each side is capped at 30 m, so a whole-floor take-off has to be broken into rooms.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Schematic layout — positions are illustrative, quantities are exact. This calculator is told how many doors and windows there are, never where they sit or how big each one is, so they are drawn evenly spaced at the standard allowance it deducts. Moving one would change nothing in the numbers above.

Plan of Room, 13′ by 11′ 6″, with 1 passage(s), positions shown schematically.13′11′ 6″1′

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.

Or plan the space itself: measure it once, doors and windows included, and this figure comes back worked out on that space, with what goes with it.

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 2026-09-17 · v1.1.0

Regulatory standards & verification citations2
  1. Room perimeter = 2 x (length + width) for a rectangular room; trim is commonly stocked in 8, 10, 12, 14, and 16 ft sticks in North America, and in the 2.4, 3, 3.6, 4.2 and 4.8 m lengths metric merchants run, moulding there stepping by 300 mm
  2. 10-15% waste is standard to account for cuts, corners (mitered at 45°), and mistakes
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 fix skirting and trim. Generic types, no brands, no prices.

Protection this work requires

  • Hardwood dust is a recognised carcinogen: extract at the tool and wear a P2/N95 respirator when cutting or sanding indoors.
  • Saws, grinders and breakers run above 85 dB, where hearing damage accumulates and does not recover: defenders or plugs for every cut, not just the long ones.
  • Nailing, chiselling and cutting all throw fragments: glasses to EN 166 or ANSI Z87.1, and goggles rather than glasses overhead.
Show the 6 tools this job needs

Essential

  • Claw hammer

  • Combination or framing square

  • Mitre saw

Recommended

  • Brad or finish nailer

  • Caulking gun

  • Filling knife

Also needed as materials: brad nails, caulk and sealant cartridges, mitre saw blades.

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

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

  • Fitting Skirting and Architraveuses this calculator

    No corner is square, so the joints carry the job: where to scribe, where to mitre, and how to hold one margin round every door lining in the house.

  • Heating a Room With Electric Baseboarduses this calculator

    Electric baseboard turns a room's heat load into a length of free wall, and under a basement window that wall runs out before the wattage does.

  • Painting Woodwork and Trimuses this calculator

    Why a white gloss goes ivory behind the door, what a live knot does to a waterborne film, and how a metre of moulding becomes a square metre of paint.

Called something else where you work? Skirting board / baseboard · Architrave and casing · Dado rail and chair rail · Plinth and toe kick — the term in each market, how close the equivalence really is, and the standard that governs it.

Worked examples: Vinyl plank floor — step 7 of 7 · Stud partition with a door — step 10 of 10

Already gone wrong? A door sticks, binds or will not close properly · The joints in my skirting, architrave or coving have opened up

The data behind it: Production rates by operation

How to calculate baseboard & trim in 8 steps

  1. Measure the Room AsA rectangle's two sides, or the run of wall you measured round an L-shape, a bay or an alcove.
  2. Measured PerimeterThe total run along the base of the walls, doorways included.
  3. Room LengthThe length of the room.
  4. Room WidthThe width of the room.
  5. Number of DoorwaysDoorway openings don't need baseboard.
  6. Stock Stick LengthThe length trim is sold in at your supplier.
  7. Cutting Waste (%)Extra trim for mitres, coped joints and the odd bad cut.
  8. Read the resultThe tool computes the result from those figures and shows the formula, its sources, and a confidence rating alongside it.

Frequently asked questions

Why subtract doorways but not windows?
Baseboard runs along the floor, so only floor-level openings like doorways interrupt it — windows are up on the wall and don't affect baseboard length.
Should I buy exactly this many sticks?
Round up, which this calculator already does — leftover trim is useful for patch repairs later, and running short mid-project means an extra supply trip.
Does corner mitering waste extra material?
The 10% default covers standard 45° corner miters. Rooms with unusual angles or many short returns need a higher cutting waste, which you can set on this page.
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.